APS-FC-000(1), Rev. A

Dwg. No. APS-FC-000(1) / APS Start-up Flow Chart Drawing List

APS SU FC Drawing List

APS-FC-000(1), Rev. A :

APS-FC-000(2), Rev. A :

APS-FC-001, Rev. A :

Drawing List

Remakrs

HRSG1 & 2 Start-up Mode Selection

APS-FC-002, Rev. A :

APS-FC-003, Rev. A :

APS-FC-004, Rev. A :

APS-FC-104, Rev. A :

APS-FC-006, Rev. A :

APS-FC-106, Rev. A :

APS-FC-008, Rev. A :

APS-FC-108, Rev. A :

APS-FC-009, Rev. A :

APS-FC-109, Rev. A :

APS-FC-010, Rev. A :

APS-FC-110, Rev. A :

APS-FC-011, Rev. A :

APS-FC-111, Rev. A :

APS-FC-012, Rev. A :

APS-FC-112, Rev. A :

APS-FC-013, Rev. A :

APS-FC-113, Rev. A :

APS-FC-014, Rev. A :

APS-FC-114, Rev. A :

APS-FC-015, Rev. A :

APS-FC-016, Rev. A :

Target Load Input & ST Start-up Mode Selection

GT(+ HRSG) SU Order Selection

HRSG1 Start-up Preparation

HRSG2 Start-up Preparation (Same with HRSG1)

HRSG1 Piping Drain Operation

HRSG2 Piping Drain Operation (Same with HRSG1)

HRSG1 Start-up Preparation, GT1 Start-up and Synchronization

HRSG2 Start-up Preparation, GT2 Start-up and Synchronization (Same with HRSG1 & GT1)

HRSG1 Temp Matching, Bypass Valve Set-up, Isolation Valve Open

HRSG2 Temp Matching, Bypass Valve Set-up, Isolation Valve Open (Same with HRSG1)

ST Piping Drain Operation by LEAD HRSG1

ST Piping Drain Operation by LEAD HRSG2 (Same with HRSG1)

ST Start-up by LEAD HRSG1

ST Start-up by LEAD HRSG2 (Same with HRSG1)

LEAD GT1 Ramp-up to 50% Load(100 MW)

LEAD GT2 Ramp-up to 50% Load(100 MW) (Same with GT1)

LEAD & LAG HRSG1 LP Addition to ST

LEAD & LAG HRSG2 LP Addition to ST (Same with HRSG1)

LAG HRSG1 HP Addition to ST

LAG HRSG2 HP Addition to ST (Same with HRSG1)

Both GT s Ramp-up to Target Load

APS SU Start & End

Dwg. No. Title

ENGS

OFT

APS-FC-000(2), Rev. A

Dwg. No. APS-FC-000(2) / Remarks

1. Abbreviation :

APS : Automatic Plant Start-up and Shut-downST : Steam TurbineGT : Gas TurbineST TCS : Steam Turbine Control SystemGT TCP : Gas Turbine Control PanelHP : High PressureCRH : Cold ReheatHRH : Hot ReheatCMV : Combined Main Valve (at ST HP Inlet)CRV : Combined Reheat Valve (at ST HRH Inlet)CB : Command Button with OK and Cancel ConfirmationSLLoad : Spinning Reserve Load (of GT)

2. Expression in Flow Charts :

Commands are written in capital letters. For example, XV1007 AUTO/OPEN stands for transferring to AUTO mode and then OPEN XV1007, whereas AUTO/(Open) stands for transferring to AUTO mode that results in opening of XV1007.

4. HP/HRH Steam Temperature Settings :

HRSG Attemperator Control(1) : 560 oC GT Runback to Rated Temp : > 578.5 oCGT Runback to FSNL AND ST Trip : > 583 oC

5. HRSG LP Econ Bypass Valve :

HRSG LP steam system has no bypass valve dumping to condenser. Instead, HRSG LP Economizer bypass valve controls LP steam generation in start-up, shut-down and trip cases.

3. CAS/AUTO/MANUAL :

CAS : Operated by loop/logic where set value is given by loop/logic itself.AUTO : Operated by loop/logic, where set value is input by Operator.MANUAL : Operated by opening value that is input by Operator.

6. HRSG Start-up Vent Valve Operation :

In APS-FC-011 and 013, operation of HP and LP start-up vent valves is mentioned. Even though start-up vent valve operation is not mentioned in other flow charts, start-up vent valves are operated principally as below:

When following conditions are satisfied in relevant steam system, the start-up vent valve of relevant steam system opens to its 10% position.- GT is fired, AND- Steam pressure is higher than 0.7 kg/cm2g, AND- Isolation valve is not fully open, AND- Bypass valve is not operating. (in case of LP, LP Econ Bypass Valve)

When following conditions are satisfied in relevant steam system, the start-up vent valve of relevant steam system closes full.- GT is shut down, OR- Steam pressure is lower than 0.7 kg/cm2g.

When relevant drum temperature change rate exceeds limit value, relevant start-up vent valve opens mitigate the change rate. Start-up vent valves shall react later than bypass valve or steam turbine.

When start-up vent valve closes, its set value of open is set at a pressure higher than the maximum pressure set value of relevant bypass valve, but lower than relevant safety valve, so that, when over pressure occurs in relevant steam system, bypass valve opens firstly, then start-up vent valve opens, and lastly safety valve opens.

: Input, Output, Display

: Program Start / End

: Decision

: Input, Switch, Push Button

: Process

: Manual Operation

: Other Module / Process

< Symbol >

ENGS

OFT

HRSG1 SU Mode Selection Start

HRSG1 HP Steam Pr. < 3.51 atg

HRSG1 HP COLD

HRSG1 HP Steam Pr. < 63.8 atg

No

HRSG1 HP WARM

HRSG1 HP HOT

No

HRSG1 SU Mode Selection End

HRSG1 IP Steam Pr. < 0.7 atg

HRSG1 IP COLDYes

HRSG1 IP Steam Pr. < 7.67 atg

No

HRSG1 IP WARM

No

HRSG1 IP HOT

Yes

Yes

Yes

HRSG1 LP Steam Pr. < 0.7 atg

HRSG1 LP COLD

HRSG1 LP Steam Pr. < 3.51 atg

No

HRSG1 LP WARM

HRSG1 LP HOT

No

Yes

Yes

HRSG1 Start-up Mode Selection

IPHPLP

Dwg. No. APS-FC-001, Rev. A

Dwg. No. APS-FC-001 / HRSG1 & 2 Start-up Mode Selection

HRSG2 Start-up Mode Selection (Same with HRSG1)

HRSG2 SU Mode Selection Start

HRSG2 HP Steam Pr. < 3.51 atg

HRSG2 HP COLD

HRSG2 HP Steam Pr. < 63.8 atg

No

HRSG2 HP WARM

HRSG2 HP HOT

No

HRSG2 SU Mode Selection End

HRSG2 IP Steam Pr. < 0.7 atg

HRSG2 IP COLDYes

HRSG2 IP Steam Pr. < 7.67 atg

No

HRSG2 IP WARM

No

HRSG2 IP HOT

Yes

Yes

Yes

HRSG2 LP Steam Pr. < 0.7 atg

HRSG2 LP COLD

HRSG2 LP Steam Pr. < 3.51 atg

No

HRSG2 LP WARM

HRSG2 LP HOT

No

Yes

Yes

IPHPLP ENGS

OFT

Dwg. No. APS-FC-002, Rev. A

Dwg. No. APS-FC-002 / Target Load Input & ST Start-up Mode Selection

ST SU Mode Selection

Start

ST Metal Temp < 250 oC

ST COLD

ST Metal Temp < 370 oCNo

ST WARM

ST VERY HOT

NoST SU Mode

SelectionEnd

YesYes

ST Metal Temp < 520 oC

No

ST HOT

Yes

Note 1ST metal temperature is selected as the lower value of HP turbine first stage inner surface metal temperature and IP turbine bowl inner surface metal temperature.

Note 2ST start-up mode selection shall be performed by ST TCS and informed to DCS.

ST Metal Temp < 150 oC

ST AMBIENT

COLD

Yes

No

Target Load Input Start

BASE LOADTARGET (CB)

CCPP OUTPUTTARGET (CB)

Change AGC Target CCPP OUTPUT to This APS CCPP OUTPUT VALUE

CCPP OUTPUTTARGET VALUEInput by Operator(Input Textbox)

CCPP OUTPUT TARGET

BASE LOAD TARGET

After Both GT’s reach their 50% load(100 MW) by APS, ramp-up to target CCPP output shall be

performed by Automatic Generation Control(AGC).

Target Load Input End

Target Load Input

ST Start-up Mode SelectionENGS

OFT

Dwg. No. APS-FC-003, Rev. A

Dwg. No. APS-FC-003 / GT(+ HRSG) SU Order Selection

Train SU Order Selection Start

GT1 LEAD(CB)

GT1 LEAD

No

GT1 LAG(CB)

GT1 LAG

No

Yes

GT1 IDLE/RUN(CB)

GT1 IDLE/RUN

Yes(N/A)

Yes(N/A)

Train SU Order Selection End

GT2 LEAD GT2 LAG

GT2 LEAD(CB)

GT2 LEAD

No

GT2 LAG(CB)

GT2 LAG

No

Yes

GT2 IDLE/RUN(CB)

GT2 IDLE/RUN

Yes(N/A)

Yes(N/A)

GT1 LEAD GT1 LAG

ENGS

OFT

APS-FC-004, Rev. A

Dwg. No. APS-FC-004 / HRSG1 Start-up Preparation

HRSG1 Start-up Preparation Start

GT1 LEAD

HRSG2 Isolation :

HRSG2 HP Isolation Valve CLOSEHRSG2 HP Isolation Bypass Valve CLOSEHRSG2 HRH Isolation Valve CLOSEHRSG2 CRH Isolation Valve CLOSEHRSG2 CRH Isolation Bypass Valve CLOSEHRSG2 LP Isolation Valve CLOSEHRSG2 LP Isolation Bypass Valve CLOSE

HRSG2 Isolation Completed

Yes

No(Wait)

HRSG1 Isolation :

HRSG1 HP Isolation Valve CLOSEHRSG1 HP Isolation Bypass Valve CLOSEHRSG1 HRH Isolation Valve CLOSEHRSG1 CRH Isolation Valve CLOSEHRSG1 CRH Isolation Bypass Valve CLOSEHRSG1 LP Isolation Valve CLOSEHRSG1 LP Isolation Bypass Valve CLOSE

Yes

HRSG1 Isolation Completed

No(Wait)

No(GT1 LAG or IDLE/RUN)

GT1 IDLE/RUN

Yes

Yes(GT1 IDLE)

HRSG Isolation is required even if GT SU ORDER is LEAD, because HRSG isolation is required for GT

RESET for start-up.If HRSG isolation is not the

condition of GT RESET, this step is not required.

