ML17250B112
| ML17250B112 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/09/1990 |
| From: | Widay J ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17250B096 | List:
|
| References | |
| ECA-2.1, NUDOCS 9004200681 | |
| Download: ML17250B112 (72) | |
Text
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 1 of 32 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL -REVIEW PORC REVIEW DATE P
T SUPERIN ND NT 49'I~
EFFE TIVE DATE QA NON-QA REVIEWED BY:
9004200haf 9004i0 PDR ADOCI( 05000244
.P PNV CATEGORY 1.0 G!NNA STATION START:
DATE TIME COMPLETED:
DATE TIME:
I 5Q f, v'~
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 2 of 32 A.
PURPOSE This procedure provides actions to mitigate and minimize a loss of secondary coolant from both steam generators.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
ENTRY CONDITIONS This procedure is entered from:
a.
E-2, FAULTED STEAM GENERATOR ISOLATION, when an uncontrolled depressurization of both steam generators occurs.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 3 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION o
IF ANY S/G PRESSURE INCREASES AT ANY TIME DURING THIS PROCEDURE, THEN E-2, FAULTED STEAM GENERATOR ISOLATION, SHOULD BE PERFORMED.
o WHEN BAST LEVEL DECREASES TO 10X, THEN SI PUMP AUTOMATIC SWITCHOVER TO RWST SHOULD BE ENSURED.
o IP THE TDAFW PUMP IS THE ONLY AVAILABLESOURCE OF PEED FLOW, THEN STEAM SUPPLY TO THE TDAPW PUMP MUST BE MAINTAINED FROM ONE S/G.
NOTE:
o FOLDOUT page should be open AND monitored periodically.
o Conditions should be evaluated for Site Contingency Reporting (Refer to SC-100, GINNA STATION EVENT EVALUATION AND CLASSIFICATION).
o Adverse CNMT values should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10-
~ R/hr.
1 Check Secondary Pressure Boundary:
o MSIVs -
CLOSED o
MFW flow control valves CLOSED
~
MPW regulating valves
~
MFW bypass valves o
MFW pump discharge valves-CLOSED o
S/G blowdown and sample valves-CLOSED o
TDAFW pump steam supply valves-PULL STOP o
TDAFW pump flow control valves-CLOSED o
S/G ARVs -
CLOSED o
Dispat'ch AO to locally isolate S/Gs (Refer to Attachment PAULTED S/G)
Manually close valves one loop at a time.
IF valves can NOT be closed, THEN dispatch AO to locally isolate flowpaths, as necessary, one loop at a time.
0
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 4 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION A MINIMUM FEED FLOW OF 50 GPM MUST BE MAINTAINED TO EACH S/G WITH A NARROV RANGE LEVEL LESS THAN 5X [25X ADVERSE CNMT].
2 Control Feed Flow To Minimize RCS Cooldown:
a.
Check cooldown rate in RCS cold legs - LESS THAN 100'F/HR
- b. Check narrow range level in both S/Gs - LESS THAN 50X a.
Decrease feed flow to 50 gpm to each S/G and go to Step 2c.
- b. Control feed flow to maintain narrow range level less than 50X in both S/Gs.
- c. Control feed flow or dump steam to stabilize RCS hot leg temperatures.
3 Check If RCPs Should Be Stopped:
a.
RCP status
- ANY RCP RUNNING
- b. SI pumps
- AT LEAST TWO RUNNING c.
RCS pressure minus maximum S/G pressure
- LESS THAN 175 psig f400 psig adverse CNMT)
- d. Stop both RCPs a.
Go to Step 4.
b.
Go to Step 4.
c.
Go to Step 4.
4 Check CST Level GREATER THAN 5 FEET Switch to alternate AFV suction supply (Refer to ER-AFV.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 5 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF ANY PRZR PORV OPENS BECAUSE OF HIGH PRZR PRESSURE, IT SHOULD BE CLOSED AFTER PRESSURE DECREASES TO LESS THAN 2335 PSIG (REFER TO STEP 5b).