HRSG1 MOV Set-up :

HP/IP/LP Feedwater Isolation Valve OPENHP/IP/LP Feedwater Vent Valve CLOSEHP/IP/LP Drum CBD Valve CLOSEHP/IP/LP Drum IBD Valve CLOSEHP/IP/LP Drum CBD Vent Valve CLOSEHP/IP/LP Drum Vent Valve CLOSEHP/IP/LP Econ Vent Valve CLOSEHP/IP/LP Superheater Vent Valve CLOSEHP/RH DSH Vent Valve CLOSEHP/RH DSH Spray Water Valve CLOSEHP/IP/LP Sparging Steam Valve CLOSEIP Isolation Valve OPENStack Damper OPEN

No(GT1 LEAD or LAG)

HRSG1 MOV Set-up Completed

No(Wait)

HRSG1 Auto Control ON according to Manufacturer’s Loop Logic :

HP/IP Drum IBD Valves AUTOHP/IP/LP Superheater Drain Valves AUTOReheater Drain Valves AUTOHP/RH/IP/LP Start-up Vent Valves AUTOHP/IP/LP Feedwater Control Valves AUTOHP/RH Spray Water Control Valves AUTOHRH Bypass Valve Preheat Valve AUTOLP Econ Recirculation Control AUTOLP Econ Recirculation Pumps AUTO/START

HRSG1 BOP System in SERVICE :

Condensate System in SERVICE by- CEP A or B RUN- CEP Discharge Press > 20.5 atg

CW System in SERVICE by- CWP A or B RUN

HRSG1 BFP System in SERVICE by- BFP RUN

Chemical Dosing System in SERVICE by- Operator Confirmation

HRSG1 BOP System in SERVICE

Yes

Yes

No(Wait)

HRSG1 AUTO Control ON

No(Wait)

HRSG1 Drums in Start-up Level :

HP Drum Level < (-) 250 mmIP Drum Level < (-) 250 mmLP Drum Level < (-) 250 mm

Yes

HRSG1 Start-up Preparation End

HRSG1 Drums Start-up Level OK

No(Wait)

Yes

GT1 LAG

Yes(GT1 LAG)

GT1 Synchronized

No(GT1 IDLE/RUN)

No(GT1 IDLE)

Yes(GT1 RUN)

ENGS

OFT

APS-FC-104, Rev. A

Dwg. No. APS-FC-104 / HRSG2 Start-up Preparation (Same with HRSG1)

HRSG2 Start-up Preparation Start

GT2 LEAD

HRSG1 Isolation :

HRSG1 HP Isolation Valve CLOSEHRSG1 HP Isolation Bypass Valve CLOSEHRSG1 HRH Isolation Valve CLOSEHRSG1 CRH Isolation Valve CLOSEHRSG1 CRH Isolation Bypass Valve CLOSEHRSG1 LP Isolation Valve CLOSEHRSG LP Isolation Bypass Valve CLOSE

HRSG1 Isolation Completed

Yes

No(Wait)

HRSG2 Isolation :

HRSG2 HP Isolation Valve CLOSEHRSG2 HP Isolation Bypass Valve CLOSEHRSG2 HRH Isolation Valve CLOSEHRSG2 CRH Isolation Valve CLOSEHRSG2 CRH Isolation Bypass Valve CLOSEHRSG2 LP Isolation Valve CLOSEHRSG2 LP Isolation Bypass Valve CLOSE

Yes

HRSG2 Isolation Completed

No(Wait)

No(GT2 LAG or IDLE/RUN)

GT2 IDLE/RUN

Yes

Yes(GT2 IDLE)

HRSG2 MOV Set-up :

HP/IP/LP Feedwater Isolation Valve OPENHP/IP/LP Feedwater Vent Valve CLOSEHP/IP/LP Drum CBD Valve CLOSEHP/IP/LP Drum IBD Valve CLOSEHP/IP/LP Drum CBD Vent Valve CLOSEHP/IP/LP Drum Vent Valve CLOSEHP/IP/LP Econ Vent Valve CLOSEHP/IP/LP Superheater Vent Valve CLOSEHP/RH DSH Vent Valve CLOSEHP/RH DSH Spray Water Valve CLOSEHP/IP/LP Sparging Steam Valve CLOSEIP Isolation Valve OPENStack Damper OPEN

No(GT2 LEAD or LAG)

HRSG2 MOV Set-up Completed

No(Wait)

HRSG2 Auto Control ON according to Manufacturer’s Loop Logic :

HP/IP Drum IBD Valves AUTOHP/IP/LP Superheater Drain Valves AUTOReheater Drain Valves AUTOHP/RH/IP/LP Start-up Vent Valves AUTOHP/IP/LP Feedwater Control Valves AUTOHP/RH Spray Water Control Valves AUTOHRH Bypass Valve Preheat Valve AUTOLP Econ Recirculation Control AUTOLP Econ Recirculation Pumps AUTO/START

HRSG2 BOP System in SERVICE :

Condensate System in SERVICE by- CEP A or B RUN- CEP Discharge Press > 20.5 atg

CW System in SERVICE by- CWP A or B RUN

HRSG2 BFP System in SERVICE by- BFP RUN

Chemical Dosing System in SERVICE by- Operator Confirmation

HRSG2 BOP System in SERVICE

Yes

Yes

No(Wait)

HRSG2 AUTO Control ON

No(Wait)

HRSG2 Drums in Start-up Level :

HP Drum Level < (-) 250 mmIP Drum Level < (-) 250 mmLP Drum Level < (-) 250 mm

Yes

HRSG2 Start-up Preparation End

HRSG2 Drums Start-up Level OK

No(Wait)

Yes

GT2 LAG

Yes(GT2 LAG)

GT2 Running

No(GT2 IDLE/RUN)

No(GT2 IDLE)

Yes(GT1 RUN)

HRSG Isolation is required even if GT SU ORDER is LEAD, because HRSG isolation is required for GT

RESET for start-up.If HRSG isolation is not the

condition of GT RESET, this step is not required.

ENGS

OFT

APS-FC-006, Rev. A

Dwg. No. APS-FC-006 / HRSG1 Piping Drain Operation

Block AUTO operation and then open drain valves (See Note 1):

XV1005 MANUAL/OPENXV1006 MANUAL/OPEN

Note 1 :XV1005 : Auto drain valve between HP stop/check valve and HP isolation MOVXV1006 : Auto drain valve just upstream of HP isolation MOV

HRSG1 HPPr > 0.7 atg

No (Wait)

Yes

TI1005 > 427 oC ORHRSG1 HP Iso Vv Full Open

No (Wait)

Put drain valves in AUTO operation :

XV1005 AUTO/(Close)

Yes

Put drain valves in AUTO operation :

XV1006 AUTO/(Close)

HR

SG

1 H

P Is

olat

ion

Val

ve F

ull O

pen

Note 4 :APS logic of HRSG superheater & reheater drain valves shall be same with that of XV1005 / XV1016 / XV1019.

Block AUTO operation and then open drain valves (See Note 2.):

XV1016 MANUAL/OPENXV1017 MANUAL/OPENXV1033 MANUAL/OPEN

HRSG1 HRHPr > 0.7 atg

No (Wait)

Yes

TI1014 > 427 oC ORHRSG1 HRH Iso Vv Full Open

No (Wait)

Put drain valves in AUTO operation :

XV1016 AUTO/(Close)XV1033 AUTO/(Close)

YesHR

SG

1 H

RH

Isol

atio

nV

alve

Ful

l Ope

n

Note 2 :XV1016 : Auto drain valve in HRH bypass valve branch pipingXV1033 : Auto drain valve in CRH piping

(XV1033 is open or lose by drain pot level)XV1017 : Auto drain valve just upstream of HRH isolation MOV

Block AUTO operation and then open drain valves (See Note 3.):

XV1019 MANUAL/OPENXV1020 MANUAL/OPEN

HRSG1 LPPr > 0.7 atg

No (Wait)

Yes

(GT1 Output > 10 MW)

5 min. elapsed ORHRSG1 LP Iso Vv Full Open

No (Wait)

Put drain valves in AUTO operation :

XV1019 AUTO/(Close)

Yes

Put drain valves in AUTO operation :

XV1020 AUTO/(Close)

HR

SG1

LP Is

olat

ion

Val

ve F

ull O

pen

Note 3 :XV1019 : Auto drain valve upstream of LP stop/check valveXV1020 : Auto drain valve between LP stop/check valve and LP isolation MOV

General (See Note 4.)

A(008, B)

C(010, C)

B(010, D)

D(010, E)TI1006 > 427 oC OR

HRSG1 HP Iso Valve Full Open

Yes

No(Wait)

Put drain valves in AUTO operation :

XV1017 AUTO/(Close)

TI1015 > 427 oC ORHRSG1 HRH Iso Vv Full Open

No (Wait)

Yes

HRSG1 LP Iso Vv Full Open

Yes

No (Wait)

Note 5 :427 oC, has been selected for protection of the drain tank made of carbon steel.

ENGS

OFT

APS-FC-106, Rev. A

Dwg. No. APS-FC-106 / HRSG2 Piping Drain Operation (Same with HRSG1)

Block AUTO operation and then open drain valves (See Note 1):

XV2005 MANUAL/OPENXV2006 MANUAL/OPEN

Note 1 :XV2005 : Auto drain valve between HP stop/check valve and HP isolation MOVXV2006 : Auto drain valve just upstream of HP isolation MOV

HRSG2 HPPr > 0.7 atg

No (Wait)

Yes

TI2005 > 427 oC ORHRSG2 HP Iso Vv Full Open

No (Wait)

Put drain valves in AUTO operation :

XV1005 AUTO/(Close)

Yes

Put drain valves in AUTO operation :

XV2006 AUTO/(Close)

HR

SG

2 H

P Is

olat

ion

Val

ve F

ull O

pen

Note 4 :APS logic of HRSG superheater & reheater drain valves shall be same with that of XV2005 / XV2016 / XV2019.

Block AUTO operation and then open drain valves (See Note 2.):

XV2016 MANUAL/OPENXV2017 MANUAL/OPENXV2033 MANUAL/OPEN

HRSG2 HRHPr > 0.7 atg

No (Wait)

Yes

TI2014 > 427 oC ORHRSG2 HRH Iso Vv Full Open

No (Wait)

Put drain valves in AUTO operation :

XV2016 AUTO/(Close)XV2033 AUTO/(Close)

YesHR

SG

2 H

RH

Isol

atio

nV

alve

Ful

l Ope

n

Note 2 :XV2016 : Auto drain valve in HRH bypass valve branch pipingXV2033 : Auto drain valve in CRH piping

(XV2033 is open or lose by drain pot level)XV2017 : Auto drain valve just upstream of HRH isolation MOV

Block AUTO operation and then open drain valves (See Note 3.):

XV2019 MANUAL/OPENXV2020 MANUAL/OPEN

HRSG2 LPPr > 0.7 atg

No (Wait)

Yes

(GT2 Output > 10 MW)

5 min. elapsed ORHRSG2 LP Iso Vv Full Open

No (Wait)

Put drain valves in AUTO operation :

XV2019 AUTO/(Close)

Yes

Put drain valves in AUTO operation :

XV2020 AUTO/(Close)

HR

SG

2 LP

Isol

atio

nV

alve

Ful

l Ope

n

Note 3 :XV2019 : Auto drain valve upstream of LP stop/check valveXV2020 : Auto drain valve between LP stop/check valve and LP isolation MOV

General (See Note 4.)

A(108, B)

C(110, C)

B(110, D)

D(110, E)TI2006 > 427 oC OR

HRSG2 HP Iso Valve Full Open

Yes

No(Wait)

Put drain valves in AUTO operation :

XV2017 AUTO/(Close)

TI2015 > 427 oC ORHRSG2 HRH Iso Vv Full Open

No (Wait)

Yes

HRSG2 LP Iso Vv Full Open

Yes

No (Wait)

Note 5 :427 oC, has been selected for protection of the drain tank made of carbon steel.

ENGS

OFT

APS-FC-008, Rev. A

Dwg. No. APS-FC-008 / HRSG1 Start-up Preparation, GT1 Start-up and Synchronization

HRSG1 Isolation Bypass Valve Open for Piping Warm-up :

HP Isolation Bypass Valve OPENCRH Isolation Bypass Valve OPENLP Isolation Bypass Valve OPEN

GT1 LEAD OR GT1 IDLE/RUN

HRSG1 Start-up Preparation(APS-FC-004)

APS SU Start

Yes

GT2 SynchronizedNo(GT1 LAG)

Yes

No (Wait)

HRSG1 HP/HRH/LP Bypass Valve Preparation :

HP Bypass Valve Quick Close RESETHP Bypass Valve MANUAL/CLOSEHP Bypass Spray Isolation Valve AUTO/(Close)HP Bypass Spray Control Valve MANUAL/CLOSEHRH Bypass Valve Quick Close RESETHRH Bypass Valve MANUAL/CLOSEHRH Bypass Spray Isolation Valve AUTO/(Close)HRH Bypass Spray Control Valve MANUAL/CLOSELP Econ Bypass Valve CAS / (Set at 2.0 atg)

GT1 RESET for Trip and Runback

GT1 RESETCompleted No

Clear GT1 Trip or Runback Conditions

(by Operator)

GT1 Fuel Gas System Preparation :

Fuel Gas Supply Header Valve AUTO/OPENFuel Gas Supply Header Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Valves AUTO/OPENIP Feedwater Return Vent Valve AUTO/CLOSEIP Feedwater Return Valves AUTO/OPENFuel Gas Temp Control Valve CAS/(10% Open)

Yes

GT1 START(CB)

Send “CUSTOMER PERMISSIVE TO START” signal to GT1 TCP

GT1 “READY TO START”signal from GT1 TCP

Received

Turn on GT1 “REMOTE” at GT1 TCP

(by Operator)

No (Wait)

Yes

GT1 Ready for Synchronization at GT1

TCP

Send GT1 “START” signal to GT1 TCP

No (Wait)

GT1 Automatic Generation Control MANUAL

GT1 GCB “AUTO SYNCHRO” Selected

No

MANUAL SYNCHRO at GT1 TCP

(by Operator)

Yes

GT1 Synchronized and loaded to SRLoad by GT1 TCP

Yes

A(009, A)Yes

GT1 Output > 10 MW

No (Wait)

B(006, A)Yes

GT1 TCP “REMOTE” Selected

No

Yes

GT1 Start

GT1 Synchronized

GT1 Ready to StartYes

C(016, A)

GT1 IDLE/RUN

No

D(016, G)

Yes(APS SU End)

Early opening of isolation bypass valves is better for

piping warming-up, especially in case of LAG start-up of HRSG2 located

far from ST.

For making APS control GT1

ENGS

OFT

APS-FC-108, Rev. A

Dwg. No. APS-FC-108 / HRSG2 Start-up Preparation, GT2 Start-up and Synchronization (Same with HRSG1 & GT1)

HRSG2 Isolation Bypass Valve Open for Piping Warm-up :

HP Isolation Bypass Valve OPENCRH Isolation Bypass Valve OPENLP Isolation Bypass Valve OPEN

GT2 LEAD OR GT2 IDLE/RUN

HRSG2 Start-up Preparation(APS-FC-104)

APS SU Start

Yes

GT1 SynchronizedNo(GT2 LAG)

Yes

No (Wait)

HRSG2 HP/HRH/LP Bypass Valve Preparation :

HP Bypass Valve Quick Close RESETHP Bypass Valve MANUAL/CLOSEHP Bypass Spray Isolation Valve AUTO/(Close)HP Bypass Spray Control Valve MANUAL/CLOSEHRH Bypass Valve Quick Close RESETHRH Bypass Valve MANUAL/CLOSEHRH Bypass Spray Isolation Valve AUTO/(Close)HRH Bypass Spray Control Valve MANUAL/CLOSELP Econ Bypass Valve CAS / (Set at 2.0 atg)

GT2 RESET for Trip and Runback

GT2 RESETCompleted No

Clear GT2 Trip or Runback Conditions

(by Operator)

GT2 Fuel Gas System Preparation :

Fuel Gas Supply Header Valve AUTO/OPENFuel Gas Supply Header Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Valves AUTO/OPENIP Feedwater Return Vent Valve AUTO/CLOSEIP Feedwater Return Valves AUTO/OPENFuel Gas Temp Control Valve CAS/(10% Open)

Yes

GT2 START(CB)

Send “CUSTOMER PERMISSIVE TO START” signal to GT2 TCP

GT2 “READY TO START”signal from GT2 TCP

Received

Turn on GT2 “REMOTE” at GT2 TCP

(by Operator)

No (Wait)

Yes

GT2 Ready for Synchronization at GT2

TCP

Send GT2 “START” signal to GT2 TCP

No (Wait)

GT2 Automatic Generation Control MANUAL

GT2 GCB “AUTO SYNCHRO” Selected

No

MANUAL SYNCHRO at GT2 TCP

(by Operator)

Yes

GT2 Synchronized and loaded to SRLoad by GT2 TCP

Yes

A(009, A)Yes

GT2 Output > 10 MW

No (Wait)

B(006, A)Yes

GT2 TCP “REMOTE” Selected

No

Yes

GT2 Start

GT2 Synchronized

GT2 Ready to StartYes

C(016, B)

GT2 IDLE/RUN

No

D(016, H)

Yes(APS SU End)

Early opening of isolation bypass valves is better for

piping warming-up, especially in case of LAG start-up of HRSG2 located

far from ST.

For making APS control GT1

ENGS

OFT

A(008, A)

APS-FC-009, Rev. A

Dwg. No. APS-FC-009 / HRSG1 Temp Matching, Bypass Valve Set-up, Isolation Valve Open

< Temperature Matching for HRSG1 >Send the following signal to GT1 TCP :

“EXHAUST TEMP MATCH REFERENCE = 400 oC“EXHAUST TEMP MATCH RAMP RATE” = 1.1 oC/min.(Max.)EXHAUST TEMP MATCH CONTROL ON

Gt1 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG1 HP Drum Press > 0.7 atg

No (Wait)

Yes

Put HRSG1 HP Bypass Valve into CAS Control as follows :

HP Bypass Valve MANUAL/OPEN to 10% Opening

HP Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 50 atg (10% Minimum Opening) not to exceed the following limit

- HP Drum Temp Change Rate < 3.9 oC/min.- (-) 50 mm > HP Drum Level > (-) 350 mm

HP Bypass Valve CAS/(Set at 50 atg)

HRSG1 HP Press > 30 atg ANDHRSG1 HP Bypass Valve Opening > 9%

Put HRSG1 HP Bypass Spray Valve into CAS Control as follows :

HP Bypass Spray Isolation Valve AUTO/OPEN HP Bypass Spray Valve CAS/(Set at 360 oC)(See Note 2.)

Yes

No (Wait)

Gt1 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG1 HRH Press > 0.7 atg ANDHRSG1 HRH Bypass Valve Body Temp O.K. (> CRH Sat. Temp)

No (Wait)

Yes

Put HRSG1 HRH Bypass Valve into CAS Control as follows :

HRH Bypass Valve MANUAL/OPEN to 10% Opening

HRH Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 6.5 atg (10% Minimum Opening) not to exceed the following limit

- IP Drum Temp Change Rate < 10 oC/min.- (-) 50 mm > IP Drum Level > (-) 350 mm

HRH Bypass Valve CAS/(Set at 6.5 atg)

HRSG1 HRH Press > 6 atg ANDHRSG1 HRH Bypass Valve Opening > 13%

Put HRSG1 HRH Bypass Spray Valve into CAS Control as follows :

HRH Bypass Spray Isolation Valve AUTO/OPEN HRH Bypass Spray Valve CAS/(675 kcal/kg Enthalpy Control) (See Note 3.)

Yes

Yes

No (Wait)

HRSG1 HRH Press> 0.7 atg

GT1 Output > 10 MW

GT1 LEAD

Yes

Open HRSG1 isolation valves in the following order :

HRH Isolation Valve AUTO/OPENCRH Isolation Valve AUTO/OPENHP Isolation Valve AUTO/OPEN

Close HRSG1 isolation bypass valves as follows :

CRH Isolation Bypass Valve AUTO/CLOSE on CRH Isolation Valve CloseHP Isolation Bypass Valve AUTO/CLOSE on HP Isolation Valve Close

Yes

HRSG1 LP Drum Press> 0.7 atg

HRSG1 LP Isolation valve AUTO/OPEN

HRSG1 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close

Yes

Yes

Condition for minimum volume flow of effective

spray, 0.72 m3/hr(See Note 1.)