5 Check PRZR PORVs And Block Valves:
a.
Power to PORV block valves-AVAILABLE b.
PORVs - CLOSED
- c. Block valves - AT LEAST ONE OPEN
- a. Restore power to block valves unless block valve was closed to isolate an open PORV:
~ MOV-515, MCC C position 6C
~ MOV-516, MCC D position 6C
- b. IF PRZR pressure less than 2335 psig, THEN manually close PORVs.
IF any PORV can NOT be closed, THEN manually close its block valve.
IF block valve can NOT be closed, THEN dispatch AO to locally check breaker.
~ MOV-515, MCC C position 6C
~ MOV-516, MCC D position 6C c.
Open one block valve unless it was closed to isolate an open PORV.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 6 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6
Check Secondary Radiation Levels NORMAL o
Steamline radiation monitor (R-31 and R-32) o Dispatch AO to locally check steamline radiation o
Request HP sample'/Gs for activity Go to E-3, STEAM GENERATOR TUBE
- RUPTURE, Step 1.
CAUTION o
RCS PRESS SHOULD BE MONITORED.
IF RCS PRESS DECREASES TO LESS THAN 250 PSIG [465 PSIG ADVERSE CNMT],'HE RHR -PUMPS MUST BE MANUALLYRESTARTED TO SUPPLY VATER TO THE RCS.
o IP OPPSITE POWER IS LOST AFTER SI RESET, SELECTED SV PUMPS AND ONE CCW PUMP VILL AUTO START ON EMERGENCY D/G.
MANUAL ACTION VILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.
7 Reset SI 8
Check If RHR Pumps Should Be Stopped:
a.
Check RCS Pressure:
- 1) Pressure
- GREATER THAN 250 psig [465 psig adverse CNMT]
- 2) Pressure
- STABLE OR INCREASING
- b. Stop RHR pumps and place in AUTO 1)
Go to E-l, LOSS OP REACTOR OR SECONDARY COOLANT, Step l.
2)
Go to Step 9.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 7 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 9
Check If CNMT Spray Should Be Stopped:
a.
CNMT spray pumps
- RUNNING
- b. Verify CNMT pressure
- LESS THAN 4 PSIG
- c. Reset CNMT spray d.
Check NaOH tank outlet valves-CLOSED
~ AOV-836A
~ AOV-836B a.
Go to Step 10.
- b. Continue with Step 10.
WHEN CNMT pressure less than 4 psig, THEN do Steps 9c through f.
- d. Place NaOH tank outlet valve controllers to MANUAL and close valves.
~ AOV-836A
~ AOV-836B e.
Stop CNMT spray pumps and place in AUTO
- f. Close CNMT spray pump discharge valves
~ MOV-860A
~ MOV-860B
~ MOV-860C
~ MOV-860D 10 Check RWST Level GREATER THAN 28~o Go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.
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ECA-2.1 UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 8 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 11 Check If SI ACCUMs Should Be Isolated:
- a. Both RCS hot leg temperatures-LESS THAN 400'P a.
Go to Step 12.
~ MOV-841, MCC C position 12P
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ MOV-841
~ MOV-865
- d. Locally reopen breakers for MOV-841 and MOV-865
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs,
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
12 Reset CI:
- a. Operate CI reset key switch
- b. Verify annunciator A-26, CNMT ISOLATION - EXTINGUISHED
- b. Perform the following:
- 1) Reset SI.
- 2) Operate CI reset key switch.
e
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REVS 5
PAGE 9 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Verify Adequate SW Flow:
a.
Check at least two SW pumps-RUNNING
- b. Dispatch AO to establish normal shutdown alignment (Refer to Attachment SD-1)
- a. Manually start SV pumps as power supply permits (258 kw each).
IP less than two SV pumps
- running, THEN perform the following:
- 1) Ensure SV isolation.