Condition for minimum volume flow of effective

spray, 2.8 m3/hr(See Note 1.)

No(GT1 LAG)

B(010, A)

ST HP/CRH/HRHPiping Drain

C(010, B)

No (Wait) No (Wait)

Note 1 :The condition has been calculated based on nozzle flow equation.

Note 2 :The higher the cold reheat temperature is, the better the HP steam control is in view of HP steam high temperature problem.

Note 3 :The enthalpy has been selected considering condenser dome spray water flow.

E(011, A)

Reheat FlowEstablishment

F(011, B)

Reheat FlowEstablishment

G(011, C)

ST Start-upPermissive

H(011, D)

Reheat FlowEstablishment

Put HRSG1 LP Econ Bypass Valve CAS/SET at 4.0 kg/cm2g

HRSG1 LP Drum Press> 0.7 atg

Yes

No(Wait)

I(013, A)

J(013, B)

Temp Match for HRSG1

HRSG1 HP Bypass Spray

CAS

HRSG1 HP Bypass CAS

HRSG1 HRH Bypass CAS

HRSG1 HRH Bypass Spray

CAS

HRSG1 LP Econ Bypass

CAS

K(011, G)

Reheat FlowEstablishment

ENGS

OFT

APS-FC-109, Rev. A

Dwg. No. APS-FC-109 / HRSG2 Temp Matching, Bypass Valve Set-up, Isolation Valve Open (Same with HRSG1)

A(108, A)

< Temperature Matching for HRSG2 >Send the following signal to GT2 TCP :

“EXHAUST TEMP MATCH REFERENCE = 400 oC“EXHAUST TEMP MATCH RAMP RATE” = 1.1 oC/min.(Max.)EXHAUST TEMP MATCH CONTROL ON

Gt2 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG2 HP Drum Press > 0.7 atg

No (Wait)

Yes

Put HRSG2 HP Bypass Valve into CAS Control as follows :

HP Bypass Valve MANUAL/OPEN to 10% Opening

HP Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 50 atg (10% Minimum Opening) not to exceed the following limit

- HP Drum Temp Change Rate < 3.9 oC/min.- (-) 50 mm > HP Drum Level > (-) 350 mm

HP Bypass Valve CAS/(Set at 50 atg)

HRSG2 HP Press > 30 atg ANDHRSG2 HP Bypass Valve Opening > 13%

Put HRSG2 HP Bypass Spray Valve into CAS Control as follows :

HP Bypass Spray Isolation Valve AUTO/OPEN HP Bypass Spray Valve CAS/(Set at 360 oC)(See Note 2.)

Yes

Yes

No (Wait)

Gt2 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG2 HRH Press > 0.7 atg ANDHRSG2 HRH Bypass Valve Body Temp O.K. (> CRH Sat. Temp)

No (Wait)

Yes

Put HRSG2 HRH Bypass Valve into CAS Control as follows :

HRH Bypass Valve MANUAL/OPEN to 10% Opening

HRH Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 6.5 atg (10% Minimum Opening) not to exceed the following limit

- IP Drum Temp Change Rate < 10 oC/min.- (-) 50 mm > IP Drum Level > (-) 350 mm

HRH Bypass Valve CAS/(Set at 6.5 atg)

HRSG2 HRH Press > 6 atg ANDHRSG2 HRH Bypass Valve Opening > 13%

Put HRSG2 HRH Bypass Spray Valve into CAS Control as follows :

HRH Bypass Spray Isolation Valve AUTO/OPEN HRH Bypass Spray Valve CAS/(675 kcal/kg Enthalpy Control) (See Note 3.)

Yes

Yes

No (Wait)

HRSG2 HRH Press> 0.7 atg

GT2 Output > 10 MW

GT2 LEAD

Yes

Open HRSG2 isolation valves in the following order :

HRH Isolation Valve AUTO/OPENCRH Isolation Valve AUTO/OPENHP Isolation Valve AUTO/OPEN

Close HRSG2 isolation bypass valves as follows :

CRH Isolation Bypass Valve AUTO/CLOSE on CRH Isolation Valve CloseHP Isolation Bypass Valve AUTO/CLOSE on HP Isolation Valve Close

Yes

HRSG2 LP Drum Press> 0.7 atg

HRSG2 LP Isolation valve AUTO/OPEN

HRSG2 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close

Yes

Yes

Condition for minimum volume flow of effective

spray, 0.72 m3/hr(See Note 1.)

Condition for minimum volume flow of effective

spray, 2.8 m3/hr(See Note 1.)

No(GT2 LAG)

B(110, A)

ST HP/CRH/HRHPiping Drain

C(110, B)

No (Wait) No (Wait)

Note 1 :The condition has been calculated based on nozzle flow equation.

Note 2 :The higher the cold reheat temperature is, the better the HP steam control is in view of HP steam high temperature problem.

Note 3 :The enthalpy has been selected considering condenser dome spray water flow.

E(111, A)

Reheat FlowEstablishment

F(111, B)

Reheat FlowEstablishment

G(111, C)

ST Start-upPermissive

H(111, D)

Reheat FlowEstablishment

Put HRSG2 LP Econ Bypass Valve CAS/SET at 4.0 kg/cm2g

HRSG2 LP Drum Press> 0.7 atg

Yes

No(Wait)

I(113, A)

J(113, B)

Temp Match for HRSG2

HRSG2 HP Bypass Spray

CAS

HRSG2 HP Bypass CAS

HRSG1 HRH Bypass CAS

HRSG2 HRH Bypass Spray

CAS

HRSG2 LP Econ Bypass

CAS

K(111, G)

Reheat FlowEstablishment

ENGS

OFT

APS-FC-010, Rev. A

Dwg. No. APS-FC-010 / ST Piping Drain Operation by LEAD HRSG1

A(009, B)

B(009, C)

HRSG1 HRH Isolation Valve Fully Open ANDHRSG1 CRH Isolation Valve Fully Open

HRSG1 HP IsolationValve Fully Open

HRSG1 LP IsolationValve Fully Open

HRSG1 HRH/CRH/HPIsolation Valves OPEN

HRSG1 LPIsolation Valve OPEN

C(006, C)

Yes(Upstream Drain

Valve AUTO)

D(006, B)

Yes(Upstream Drain

Valve AUTO)

E(006, D)

Yes(Upstream Drain

Valve AUTO)

Block AUTO operation and then open ST RH piping drain valves (See Note 2.):

XV1013 MANUAL/OPENXV1018 MANUAL/OPENXV1031 MANUAL/OPENST CRV Seat Drain Valves AUTO/OPEN

Yes

5 min. elapsed ANDCRH Press > 3.5 atg

Put drain valves in AUTO operation :

XV1013 AUTO/(Close)

Put drain valves in AUTO operation :

XV1018 AUTO/(Close)XV1031 AUTO/(Close)

ST IPCControl ON

F(012, C)

Yes

Note 1 :XV1008 : Auto drain valve(A) just upstream of ST CMVXV1009 : Auto drain valve(B) just upstream of ST CMV

Note 2 :XV1013 : Auto drain valve in ST CRH pipingXV1018 : Auto drain valve(A) just upstream of ST CRVXV1031 : Auto drain valve(B) just upstream of ST CRV

* Capacities of XV1018 and XV1031 are very important for satisfying reheat steam temperature for ST start-up within reasonable time. If not sufficient, start-up time will be long.

Note 3 :XV1032 : Auto drain valve just upstream of ST LP-CV

ST Output> 10% MCR

ST CRV Seat Drain Valves AUTO/(Close)by ST TCS

Yes

No (Wait) No (Wait) No (Wait)

No (Wait)

No (Wait)

Block AUTO operation and then open ST HP piping drain valves (See Note 1.):

XV1008 MANUAL/OPENXV1009 MANUAL/OPENST CMV Seat Drain Valves AUTO/OPEN

5 min. elapsed ANDST IPC Control ON

Put drain valves in AUTO operation :

XV1008 AUTO/(Close)XV1009 AUTO/(Close)

Yes

ST Output> 10% MCR

ST CMV Seat Drain Valves AUTO/(Close)by ST TCS

Yes

No (Wait)

No (Wait)

Yes

Block AUTO operation and then open ST LP piping drain valves (See Note 3.):

XV1032 MANUAL/OPEN

5 min. elapsed ANDST LP-CV Control ON

Put drain valves in AUTO operation :

XV1032 AUTO/(Close)

Yes

No (Wait)

G(013, D)

ST LPCVControl ON

Yes

HRSG1 Isolation

Valves Open

Yes

HRSG1 LP Isolation

Valve Open

Yes

ENGS

OFT

APS-FC-110, Rev. A

Dwg. No. APS-FC-110 / ST Piping Drain Operation by LEAD HRSG2 (Same with HRSG1)

A(109, B)

B(109, C)

HRSG2 HRH Isolation Valve Fully Open ANDHRSG2 CRH Isolation Valve Fully Open

HRSG2 HP IsolationValve Fully Open

HRSG2 LP IsolationValve Fully Open

HRSG2 HRH/CRH/HPIsolation Valves OPEN

HRSG2 LPIsolation Valve OPEN

C(106, C)

Yes(Upstream Drain

Valve AUTO)

D(106, B)

Yes(Upstream Drain

Valve AUTO)

E(106, D)

Yes(Upstream Drain

Valve AUTO)

Block AUTO operation and then open ST RH piping drain valves (See Note 2.):

XV1013 MANUAL/OPENXV1018 MANUAL/OPENXV1031 MANUAL/OPENST CRV Seat Drain Valves AUTO/OPEN

Yes

5 min. elapsed ANDCRH Press > 3.5 atg

Put drain valves in AUTO operation :

XV1013 AUTO/(Close)

Put drain valves in AUTO operation :

XV1018 AUTO/(Close)XV1031 AUTO/(Close)

ST IPCControl ON

F(112, C)

Yes

Note 1 :XV1008 : Auto drain valve(A) just upstream of ST CMVXV1009 : Auto drain valve(B) just upstream of ST CMV

Note 2 :XV1013 : Auto drain valve in ST CRH pipingXV1018 : Auto drain valve(A) just upstream of ST CRVXV1031 : Auto drain valve(B) just upstream of ST CRV

* Capacities of XV1018 and XV1031 are very important for satisfying reheat steam temperature for ST start-up within reasonable time. If not sufficient, start-up time will be long.

Note 3 :XV1032 : Auto drain valve just upstream of ST LP-CV

ST Output> 10% MCR

ST CRV Seat Drain Valves AUTO/(Close)by ST TCS

Yes

No (Wait) No (Wait) No (Wait)

No (Wait)

No (Wait)

Block AUTO operation and then open ST HP piping drain valves (See Note 1.):

XV1008 MANUAL/OPENXV1009 MANUAL/OPENST CMV Seat Drain Valves AUTO/OPEN

5 min. elapsed ANDST IPC Control ON

Put drain valves in AUTO operation :

XV1008 AUTO/(Close)XV1009 AUTO/(Close)

Yes

ST Output> 10% MCR

ST CMV Seat Drain Valves AUTO/(Close)by ST TCS

Yes

No (Wait)

No (Wait)

Yes

Block AUTO operation and then open ST LP piping drain valves (See Note 3.):

XV1032 MANUAL/OPEN

5 min. elapsed ANDST LP-CV Control ON

Put drain valves in AUTO operation :

XV1032 AUTO/(Close)

Yes

No (Wait)

G(113, D)

ST LPCVControl ON

Yes

HRSG2 Isolation

Valves Open

Yes

HRSG2 LP Isolation

Valve Open

Yes

ENGS

OFT

APS-FC-011, Rev. A

Dwg. No. APS-FC-011 / ST Start-up by LEAD HRSG1

HRSG1 HP Start-up Vent Valve Close ANDHRSG1 HP Steam Flow > 40 ton/hr ANDHRSG1 HP and HRH Bypass Spray Valve in CAS ANDHRSG1 HP and HRH Bypass Valve in CAS

< Temperature Matching for ST >Send the following signal to GT1 TCP :

“EXHAUST TEMP MATCH REFERENCE” = “GT TEMP MATCHING CONTROL SET POINT” from ST TCS plus 3 oC

Reheat flow is established AND HP bypass temp control ON

AND HRH bypass control ON

Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL

ON” mode, merely change of “EXHAUST TEMP MATCH

REFERENCE” enforces GT to perform temperature matching

Yes

N0(Wait)

A(009, E)

HRSG1 HP BypassSpray Valve in CAS

B(009, F)

HRSG1 HRH BypassValve in CAS

ST RESET for Trip

ST RESETCompleted No

Clear ST Trip Conditions

(by Operator)

ST START(CB)

Send “ST PERMISSIVE CONDITION FROM HRSG BOP SIDE” signal to ST TCS

ST “READY TO START” signal from ST TCS Received

Turn on ST “REMOTE”at ST TCS

(by Operator)

No (Wait)

Yes

ST Ready for Synchronization at ST

TCS

Send ST “START” signal to ST TCS

No (Wait)

ST GCB “AUTO SYNCHRO” Selected

No

MANUAL SYNCHRO at ST TCS

(by Operator)

Yes

ST Synchronized and Loaded to Minimum Loadby ST TCS

Yes

ST Output > 3 MW

No (Wait)

ST Start-up Permissive Conditions Check as below :

HRSG1 HRH HP/CRH/HRH Isolation Valves Open ANDCondenser Pressure < 4 inch Hg abs.

Yes

ST Start-up Permissive Conditions OK

No(Wait)

HRSG1 Steam Quality OK (CB)

Yes

Yes

HRSG HP and HRH steam temperature check is not required, because ST will

check for itself. (See Note 1.)

C(009, G)

HRSG1 HP/CRH/HRHIsolation Valves OPEN

D(009, H)

HRSG1 HP BypassValve in CAS

ST START

ST AUTO SYNCH

Yes

ST TCS “REMOTE”Selected

No

Yes

ST READY TO START

Yes

ST SYNCHR-ONIZED

Yes

E(012, A)

Yes

HRSG1 RH Flow Established Yes

GT1 LEAD

Yes

No(GT1 LAG)

F(012, D)

HRSG1 Steam Quality OK

Temp Match for ST

G(009, K)

HRSG1 HRH BypassSpray Valve in CAS

Note 1 :HRSG HP and HRH steam minimum temperature required by ST should be satisfied for ST start-up, and these minimum temperature should be met by steam evacuation through drain valves just upstream of ST inlet. The drain valve sizing should be large enough to achieve the minimum temperature within guarantee CCPP start-up time.

ENGS

OFT

APS-FC-111, Rev. A

Dwg. No. APS-FC-111 / ST Start-up by LEAD HRSG2 (Same with HRSG1)

HRSG2 HP Start-up Vent Valve Close ANDHRSG2 HP Steam Flow > 40 ton/hr ANDHRSG2 HP and HRH Bypass Spray Valve in CAS ANDHRSG2 HP and HRH Bypass Valve in CAS

< Temperature Matching for ST >Send the following signal to GT2 TCP :

“EXHAUST TEMP MATCH REFERENCE” = “GT TEMP MATCHING CONTROL SET POINT” from ST TCS plus 3 oC

Reheat flow is established AND HP bypass temp control ON

AND HRH bypass control ON

Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL

ON” mode, merely change of “EXHAUST TEMP MATCH

REFERENCE” enforces GT to perform temperature matching

Yes

N0(Wait)

A(109, E)

HRSG2 HP BypassSpray Valve in CAS

B(109, F)

HRSG2 HRH BypassValve in CAS

ST RESET for Trip

ST RESETCompleted No

Clear ST Trip Conditions

(by Operator)

ST START(CB)

Send “ST PERMISSIVE CONDITION FROM HRSG BOP SIDE” signal to ST TCS

ST “READY TO START” signal from ST TCS Received

Turn on ST “REMOTE”at ST TCS

(by Operator)

No (Wait)

Yes

ST Ready for Synchronization at ST

TCS

Send ST “START” signal to ST TCS

No (Wait)

ST GCB “AUTO SYNCHRO” Selected

No

MANUAL SYNCHRO at ST TCS

(by Operator)

Yes

ST Synchronized and Loaded to Minimum Loadby ST TCS

Yes

ST Output > 3 MW

No (Wait)

ST Start-up Permissive Conditions Check as below :

HRSG2 HRH HP/CRH/HRH Isolation Valves Open ANDCondenser Pressure < 4 inch Hg abs.

Yes

ST Start-up Permissive Conditions OK

No(Wait)

HRSG2 Steam Quality OK (CB)

Yes

Yes

HRSG HP and HRH steam temperature check is not required, because ST will

check for itself. (See Note 1.)

C(109, G)

HRSG2 HP/CRH/HRHIsolation Valves OPEN

D(109, H)

HRSG2 HP BypassValve in CAS

ST START

ST AUTO SYNCH

Yes

ST TCS “REMOTE”Selected

No

Yes

ST READY TO START

Yes

ST SYNCHR-ONIZED

Yes

E(112, A)

Yes

HRSG2 RH Flow Established Yes

GT2 LEAD

Yes

No(GT2 LAG)

F(112, D)

HRSG2 Steam Quality OK

Temp Match for ST

G(109, K)

HRSG2 HRH BypassSpray Valve in CAS

Note 1 :HRSG HP and HRH steam minimum temperature required by ST should be satisfied for ST start-up, and these minimum temperature should be met by steam evacuation through drain valves just upstream of ST inlet. The drain valve sizing should be large enough to achieve the minimum temperature within guarantee CCPP start-up time.

ENGS

OFT

APS-FC-012, Rev. A

Dwg. No. APS-FC-012 / LEAD GT1 Ramp-up to 50% Load(100 MW)

A(011, E)

ST TCS performs the following :

Heat Soaking at Minimum LoadICV to CV TransferIPC ON.

ST at Minimum Load

ST “IPC ON” No(Wait)

HRSG1 HRH Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 2 kg/cm2

Yes

HRSG1 HRH Bypass Valve Full Close

No(Wait)

HRSG1 HP Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 3 kg/cm2

Yes

ST IPC ON Yes

HRSG1 HRH Bypass

Valve CloseYes

HRSG1 HP Bypass Valve Full Close

HRSG1 HP Bypass

Valve CloseYes

< GT1 Load Ramping-up by Temperature Matching >Send the following signal to GT1 TCP :

“EXHAUST TEMP MATCH RAMP RATE” =Limit Value from ST TCS (2.5 oC/min)“EXHAUST TEMP MATCH REFERENCE” = 575 oC

Yes

Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL

ON” mode, merely change of “EXHAUST TEMP MATCH

REFERENCE” enforces GT to perform temperature matching

HRSG1 HP Steam Temperature > 555 oC

No(Wait)

< GT1 Load Ramping-up by External Load Control >Send the following signal to GT1 TCP :

EXTERNAL LOAD SET = 101 MWEXHAUST TEMP MATCH CONTROL OFFEXTERNAL LOAD CONTROL ON

GT load ramping-up by load control is no good for steam temperature

ramping rate control.Ramping-up by temperature

matching is better.

GT1 Load Up by Temp Match

Yes

GT1 Load Up by Load Control

HRSG1 HP Drum Temp Change Rate < Limit Vale ANDHRSG1 HP Steam Temp < 570 oC ANDHRSG1 HRH Steam Temp < 570 oC ANDST Load NOT Limited

GT1 LOADING RATE SET = Limit Value from ST TCS multiplied by 2.67

Yes

GT1 LOADING RATE SET = 0

No

GT1 Output >= 100 MW

GT1 Output 100MWYes

No(GT1 LAG)

B(013, C) Yes

C(010, F) Yes

In 2-2-1 CCPP, 2.67% output increase of one

GT results in 1% increase of ST output.

“ST Load NOT Limited”condition may not be

required, if ST controls over-loading for itself.

D(011, F) GT1 LAG

GT1 LOADING RATE SET = 8 MW/min.

GT1 LEAD

Yes

No(GT1 LAG)

For HRSGs stable operation, a half of maximum rate is

selected

No(Repeat)

F(014, A)

HRSG1 Steam Quality OK (CB)

HRSG1 Steam Quality OK

GT1 LEAD

Yes

Yes

ST is capable of accepting high flow steam in IPC On mode without any trouble. Therefore, bypass valve closing on ST IPC ON by

floating set pressure is OK.

ENGS

OFT

APS-FC-112, Rev. A

Dwg. No. APS-FC-112 / LEAD GT2 Ramp-up to 50% Load(100 MW) (Same with GT1)

A(111, E)

ST TCS performs the following :

Heat Soaking at Minimum LoadICV to CV TransferIPC ON.