- 2) Dispatch AO to establish normal shutdown alignment (Refer to Attachment SD-1) 3)
Go to Step 15.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 10 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 14 Establish IA to CNMT:
- a. Verify non-safeguards busses energized from offsite power o
Bus 13 normal feed -
CLOSED
-OR-o Bus 15 normal feed - CLOSED
- b. Verify SW isolation valves to turbine building -
OPEN
~ MOV-4613 and MOV-4670
~ MOV-4614 and MOV-4664
- c. Verify at least two air compressors
- RUNNING
- d. Check IA supply:
o Pressure
- GREATER THAN 60 PSIG o
Pressure STABLE OR INCREASING
- a. Perform the following:
- 1) Close non-safeguards bus tie breakers:
~ Bus 13 to Bus 14 tie
~ Bus 15 to Bus 16 tie
- 2) Verify adequate emergency D/G capacity to run air compressors (75 kw each).
IF NOT, THEN evaluate if CNMT RECIRC fans should be stopped (Refer to Attachment CNMT RECIRC FANS).
3)
WHEN bus 15 restored, THEN reset control room lighting.
- b. Manually align valves.
- c. Manually start air compressors as power supply permits (75 kw each).
IF air compressors can NOT be started, THEN dispatch AO to locally reset compressors as necessary.
- d. Perform the following:
- 1) Continue attempts to restore IA (Refer to AP-IA.l, LOSS OF INSTRUMENT AIR).
2), Continue with Step 15.
WHEN IA restored, THEN do Steps 14e and f.
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 11 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 15 Check Normal Power Available To Charging Pumps:
o Bus 14 normal feed breaker-CLOSED o
Bus 16 normal feed breaker-CLOSED Verify adequate emergency D/G capacity to run charging pumps (75 kv each).
IF NOT, THEN evaluate if CNMT RECIRC fans can be stopped (Refer to Attachment CNMT RECIRC PANS).
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ECA-2.1 T1TLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV' PAGE 12 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 16 Check If Charging Flow Has Been Established:
- a. Charging pumps - ANY RUNNING
- b. Align charging pump suction to RWST:
o LCV-112B -
OPEN o
LCV-112C - CLOSED a.
Perform the following:
- 1) IR CCW flow is lost to any RCP thermal barrier OR any RCP fl seal outlet temperature offscale high, THEN dispatch AO with key to RWST gate to close seal in)ection needle valve(s) to affected RCP:
~ RCP A, V-300A
~ RCP B, V-300B
- 2) Ensure HCV-142 open, demand at 0%.
- b. IR LCV-112B can NOT be opened, THEN perform the following:
- 1) Verify charging pump A NOT running and place in PULL STOP.
- c. Start charging pumps as necessary and ad)ust charging flow to restore PRZR level
- 2) Dispatch AO to locally open manual charging pump suction from RWST (V-358 located in charging pump room).
3)
WHEN V-358 open, THEN direct AO to close V-268 to isolate charging pumps B and C from VCT (V-268 located in charging pump room).
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 13 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 17 Check If SI Should Be Terminated:
a.
Check RCS pressure:
o Pressure
- GREATER THAN 1625 psig [1825 psig adverse CNMT]
o Pressure STABLE OR INCREASING b.
RCS subcooling based on core exit T/Cs - GREATER THAN O'P USING FIGURE MIN SUBCOOLING c.
PRZR level - GREATER THAN 5X
[30X adverse CNMT]
a.
DO NOT stop SI pumps.
Perform the following:
- 1) Energize PRZR heaters and operate PRZR spray as necessary to stabilize RCS pressure greater than 1625 psig [1825 psig adverse CNMT]
- 2) Return to Step 2.
b.
DO NOT stop SI pumps.
Return to Step 2.
c.
Do NOT stop SI pumps.
Perform the following:
- 1) IP normal PRZR spray available, THEN try to stabilize RCS pressure with PRZR spray.
- 2) Return to Step 17a.
18 Stop SI and RHR Pumps And Place In Auto
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ECA-2.1 UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 14 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 19 Verify SI Flow Not Required:
a.
RCS.subcooling based on core exit T/Cs - GREATER THAN O' USING FIGURE MIN SUBCOOLING b.
PRZR level - GREATER THAN 5X
[30X adverse CNMT]
- a. Manually operate SI pumps as necessary and return to Step 2.
b.,Control charging flow to maintain PRZR level.
IF PRZR level can NOT be maintained, THEN manually operate SI pumps as necessary and return to Step 2.
C
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 15 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION ALIGNING SI PUMP SUCTION TO RWST BEFORE ISOLATING BAST MAY RESULT IN BACKFLOW PROM RWST TO BASTS.
20 Verify SI Pump Suction Aligned To RWST:
a.
SI pump suction valves from BASTs - CLOSED
~ MOV-826A
~ MOV-826B
~ MOV-826C
~ MOV-826D
~ MOV-825A
~ MOV-825B
- a. Manually close at least one valve in each flow path.
~ MOV-826A or MOV-826B
~ MOV-826C or MOV-826D IP either flowpath can NOT be manually isolated, THEN dispatch AO to isolate flowpath locally.
- b. Ensure at least one valve is open.
21 Check RCS Hot Leg Temperatures STABLE OR DECREASING Control feed flow or dump steam to stabilize RCS hot leg temperatures.
22 Check Narrow Range Level In Both S/Gs LESS THAN 504 Control feed flow. to maintain narrow range level less than 50X in both S/Gs.
I l'
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV' PAGE 16 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 23 Verify Adequate SW Flow To CCW Hx:
- a. Verify at least two SW pumps-RUNNING
- b. Verify AUX BLDG SW isolation valves OPEN
~ MOV-4615 and MOV-4734
~ MOV-4616 and MOV-4735
- a. Manually start pumps as power supply permits (258 kw per pump).
IP less than two SW pumps can be operated, THEN go to Step 30.
- c. Verify CNMT RECIRC fan annunciator C-2, HIGH TEMPERATURE ALARM - EXTINGUISHED
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 17 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 24 Check If Normal CVCS Operation Can Be Established
- a. Verify IA restored:
OPEN o
IA pressure
- GREATER THAN 60 PSIG
- b. Verify instrument bus D-ENERGIZED c.
CCW pumps - ANY RUNNING
- d. Charging pump - ANY RUNNING
- a. Continue with Step 30.
WHEN IA
- restored, THEN do Steps 24 through 29.
- b. Energize MCC B.
IF MCC B NOT available, THEN perform the following:
- 1) Verify MCC A energized.
- 2) Place instrument bus D on maintenance supply.
- c. Perform the following:
- 1) IF any RCP $ 1 seal outlet temperature offscale high, THEN isolate CCW to thermal barrier of affected RCP(s).
~ RCP A, MOV-749A and MOV-759A
~ RCP B, MOV-749B and MOV-759B
- 2) Manually start one CCW pump.
- d. Continue with Step 30.
WHEN any charging pump running, THEN do Steps 25 through 29.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM
'GENERATORS REV:
5 PAGE 18 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 25 Check If Seal Return Flow Should Be Established:
- a. Verify RCP fl seal outlet temperature LESS THAN 235'F
- b. Verify RCP seal outlet valves-OPEN
~ AOV-270A
~ AOV-270B a.
Go to Step 28.
- b. Manually open valves as necessary.
- c. Reset both trains of XY relays for RCP seal return isolation valve MOV-313 d.
Open RCP seal return isolation valve MOV-313
- e. Verify RCP fl seal leakoff flow
- LESS THAN 5.5 GPM
- f. Verify RCP fl seal leakoff flow
- GREATER THAN 0.25 GPM
- d. Perform the following:
- 1) Place MOV-313 switch to OPEN.
- e. IF any RCP seal leakoff flow greater than 5.5 gpm THEN:
o Close the affected RCP seal discharge valve
~ RCP A, AOV-270A
~ RCP B, AOV-270B o
Trip the affected RCP IF both RCP seal discharge valves are shut, THEN go to Step 27.