ST at Minimum Load

ST “IPC ON” No(Wait)

HRSG2 HRH Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 2 kg/cm2

Yes

HRSG2 HRH Bypass Valve Full Close

No(Wait)

HRSG2 HP Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 3 kg/cm2

Yes

ST IPC ON Yes

HRSG2 HRH Bypass

Valve CloseYes

HRSG1 HP Bypass Valve Full Close

HRSG2 HP Bypass

Valve CloseYes

< GT2 Load Ramping-up by Temperature Matching >Send the following signal to GT2 TCP :

“EXHAUST TEMP MATCH RAMP RATE” =Limit Value from ST TCS (2.5 oC/min)“EXHAUST TEMP MATCH REFERENCE” = 575 oC

Yes

Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL

ON” mode, merely change of “EXHAUST TEMP MATCH

REFERENCE” enforces GT to perform temperature matching

HRSG2 HP Steam Temperature > 555 oC

No(Wait)

< GT2 Load Ramping-up by External Load Control >Send the following signal to GT2 TCP :

EXTERNAL LOAD SET = 101 MWEXHAUST TEMP MATCH CONTROL OFFEXTERNAL LOAD CONTROL ON

GT load ramping-up by load control is no good for steam temperature

ramping rate control.Ramping-up by temperature

matching is better.

GT2 Load Up by Temp Match

Yes

GT2 Load Up by Load Control

HRSG2 HP Drum Temp Change Rate < Limit Vale ANDHRSG2 HP Steam Temp < 570 oC ANDHRSG2 HRH Steam Temp < 570 oC ANDST Load NOT Limited

GT2 LOADING RATE SET = Limit Value from ST TCS multiplied by 2.67

Yes

GT2 LOADING RATE SET = 0

No

GT2 Output >= 100 MW

GT2 Output 100MWYes

No(GT2 LAG)

B(113, C) Yes

C(110, F) Yes

In 2-2-1 CCPP, 2.67% output increase of one

GT results in 1% increase of ST output.

“ST Load NOT Limited”condition may not be

required, if ST controls over-loading for itself.

D(111, F) GT2 LAG

GT2 LOADING RATE SET = 8 MW/min.

GT2 LEAD

Yes

No(GT2 LAG)

For HRSGs stable operation, a half of maximum rate is

selected

No(Repeat)

F(114, A)

HRSG2 Steam Quality OK (CB)

HRSG2 Steam Quality OK

GT2 LEAD

Yes

Yes

ST is capable of accepting high flow steam in IPC On mode without any trouble. Therefore, bypass valve closing on ST IPC ON by

floating set pressure is OK.

ENGS

OFT

APS-FC-013, Rev. A

Dwg. No. APS-FC-013 / LEAD & LAG HRSG1 LP Addition to ST

A(009, I)

HRSG1 LP IsoValve OPEN

Yes

No(Wait)

C(012, B)

ST TCS puts LPCV Control On if the following conditions are satisfied :

ST IPC ONST Output > 35% MCRHRSG1 LP Steam Press > 1.1 kg/cm2gHRSG1 LP Steam Superheat Degree > 28 oC

ST IPC ON

ST LPCV Control ON

No (Wait)

HRSG1 LP Start-up Vent Valve CLOSE not to exceed the following limit

- (-) 50 mm > LP Drum Level > (-) 350 mm

Yes

ST LPCV Control ON Yes

B(009, J)

HRSG1 LP EconBypass CAS

HRSG1 LP Econ Bypass Valve CAS ANDHRSG1 LP Isolation Valve Open

HRSG1 LP Start-up Vent Valve Fully Closed

HRSG1 LP Econ Bypass Valve CAS/SET at 7.6 kg/cm2gHRSG1 LP Start-up Vent Valve CAS/SET at 8 kg/cm2g

Yes

No(Wait)

Note 1 :HRSG LP steam is generated by setting LP Econ Bypass Valve at 7.6 kg/cm2g.By the setting, HRSG LP steam generation is suppressed if LP steam pressure is higher than 7.6 kg/cm2g.

If HRSG LP steam pressure is higher than 8 kg/cm2g, LP start-up vent valve shall be open.

D(010, F) Yes

GT1 LEADYes

LP Steam Temp Difference between HRSG1 and HRSG2 < 50 oC

No(GT1 LAG)

HRSG1 LP Econ Bypass Valve Set Pressure SET at HRSG2 LP Drum Steam Pressure

Yes

No(Wait)

LP Steam Press Difference between HRSG1 and HRSG2 < 1 kg/cm2

Yes

No(Wait)

HRSG1 LP Isolation Valve AUTO/OPEN

HRSG1 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close

ST LPCV Control ON ANDHRSG1 LP Isolation Valve Open

Yes

Yes

No(Wait)

E(016, E) APS SU End

HRSG1 LP Isolation

Valve Open

HRSG1 LP Addition to ST

Complete

ENGS

OFT

APS-FC-113, Rev. A

Dwg. No. APS-FC-113 / LEAD & LAG HRSG2 LP Addition to ST (Same with HRSG1)

A(109, I)

HRSG2 LP IsoValve OPEN

Yes

No(Wait)

C(112, B)

ST TCS puts LPCV Control On if the following conditions are satisfied :

ST IPC ONST Output > 35% MCRHRSG2 LP Steam Press > 1.1 kg/cm2gHRSG2 LP Steam Superheat Degree > 28 oC

ST IPC ON

ST LPCV Control ON

No (Wait)

HRSG2 LP Start-up Vent Valve CLOSE not to exceed the following limit

- (-) 50 mm > LP Drum Level > (-) 350 mm

Yes

ST LPCV Control ON Yes

B(109, J)

HRSG2 LP EconBypass CAS

HRSG2 LP Econ Bypass Valve CAS ANDHRSG2 LP Isolation Valve Open

HRSG2 LP Start-up Vent Valve Fully Closed

HRSG2 LP Econ Bypass Valve CAS/SET at 7.6 kg/cm2gHRSG2 LP Start-up Vent Valve CAS/SET at 8 kg/cm2g

Yes

No(Wait)

Note 1 :HRSG LP steam is generated by setting LP Econ Bypass Valve at 7.6 kg/cm2g.By the setting, HRSG LP steam generation is suppressed if LP steam pressure is higher than 7.6 kg/cm2g.

If HRSG LP steam pressure is higher than 8 kg/cm2g, LP start-up vent valve shall be open.

D(110, F) Yes

GT2 LEADYes

LP Steam Temp Difference between HRSG1 and HRSG2 < 50 oC

No(GT2 LAG)

HRSG2 LP Econ Bypass Valve Set Pressure SET at HRSG1 LP Drum Steam Pressure

Yes

No(Wait)

LP Steam Press Difference between HRSG1 and HRSG2 < 1 kg/cm2

Yes

No(Wait)

HRSG2 LP Isolation Valve AUTO/OPEN

HRSG2 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close

ST LPCV Control ON ANDHRSG2 LP Isolation Valve Open

Yes

Yes

No(Wait)

E(016, K) APS SU End

HRSG2 LP Isolation

Valve Open

HRSG2 LP Addition to ST

Complete

ENGS

OFT

APS-FC-014, Rev. A

Dwg. No. APS-FC-014 / LAG HRSG1 HP Addition to ST

A(012, F)

GT1 100 MW ANDHRSG1 Steam Quality OK

HRSG1 Isolation Valves OPEN in the Following Order :

HRH Isolation Valve OPENCRH Isolation Valve OPENHP Isolation Valve OPEN

HRSG1 Isolation

Valves OpenYes

HRSG1 HP Isolation Valve Open

No(Wait)

HRSG1 HRH Bypass Valve CAS/SET at “HRH BYPASS PRESS CONTROL SET POINT” from STG TCS

This SET makes HRH bypass valve follow ST

natural pressure.Therefore, HRH bypass

valve automatically closes as HP bypass valve is forced to

close.

Yes

30 seconds Elapsed No(Wait)

HRSG1 HP Bypass Valve FORCED TO CLOSE not to exceed the following limit

HRSG1 HP Drum Temp Change Rate < Limit Vale ANDHRSG1 HP Steam Temp < 565 oC ANDHRSG1 HRH Steam Temp < 565 oC ANDHP Steam Pressure Difference between HRSG1 and HRSG2 < 20 kg/cm2 AND (See Note 2.)ST Load NOT Limited

Yes

“ST Load NOT Limited”condition may not be

required, if ST controls over-loading for itself.

HP Bypass Valve Opening < 10%

HRSG1 HP Bypass Valve FORCED TO FULL CLOSE

Yes

No(Wait)

HRH Bypass ValveOpening < 10%

HP Bypass ValveFully Closed

Float HRSG1 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG1 HP Steam Pressure

Yes

Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve

set pressure.

No(Wait)

Yes

Yes

HRSG1 HRH Bypass Valve FORCED TO FULL CLOSE

Float HRSG1 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG1 HRH Steam Pressure

No(Wait)

Maximum set pressure shall be limited above maximum operating

pressure, but less than HRSG RH safety valve

set pressure.

HRH Bypass ValveFully Closed

Yes

No(Wait)

Yes

GT1 LEAD

No(GT1 LAG)

Note 1 :When LAG GT arrives at 100 MW, both GT’s shall start ramp-up to target load, and simultaneously LAG HRSG addition, i.e. opening of isolation valves, starts.

This makes start-up time short. If ST loading rate is over its allowable limit, ST throttles its control valves for itself.

GT1 Ready for Ramp-up

B(015, A)

(See Note 1.)

Yes

C(016, C)APS SU End

D(016, D)APS SU End

HRSG1 HP Addition to ST

Complete

Note 2 :When HRSG2 located far from ST starts as LAG, sometimes HRSG2 HP steam pressure is built up much above HRSG1 HP steam pressure due to HRSG2 HP steam check valve not fully open.If HRSG2 HP steam check valve is suddenly open with high differential pressure, ST trips due to high HP steam turbine differential expansion.

Therefore, the HP differential pressure between HRSG1 and HRSG2 should be monitored.

Both GT’s & HRSG’s Condition Match :

Output Difference between GT1 and GT2 < 3 MWHP Steam Pressure Difference between HRSG1 and HRSG2 < 5 kg/cm2HRH Steam Pressure Difference between HRSG1 and HRSG2 < 3.5 kg/cm2 HP and HRH Temperature Difference between HRSG1 and HRSG2 < 17 oC

Both GT’s & HRSG’s Condition Match OK

Yes

No(Wait)

ENGS

OFT

APS-FC-114, Rev. A

Dwg. No. APS-FC-114 / LAG HRSG2 HP Addition to ST (Same with HRSG1)

A(112, F)

GT2 100 MW ANDHRSG2 Steam Quality OK

HRSG2 Isolation Valves OPEN in the Following Order :

HRH Isolation Valve OPENCRH Isolation Valve OPENHP Isolation Valve OPEN

HRSG2 Isolation

Valves OpenYes

HRSG2 HP Isolation Valve Open

No(Wait)

HRSG2 HRH Bypass Valve CAS/SET at “HRH BYPASS PRESS CONTROL SET POINT” from STG TCS

This SET makes HRH bypass valve follow ST

natural pressure.Therefore, HRH bypass

valve automatically closes as HP bypass valve is forced to

close.