- f. Refer to AP-RCP.1, RCP SEAL MALFUNCTION.
t
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 19 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 26 Verify PRZR Level GREATER THAN 13'40+o adverse CNMT]
Continue with Step 28.
@HEN PRZR level increases to greater than 13%
[40% adverse CNMT], THEN do Step 27.
27 Establish Normal Letdown:
- a. Verify charging line flow to REGEN Hx - GREATER THAN 20 GPM
- b. Place the following switches to CLOSE:
~ Letdown orifice valves (AOV-200A, AOV-200B, and AOV-202)
~ AOV-371, letdown isolation valve
~ AOV-427, loop B cold leg to REGEN Hx
- c. Place letdown controllers TCV-130 and PCV-135 in MANUAL at 25% open
- d. Reset both trains of XY relays for AOV-371 and AOV-427 e.
Open AOV-371 and AOV-427
- f. Open letdown orifice valves as necessary
- g. Place TCV-130 in AUTO at 105'F
- h. Place PCV-135 in AUTO at 250 psig
- i. Adjust charging pump speed and HCV-142 as necessary IF RCP seal return has been established, THEN establish excess letdown as follows:
o Place excess letdown divert
- valve, AOV-312, to NORMAL.
o Ensure CCW from excess letdown
- open, (AOV-745).
o Open excess letdown isolation valve AOV-310.
o Slowly open HCV-123 to maintain excess letdown temperature less than 195'F and pressure less than 100 psig.
o Adjust charging pump speed as necessary.
XF RCP seal return NOT established, THEN consult TSC to determine if excess letdown should be placed in service.
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5 PAGE 20 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 28 Check VCT Makeup System:
a.
BAST levels - ANY GREATER THAN 5X a.
Go to Step 29.
'. Check Annunciator B-23,'ORIC ACID TANK LO LO LEVEL-EXTINGUISHED
- b. Perform the following:
- 1) Ad]ust boric acid flow control valve to'required flow from table.
BAST LEVEL
<10X 10-15X 15-20X
>20X BORIC ACID FLOW (GPM) 4.5 6.7 8.9 10.0
- c. Ad]ust boric acid flow control valve in AUTO to 4.5 gpm
- d. Verify the following:
1)
RMV mode selector switch in AUTO 2)
Go to Step 28d.
- d. Adjust controls as necessary.
2)
RMW control armed
- RED LIGHT LIT e.
Check VCT.level:
o Level - GREATER THAN 20X
-OR-o Level - STABLE OR INCREASING
- e. Manually increase VCT makeup flow as follows:
- 1) Ensure BA transfer pumps and RMV pumps running.
IF NOT, THEN reset MCC C and MCC D UV lockouts as necessary.
- 2) Place RMV flow control valve HCV-ill in MANUAL and'ncrease RMW flow.
- 3) Increase boric acid flow as necessary.
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5 PAGE 21 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 29 Check Charging Pump Suction Aligned To VCT:
a.
VCT level - GREATER THAN 20X
- a. IF VCT level can NOT be maintained greater than 5X, THEN perform the following:
- 1) Ensure charging pump suction aligned to RUST o
LCV-112B open o
LCV-112C closed
- b. Verify charging pumps aligned to VCT:
o LCV-112C -
OPEN o
LCV-112B -
CLOSED
- 2) Continue with Step 30.
VHEN.
VCT level greater than 40X, THEN do Step 29b.
- b. Manually align valves as necessary.
NOTE:
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
o
@hen using PRZR PORV, select one with an operable block valve.
30 Energize Heaters And Operate Normal Spray As Necessary To Maintain RCS Pressure Stable IF normal spray NOT available and letdown is in service, THEN use auxiliary spray valve (AOV-296).
IF PRZR spray NOT available, THEN use one PRZR PORV.
IF IA NOT available, THEN refer to Attachment N2 PORVS.