Yes

30 seconds Elapsed No(Wait)

HRSG2 HP Bypass Valve FORCED TO CLOSE not to exceed the following limit

HRSG2 HP Drum Temp Change Rate < Limit Vale ANDHRSG2 HP Steam Temp < 565 oC ANDHRSG2 HRH Steam Temp < 565 oC ANDHP Steam Pressure Difference between HRSG1 and HRSG2 < 20 kg/cm2 AND (See Note 2.)ST Load NOT Limited

Yes

“ST Load NOT Limited”condition may not be

required, if ST controls over-loading for itself.

HP Bypass Valve Opening < 10%

HRSG2 HP Bypass Valve FORCED TO FULL CLOSE

Yes

No(Wait)

HRH Bypass ValveOpening < 10%

HP Bypass ValveFully Closed

Float HRSG2 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG2 HP Steam Pressure

Yes

Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve

set pressure.

No(Wait)

Yes

Yes

HRSG2 HRH Bypass Valve FORCED TO FULL CLOSE

Float HRSG2 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG2 HRH Steam Pressure

No(Wait)

Maximum set pressure shall be limited above maximum operating

pressure, but less than HRSG RH safety valve

set pressure.

HRH Bypass ValveFully Closed

Yes

No(Wait)

Yes

GT2 LEAD

No(GT2 LAG)

Note 1 :When LAG GT arrives at 100 MW, both GT’s shall start ramp-up to target load, and simultaneously LAG HRSG addition, i.e. opening of isolation valves, starts.

This makes start-up time short. If ST loading rate is over its allowable limit, ST throttles its control valves for itself.

GT2 Ready for Ramp-up

Yes

C(016, I)APS SU End

D(016, J)APS SU End

HRSG2 HP Addition to ST

Complete

Note 2 :When HRSG2 located far from ST starts as LAG, sometimes HRSG2 HP steam pressure is built up much above HRSG1 HP steam pressure due to HRSG2 HP steam check valve not fully open.If HRSG2 HP steam check valve is suddenly open with high differential pressure, ST trips due to high HP steam turbine differential expansion.

Therefore, the HP differential pressure between HRSG1 and HRSG2 should be monitored.

B(015, B)

(See Note 1.)

Both GT’s & HRSG’s Condition Match :

Output Difference between GT1 and GT2 < 3 MWHP Steam Pressure Difference between HRSG1 and HRSG2 < 5 kg/cm2HRH Steam Pressure Difference between HRSG1 and HRSG2 < 3.5 kg/cm2 HP and HRH Temperature Difference between HRSG1 and HRSG2 < 17 oC

Both GT’s & HRSG’s Condition Match OK

Yes

No(Wait)

ENGS

OFT

APS-FC-015, Rev. A

Dwg. No. APS-FC-015 / Both GT s Ramp-up to Target Load

A(014, B)

Both GT’s Ready for Ramp-up

Yes

Both GT’s Ready for Ramp up Yes

B(114, B) GT2 Ready for Ramp-up

Gt1 Ready for Ramp-up

BASE LOAD TARGET

GT1 LOADING RATE SET = 17 MW/min.

GT maximum loading rate is 8.33%/min., but it should be

input by MW/min. unit.Since GT base load output at 15 oC ambient temperature is 170 MW, 17 MW/min. is

always higher than the maximum loading rate.

< Simultaneous GT1 and GT2 Ramping-up to Base Load >Send the following signal simultaneously to GT1 and GT2 TCP :

BASE

Yes

< Simultaneous GT1 and GT2 Ramping-up to Target Load by AGC (Automatic Generation Control) >

Transfer control to AGC, which ramps up GT1 and GT2 load to target load simultaneously.

No(CCPP

OUTPUTTARGET)

AGC ramps up and down CCPP load by using RAISE SPEED/LOAD or LOWER

SPEED/LOAD signal of GT TCP.

Yes(APS SU EndSee Note 1.)

Note 1 :Both GT’s ramp-up to target load need not to be controlled by APS, so that APS SU ends when both GT’s are ready for ramp-up for target load.

However, start-up time should be measured till both GT’s reach their target load.

C(016, F)

ENGS

OFT

APS-FC-016, Rev. A

Dwg. No. APS-FC-016 / APS SU Start & End

APS SUStart

HRSG1 & 2 Start-up Mode Selection(APS-FC-001)

Target Load Input & ST Start-up Mode Selection

(APS-FC-002)

GT(+ HRSG) SU Order Selection(APS-FC-003)

APS SU Start(CB)

A(008, C) GT1 & HRSG1 SU Start

B(108, C) GT2 & HRSG2 SU Start

APS SUEnd

C(014, C)

LAG HRSG1 HP BypassValve Fully Closed

D(014, D)

LAG HRSG1 HRH BypassValve Fully Closed

E(013, E)

LAG HRSG1 LP EconBypass Valve CAS

F(015, C)

Both GT’s Readyfor Ramp-up

APS SU Start

G(008, D)

GT1 IDLE/RUN

I(114, C)

LAG HRSG2 HP BypassValve Fully Closed

H(108, D)

GT2 IDLE/RUN

J(114, D)

LAG HRSG2 HRH BypassValve Fully Closed

K(113, E)

LAG HRSG2 LP EconBypass Valve CAS

ENGS

OFT

APS SD FC Drawing List

APS-FC-200, Rev. A :

APS-FC-201, Rev. A :

APS-FC-202, Rev. A :

Drawing List

GT(+ HRSG) SD Order Selection

APS SD Start & End

APS-FC-203, Rev. A :

APS-FC-303, Rev. A :

APS-FC-204, Rev. A :

APS-FC-304, Rev. A :

APS-FC-205, Rev. A :

APS-FC-305, Rev. A :

GT1 Load down to 100 MW and HRSG1 Bypass Valves Set-up

GT2 Load down to 100 MW and HRSG2 Bypass Valves Set-up (Same with HRSG1)

LEAD HRSG1 Isolation or ST Stop for LAG HRSG1

LEAD HRSG2 Isolation or ST Stop for LAG HRSG2(Same with HRSG1)

GT1 Stop and HRSG1 Bypass Valve Close

GT2 Stop and HRSG2 Bypass Valve Close (Same with HRSG1)

Dwg. No. Title

APS-FC-200, Rev. A

Dwg. No. APS-FC-200 / APS Shut-down Flow Chart Drawing List

ENGS

OFT

APS-FC-201, Rev. A

Dwg. No. APS-FC-201 / GT(+ HRSG) SD Order Selection

Train SD Order Selection Start

GT1 LEAD(CB)

GT1 LEAD

No

GT1 LAG(CB)

GT1 LAG

NoY

es

GT1 IDLE/RUN(CB)

GT1 IDLE/RUN

Yes(N/A)

Yes(N/A)

Train SD Order Selection End

GT2 LEAD GT2 LAG

GT2 LEAD(CB)

GT2 LEAD

No

GT2 LAG(CB)

GT2 LAG

No

Yes

GT2 IDLE/RUN(CB)

GT2 IDLE/RUN

Yes(N/A)

Yes(N/A)

GT1 LEAD GT1 LAGENGS

OFT

페이지 28

Dwg. No. APS-FC-201 / APS SD Start & End

APS SDStart

GT(+ HRSG) SD Order Selection(APS-FC-201)

APS SD Start(CB)

A(203, A)

GT1 & HRSG1SD Start

B(303, A) GT2 & HRSG2 SD Start

APS SDEnd

D(205, C)

HRSG1 HP BypassValve Fully Closed

E(205, D)

HRSG1 HRH BypassValve Fully Closed

APS SD Start

C(203, B)GT1 IDLE/RUN or N/A

G(305, C)

HRSG2 HP BypassValve Fully Closed

F(303, B)GT2 IDLE/RUN or N/A

H(305, D)

HRSG2 HRH BypassValve Fully Closed

ENGS

OFT

APS-FC-203, Rev. A

Dwg. No. APS-FC-203 / GT1 Load down to 100 MW and HRSG1 Bypass Valves Set-up

GT1 Automatic Generation Control MANUALFor making APS control GT1

A(202, A)

GT2 IDLE/RUN

GT1 & HRSG1SD Start

GT1 LAG

Yes(GT2 RUN)

Yes(N/A, APS SD End)

GT2 Synchronized

Yes

GT1 LEAD

No(GT2 IDLE)

Yes(N/A, APS SD End)

No

GT1 IDLE/RUN

No

B(202, C)

Yes(APS SD End)

No(GT1 LEAD

or LAG)

No

GT1 Output > 100 MW

< GT1 Load-down by External Load Control >Send the following signal to GT1 TCP :

EXTERNAL LOAD SET = 99 MWEXTERNAL LOAD CONTROL ON

GT1 Load Down by

Load Control

Yes

HRSG1 HP Drum Temp Change Rate < Limit Vale ANDHRSG1 HP Steam Temp < 570 oC ANDHRSG1 HRH Steam Temp < 570 oC ANDST Load NOT Limited ANDDifference between GT1 and GT2 Ouput < 5 MW

GT1 LOADING RATE SET = Limit Value from ST TCS multiplied by 1.33 (Two GT’s Load-down)

Yes

GT1 LOADING RATE SET = 0

No

GT1 Output CRH Sat. Temp)

No(Wait)

No(Wait)

Yes

No

ENGS

OFT

APS-FC-303, Rev. A

Dwg. No. APS-FC-303 / GT2 Load down to 100 MW and HRSG2 Bypass Valves Set-up(Same with HRSG1)

GT2 Automatic Generation Control MANUALFor making APS control GT2

A(202, B)

GT1 IDLE/RUN

GT2 & HRSG2SD Start

GT2 LAG

Yes(GT1 RUN)

Yes(N/A, APS SD End)

GT1 Synchronized

Yes

GT2 LEAD

No(GT1 IDLE)

Yes(N/A, APS SD End)

No

GT2 IDLE/RUN

No

B(202, F)

Yes(APS SD End)

No(GT2 LEAD

or LAG)

No

GT2 Output > 100 MW

< GT2 Load-down by External Load Control >Send the following signal to GT2 TCP :

EXTERNAL LOAD SET = 99 MWEXTERNAL LOAD CONTROL ON

GT2 Load Down by

Load Control

Yes

HRSG2 HP Drum Temp Change Rate < Limit Vale ANDHRSG2 HP Steam Temp < 570 oC ANDHRSG2 HRH Steam Temp < 570 oC ANDST Load NOT Limited ANDDifference between GT1 and GT2 Ouput < 5 MW

GT2 LOADING RATE SET = Limit Value from ST TCS multiplied by 1.33 (Two GT’s Load-down)

Yes

GT2 LOADING RATE SET = 0

No

GT2 Output CRH Sat. Temp)

No(Wait)

No(Wait)

Yes

No

ENGS

OFT

APS-FC-204, Rev. A

Dwg. No. APS-FC-204 / LEAD HRSG1 Isolation or ST Stop for LAG HRSG1

A(203, C)

GT1 100 MW andBypass Valves Set-up

Complete

HRSG1 HP Bypass Valve FORCED TO OPEN not to exceed the following limit :

HRSG1 HP Bypass Discharge Temp < 365 oC ANDHRSG1 HRH Bypass Discharge Temp < 250 oC ANDST Unload NOT Limited

Yes

“ST Load NOT Limited”condition is required,

because ST can not control over-unloading for itself..