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 22 of 32 STEP ACTION/EZPECTED RESPONSE
RESPONSE
NOT OBTAINED 31 Check RCP Cooling:
a.
o Annunciator A-7, RCP 1A CCW RETURN HIGH TEMP OR LOW FLOW
- EXTINGUISHED o
Annunciator A-15, RCP 1B CCW RETURN HIGH TEMP OR LOW FLOW
- EXTINGUISHED Establish normal cooling to RCPs (Refer to Attachment SEAL COOLING).
- b. Check RCP seal in)ection:
o Labyrinth seal D/Ps - GREATER THAN 15 INCHES OF WATER
-OR-o RCP seal injection flow to each RCP - GREATER THAN 6 GPM
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5 PAGE 23 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 32 Verify All AC Busses ENERGIZED BY OFFSITE POWER o
Normal feed breakers to all 480 volt busses CLOSED o
480 bus voltage - GREATER THAN 420 VOLTS o
Emergency D/G output breakers-OPEN Perform the following:
- a. IF any AC emergency bus normal feed breaker
- open, THEN ensure associated D/G breaker closed.
- b. Perform the following, as necessary:
- 1) Close non-safeguards bus tie breakers:
~ Bus 13 to Bus 14 tie
~ Bus 15 to Bus 16 tie
- 2) Place the following pumps in PULL STOP:
~ EH pumps
~ Turning gear oil pump
~ HP seal oil backup pump
- 3) Restore power to MCCs.
~ A from Bus 13
~ B from Bus 15
~ E from Bus 15
~ F from Bus 15 4)
WHEN bus 15 restored, THEN reset control room lighting.
- 5) Refer to Attachment SI/UV for other equipment lost with loss of offsite power.
- c. Try to restore offsite power to all AC busses (Refer to ER-ELEC.1, RESTORATION OF OFFSITE POWER).
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 24 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF RCP SEAL COOLING HAD PREVIOUSLY BEEN LOST, THEN THE AFFECTED RCP SHOULD NOT BE STARTED PRIOR TO A STATUS EVALUATION.
33 Check RCP Status AT LEAST ONE RUNNING
/
Try to start one RCP:
- a. Establish conditions for starting an RCP.
o Bus llA or 11B energized o
Refer to Attachment RCP START.
- b. Start one RCP.
IF an "RCP can NOT be started, THEN verify natural circulation (Refer to Attachment NC).
IF natural circulation can NOT be
- verified, THEN increase feed flow or dumping steam.
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 25 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Adverse CNMT conditions or loss of forced air cooling may result in failure of NIS detectors.
34 Check If Source Range Detectors Should Be Energized:
a.
Source range channels-DEENERGIZED a.
Go to Step 34e.
- b. Check intermediate range flux-EITHER CHANNEL LESS THAN 10-xo AMPS
- b. Perform the following:
- 1) IF neither intermediate range channel is decreasing THEN initiate boration.
- c. Check the following:
o Both intermediate range channels
- LESS THAN 10-~o AMPS
- 2) Continue with Step 35.
WHEN flux is LESS THAN 10-'~ amps on any operable
- channel, THEN do Steps
- 34c, d and e.
- c. Continue with step 35.
VHEN either condition met, THEN do Steps 34d and e.
-OR-o Greater than 20 minutes since reactor trip
- d. Verify source range detectors-ENERGIZED
- d. Manually energize source range detectors by depressing P-6 permissive defeat pushbuttons (2
of 2).
- e. Transfer Rk-45 recorder to one source range and one intermediate range channel.
IF source ranges can NOT be
- restored, THEN refer to ER-NIS.1, SR MALFUNCTION and go to Step 35.