Note 1 :HP bypass flow shall be calculated based on bypass valve opening, inlet pressure, inlet temperature, outlet pressure,and valve constant provided by bypass valve manufacturer.

GT1 LEAD

HRSG1 HP Steam Flow Measured is within HRSG1 HP Bypass Flow Calculated +/- 5%

(See Note 1.)

No(Repeat)

Lock HRSG1 HP Bypass Valve MANUAL / CURRENT OPENLock HRSG1 HRH Bypass Valve MANUAL / CURRENT OPEN

Yes

1 minute elapsed No(Wait)

Yes

HRSG1 Isolation Valves CLOSE in the Following Order :

HP Isolation Valve OPENCRH Isolation Valve OPENHRH Isolation Valve OPEN

Yes

HRSG1 HRH Isolation ValveFully Closed

No(Wait)

Yes

1 minute elapsed No(Wait)

Note 2 :Even though HRSG LP steam is not generated by this CAS SET, there is no reverse flow due to the stop/check valve in HRSG LP steam outlet piping.

HRSG1 LP Isolation Valve CLOSE

Yes

HRSG1 HP Bypass Valve CAS / SET at CURRENT PRESSUREHRSG1 HRH Bypass Valve CAS / SET at CURRENT PRESSURE

HRSG1 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g (See Note 2.)

Yes(GT1 Stop)

B(205, A)

HRSG1 HP Bypass Valve CAS / SET at 53 kg/cm2g(See Remarks 8.)

No(GT1 LAG)

HRSG2 HP, CRH and HRH Isolation Valve

Fully Closed

No(Wait)

Yes

2 minutes elapsed(for bypass stabilization at 53

kg/cm2g)

No(Wait)

Sent the following signal to ST TCS for ST Shut-down :

ISOLATION OF NO. 1 TRAINST STOP

Yes

Upon receipt of ST STOP signal from DCS, ST TCS first performs ST LP-CV OFF; closes ST LP inlet pressure control valve: and then send ST LP-CV OFF signal to

DCS.

ST LP-CV OFFsignal received

No(Wait)

HRSG1 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g

Yes

After sending ST LP-CV OFF signal to DCS, ST TCS performs the following job :

Decrease STG load to 25% load.Transfer from CV to ICV at 25% STG load.Decrease STG load to 5% load rapidly.Trip STG (GCB open)

Then, ST TCS sends ST NORMAL TRIP to DCS.

HRSG1 LP Isolation ValveFully Closed

No(Wait)

ST NORMAL TRIPsignal received

No(Wait)

C(205, B)

Yes(GT1 Stop)

HRSG1 HRH Bypass Valve CAS / SET at 6.5 kg/cm2g

ST Stop

LEAD HRSG1 Isolated

Yes

ENGS

OFT

APS-FC-304, Rev. A

Dwg. No. APS-FC-304 / LEAD HRSG2 Isolation or ST Stop for LAG HRSG2(Same with HRSG1)

A(303, C)

GT2 100 MW andBypass Valves Set-up

Complete

HRSG2 HP Bypass Valve FORCED TO OPEN not to exceed the following limit :

HRSG2 HP Bypass Discharge Temp < 365 oC ANDHRSG2 HRH Bypass Discharge Temp < 250 oC ANDST Unload NOT Limited

Yes

“ST Load NOT Limited”condition is required,

because ST can not control over-unloading for itself..

Note 1 :HP bypass flow shall be calculated based on bypass valve opening, inlet pressure, inlet temperature, outlet pressure,and valve constant provided by bypass valve manufacturer.

GT2 LEAD

HRSG2 HP Steam Flow Measured is within HRSG2 HP Bypass Flow Calculated +/- 5%

(See Note 1.)

No(Repeat)

Lock HRSG2 HP Bypass Valve MANUAL / CURRENT OPENLock HRSG2 HRH Bypass Valve MANUAL / CURRENT OPEN

Yes

1 minute elapsed No(Wait)

Yes

HRSG2 Isolation Valves CLOSE in the Following Order :

HP Isolation Valve OPENCRH Isolation Valve OPENHRH Isolation Valve OPEN

Yes

HRSG2 HRH Isolation ValveFully Closed

No(Wait)

Yes

1 minute elapsed No(Wait)

Note 2 :Even though HRSG LP steam is not generated by this CAS SET, there is no reverse flow due to the stop/check valve in HRSG LP steam outlet piping.

HRSG2 LP Isolation Valve CLOSE

Yes

HRSG2 HP Bypass Valve CAS / SET at CURRENT PRESSUREHRSG2 HRH Bypass Valve CAS / SET at CURRENT PRESSURE

HRSG2 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g (See Note 2.)

Yes(GT2 Stop)

B(305, A)

HRSG2 HP Bypass Valve CAS / SET at 53 kg/cm2g(See Remarks 8.)

No(GT2 LAG)

HRSG1 HP, CRH and HRH Isolation Valve

Fully Closed

No(Wait)

Yes

2 minutes elapsed(for bypass stabilization at 53

kg/cm2g)

No(Wait)

Sent the following signal to ST TCS for ST Shut-down :

ISOLATION OF NO. 1 TRAINST STOP

Yes

Upon receipt of ST STOP signal from DCS, ST TCS first performs ST LP-CV OFF; closes ST LP inlet pressure control valve: and then send ST LP-CV OFF signal to

DCS.

ST LP-CV OFFsignal received

No(Wait)

HRSG2 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g

Yes

After sending ST LP-CV OFF signal to DCS, ST TCS performs the following job :

Decrease STG load to 25% load.Transfer from CV to ICV at 25% STG load.Decrease STG load to 5% load rapidly.Trip STG (GCB open)

Then, ST TCS sends ST NORMAL TRIP to DCS.

HRSG2 LP Isolation ValveFully Closed

No(Wait)

ST NORMAL TRIPsignal received

No(Wait)

C(305, B)

Yes(GT2 Stop)

HRSG2 HRH Bypass Valve CAS / SET at 6.5 kg/cm2g

ST Stop

LEAD HRSG2 Isolated

Yes

ENGS

OFT

APS-FC-205, Rev. A

Dwg. No. APS-FC-205 / GT1 Stop and HRSG1 Bypass Valve Close

HRH Bypass ValveOpening < 10%

HP Bypass ValveFully Closed

Float HRSG1 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG1 HP Steam Pressure

Yes

Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve

set pressure.

No(Wait)

Yes

HRSG1 HRH Bypass Valve FORCED TO FULL CLOSE

Float HRSG1 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG1 HRH Steam Pressure

No(Wait)

Maximum set pressure shall be limited above maximum operating

pressure, but less than HRSG RH safety valve

set pressure.

HRH Bypass ValveFully Closed

Yes

No(Wait)

C(202, D) APS SD End

D(202, E)APS SD End

GT1 STOP(CB)

Turn on GT1 “REMOTE” at GT1 TCP

(by Operator)

Send GT1 “STOP” signal to GT1 TCP

(During GT1 stops, HRSG1 HP and HRH bypass valves close. HRSG1 HP Econ Bypass Valve also closes.)

GT1 TCP “REMOTE” Selected

No

Yes

GT1 Stop

A(204, B)

LEAD HRSG1Isolated

B(204, C)

ST Stopped forLAG HRSG1

HP Bypass ValveOpening < 10%

Yes

HRSG1 HP Bypass Valve FORCED TO FULL CLOSE

No(Wait)

Note :HRSG LP Econ Bypass Valve has no minimum opening, and thereby there is no need to float its set pressure.

HRSG1 HP Bypass Valve

ClosedYes

HRSG1 HRH Bypass Valve

ClosedYes

ENGS

OFT

APS-FC-305, Rev. A

Dwg. No. APS-FC-305 / GT2 Stop and HRSG2 Bypass Valve Close (Same with HRSG1)

HRH Bypass ValveOpening < 10%

HP Bypass ValveFully Closed

Float HRSG2 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG2 HP Steam Pressure

Yes

Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve

set pressure.

No(Wait)

Yes

HRSG2 HRH Bypass Valve FORCED TO FULL CLOSE

Float HRSG2 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG2 HRH Steam Pressure

No(Wait)

Maximum set pressure shall be limited above maximum operating

pressure, but less than HRSG RH safety valve

set pressure.

HRH Bypass ValveFully Closed

Yes

No(Wait)

C(202, G) APS SD End

D(202, H)APS SD End

GT2 STOP(CB)

Turn on GT2 “REMOTE” at GT2 TCP

(by Operator)

Send GT2 “STOP” signal to GT2 TCP

(During GT2 stops, HRSG2 HP and HRH bypass valves close. HRSG2 HP Econ Bypass Valve also closes.)

GT2 TCP “REMOTE” Selected

No

Yes

GT2 Stop

A(304, B)

LEAD HRSG2Isolated

B(304, C)

ST Stopped forLAG HRSG2

HP Bypass ValveOpening < 10%

Yes

HRSG2 HP Bypass Valve FORCED TO FULL CLOSE

No(Wait)

Note :HRSG LP Econ Bypass Valve has no minimum opening, and thereby there is no need to float its set pressure.

HRSG2 HP Bypass Valve

ClosedYes

HRSG2 HRH Bypass Valve

ClosedYes

ENGS

OFT