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ECA-2.1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 26 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 35 Check If Emergency D/Gs Should Be Stopped:
/
- a. Verify AC emergency busses energized by offsite power:
o Emergency D/G output breakers OPEN
- a. Try to restore offsite power (Refer to ER-ELEC.l, RESTORATION OF OFFSITE POWER).
o AC emergency bus voltage-GREATER THAN 420 VOLTS o
AC emergency bus normal feed breakers
- CLOSED
- b. Stop any unloaded emergency D/G and place in standby (Refer to Attachment D/G STOP)
0 I
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 27 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 36 Establish Normal Shutdown Alignment:
a.
Check condenser
- AVAILABLE
- b. Perform the following:
o Open generator disconnects
~ 1G13A71
~ 9X13A73
- a. Dispatch AO to perform Attachment SD-2.
o Place voltage regulator to OFF o
Open turbine drain valves o
Rotate reheater steam supply controller cam to close valves o
Place reheater dump valve switches to HAND o
Stop all but one condensate pump
- c. Verify adequate Rx head cooling:
- 2) Verify at least one control rod shroud fan - RUNNING
- 3) Verify one Rx compartment cooling fan - RUNNING
- d. Verify Attachment SD COMPLETE 1)
Go to Step 37.
- 2) Manually start one fan as power supply permits (45 kw)
- 3) Perform the following:
o Dispatch AO to reset UV relays at MCC C and MCC D.
o Manually start one fan as power supply permits (23 kw)
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ECA-2. 1 TITLE:
UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 28 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 37 Maintain Plant Conditions STABLE Control plant systems as necessary to maintain conditions stable.
o RCS pressure o
PRZR level o
RCS temperatures il 38 Verify SI Flow Not Required:
a.
RCS subcooling based on core exit T/Cs - GREATER THAN O' USING FIGURE MIN SUBCOOLING
- a. Manually operate SI pumps as necessary.
Return to Step 2.
b.
PRZR level - GREATER THAN 5%
[30% adverse CNMT]
- b. Control charging flow to maintain PRZR level.
IF PRZR level can NOT be maintained, THEN manually operate SI pumps as necessary.
Return to Step 2.
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 29 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 39 Check If SI ACCUMs Should Be Isolated:
a.
Check the following:
o RCS subcooling based on core exit T/Cs - GREATER THAN O' USING FIGURE MIN SUBCOOLING a.
Go to Step 40.
o PRZR level - GREATER THAN 5X
[30X adverse CNMT]
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ MOV-841
~ MOV-865
- d. Locally reopen breakers for MOV-841 and MOV-865
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs.
~ ACCUM A, AOV-834A
~ ACCUM B, AOV-834B
- 2) Open HCV-945.
40 Check RCS Hot Leg Temperatures LESS THAN 350'F Control feed flow and dump steam to establish RCS cooldown rate less than 100'F/hr in RCS cold legs.
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 30 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
o If auxiliary spray is in use, spray flow may be increased by closing normal charging valve AOV-294 and normal PRZR spray valves.
o When using PRZR PORV, select one with operable block valve.
41 Check RCS Pressure LESS THAN 400 PSIG
[300 PSIG adverse CNMT]
Use normal PRZR spray.
IF normal spray NOT available and letdown is in service, THEN use auxiliary spray.
IF NOT, THEN use one PRZR PORV.
IF IA NOT available, THEN refer to Attachment N2 PORVS.
0
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5 PAGE 31 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 42 Check If RHR Normal Cooling Can Be Established:
a.
RCS cold leg temperature
- LESS THAN 350'F
- a. Return to Step 38.
b.
RCS pressure LESS THAN 400 psig [300 psig adverse CNMT]
- c. Place letdown pressure controller (PCV-135) in MANUAL CLOSED F
- b. Return to Step 41.
- d. Check following valves - OPEN
~ AOV-371, letdown isolation valve
~ AOV-427, loop B cold leg to REGEN Hx
~ At least one letdown orifice valve (AOV-'200A, AOV-200B, or AOV-202)
- d. Perform the following:
- 1) Reset both trains of XY relays for AOV-371 and AOV-427.
- 2) Open AOV-371 and AOV-427.
3)
Open one letdown orifice valve.
- e. Verify pressure on PI-135 - LESS
- e. Return to Step 41.
THAN 400 PSIG
- f. Place RCS overpressure protection system in" service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)
- f. IF RCS overpressure protection system can NOT be placed in
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5 PAGE 32 of 32 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 43 Continue RCS Cooldown To Cold Shutdown:
- a. Maintain cooldown rate in RCS cold legs
- LESS THAN 100'F/HR b.
Check narrow range level in both S/Gs - LESS THAN=50X
- b. Control feed flow to maintain narrow range level less than 50X in both S/Gs.
44 Check Core Exit T/Cs LESS THAN 200'F Return to Step 43.
45 Evaluate Long Term Plant Status:
- a. Maintain cold shutdown conditions
- b. Consult TSC
-END-
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ECA-2.1 TITLE UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV:
5 PAGE 1 of 1 ECA-2.1 APPENDIX LIST TITLE PAGES 1)
RED PATH
SUMMARY
2)
FIGURE MIN SUBCOOLING 3)
ATTACHMENT FAULTED S/G 4)
ATTACHMENT CNMT RECIRC FANS 5)
ATTACHMENT NC 6)
ATTACHMENT RCP START 7)
ATTACHMENT N2 PORVS 8)
ATTACHMENT SEAL COOLING 9)
ATTACHMENT SI/UV 10)
ATTACHMENT D/G STOP 11)
ATTACHMENT SD-1 12)
ATTACHMENT SD-2 13)
ATTACHMENT RHR COOL 14)
ATTACHMENT AUX BLDG SW 15)
ATTACHMENT SI FLUSH 16)
FOLDOUT
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5 PAGE 1 of 1 RED PATH
SUMMARY
a.
SUBCRITICALITY Nuclear power greater than 54 b.
CORE COOLING Core exit T/Cs greater than 1200'F
-OR-Core exit T/Cs greater than 700'F AND RVLIS level (no RCPs) less than 434
[464 adverse CNMT]
c.
HEAT SINK Narrow range level in all S/Gs less than 54
[254 adverse CNMT] AND total feedwater flow less than 200 gpm d.
INTEGRITY Cold leg temperatures decrease greater than 100'F in last 60 minutes AND RCS cold leg temperature less than 285'F e.
CONTAINMENT CNMT pressure greater than 60 psig
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 1 of 1 FIGURE MIN SUBCOOLING NOTE:
Subcooling Margin = Saturation Temperature From Figure Below [-] Core Exit T/C Indication RC 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0
20 S
PRESSURE (PSIG)
RCS PRESSURE INCREMENTS 20 PSIG SUBCOOLED REGION INADEQUATE SUBCOOLING REGION DVERSE CNMT TEMPERATURE INCREMENTS 10'F NORMAL CNMT 0
250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE ('F)
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UNCONTROLLED DEPRESSURIZATION OF BOTH STEAM GENERATORS REV 5
PAGE 1 of 1 FOLDOUT PAGE 1.
SI REINITIATION CRITERIA Manually operate SI pumps as necessary if EITHER condition listed below occurs:
o RCS subcooling based on core exit TCs LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING o
PRZR level CHARGING CAN NOT, CONTROL LEVEL GREATER THAN 54
[30~o ADVERSE CNMT]
2.
E-2 TRANSITION CRITERIA IF any S/G pressure increases at any time, THEN go to E-2, FAULTED STEAM GENERATOR ISOLATION, Step 1.
I I
3.
COLD LEG RECIRCULATION SWITCHOVER CRITERION IF RWST level decreases to less than 284, THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.
I 4.
AFW SUPPLY SWITCHOVER CRITERION IF CST level decreases to less than 5 feet, THEN switch to alternate AFW water supply (Refer to ER-AFW.l, ALTERNATE WATER SUPPLY TO AFW PUMPS).
5.
SI PUMP AUTO SWITCHOVER CRITERION WHEN BAST level decreases to 10>,
THEN ensure SI pump automatic switchover to RWST.
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