ML17263A274
| ML17263A274 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/21/1993 |
| From: | Marlow T ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17263A269 | List: |
| References | |
| FR-P.1, NUDOCS 9305140055 | |
| Download: ML17263A274 (50) | |
Text
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FR-P. 1 TITLE:
RESPONSE
TO IMMINENT PRESSURIZED THERMAL SHOCK CONDITION REV:
7 PAGE 1 of 22 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE f PLANT SUPERINTENDENT EFFECTIVE DATE CATEGORY 1.0 REVIEWED BY:
9305140055 930505 PDR ADOCK 05000244 F
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FR-P. 1 TITLE
RESPONSE
TO IMMINENT PRESSURIZED THERMAL SHOCK CONDITION REV:
7 PAGE 2 of 22 A.
PURPOSE This procedure provides actions to avoid, or limit, thermal shock or pressurized thermal shock to the reactor pressure
- vessel, or overpressure conditions at low temperature.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
ENTRY CONDITIONS This procedure is entered from:
a.
F-0.4, INTEGRITY Critical Safety Function Status
- Tree, on either a
RED or ORANGE condition.
8
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PAGE 3 of 22 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Adverse CNKZ values should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10+"
R/hr.
1 Check RCS Pressure GREATER THAN 250 PSIG
[465 PSIG adverse CNMT]
IF RHR flow greater than 475
- gpm, THEN return to procedure and step in effect.
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7 PAGE 4 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED NOTE:
A faulted S/G is any S/G that is depressurizing in an uncontrolled manner or is completely depressurized.
2 Check RCS Cold Leg Temperatures STABLE OR INCREASING Try to stop RCS cooldown:
a.
Ensure S/G ARVs closed.
- b. Close both S/G MSIVs.
- c. Ensure MFW flow control valves closed.
~ MFW regulating valves
~ MFW bypass valves
- d. Ensure MFW pumps tripped.
- e. Rotate reheater steam supply controller cam to close reheater steam supply valves.
- f. IF S/G pressure le'ss than condensate
- pressure, THEN stop all condensate pumps.
- h. Control total feed flow to non-faulted S/G(s) greater than 200 gpm until narrow range level greater than 5%
[25% adverse CNMT] in at least one non-faulted S/G.
WHEN S/G level greater than 5%
[25% adverse CNMT) in one non-faulted S/G, THEN limit feed flow to stop RCS cooldown.
This Step continued on the next page.
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7 PAGE '5 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED (Step 2 continued from previous page)
- i. Minimize cooldown from faulted S/G(s):
- 1) Close faulted S/G(s)
TDAFW pump steam supply valve(s).
~ S/G A, MOV-3505A
~ S/G B, MOV-3504A
- 2) IF both S/G(s) faulted, THEN control feed flow at 50 gpm to each S/G.
')
IF any S/G NOT faulted, THEN isolate all feedwater to faulted S/G unless necessary for RCS temperature control.
IF a faulted S/G is necessary for RCS temperature
- control, THEN control feed flow at 50 gpm to that S/G.
3 Check PRZR PORV Block Valves:
a.
Power to PORV block valves AVAILABLE
- a. Restore power to block valves unless block valve was closed to isolate an open PORV:
- b. Block valves
- AT LEAST ONE OPEN r
~ MOV-515, MCC C position 6C
~ MOV-516, MCC D position 6C b.
Open one block valve unless it was closed to isolate an open PORV.
IF at least one block valve can NOT be opened, THEN dispatch AO to locally check breaker.
~ MOV-515, MCC C position 6C
~ MOV-516, MCC D position 6C
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7 PAGE 6 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED CAUTION IF ANY PRZR PORV OPENS BECAUSE OF HIGH PRZR PRESSURE, THEN STEP 4 SHOULD BE PERFORMED AFTER PRESSURE DECREASES TO LESS THAN THE APPLICABLE PORV SETPOINT 4 Check PRZR PORV Status:
a.
Check Reactor Vessel Overpressure Protection System-IN SERVICE a.
Go to Step 4d.
b.
Check RCS pressure LESS THAN 410 PSIG
- b. Perform the following:
- 1) Ensure at least one PRZR PORV open.
- 2) Continue with Step 5.
WHEN pressure less than setpoint, THEN do Step 4e.
c.
Go to Step 4e d.
PRZR pressure
- LESS THAN 2335 PSIG
- d. Perform the following:
- 1) Ensure at least one PRZR PORV open.
- e. Verify PRZR PORVs CLOSED
- 2) Continue with, Step 5.
WHEN pressure less than setpoint, THEN do Step 4e.
- e. Manually close valve.
IF any valve can NOT be closed,'HEN manually close its block valve.
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7 PAGE 7 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 5
Check SI Pumps ANY RUNNING Go to S tep 14.
6 Check If SI Can Be Terminated:
o RCS subcooling based on core exit T/Cs GREATER THAN 50'F USING FIGURE MIN SUBCOOLING o
Check RVLIS indication':
o Level (no RCPs)
GREATER THAN 688
[73% adverse CNMT]
-OR-o Fluid fraction (any RCP running)
GREATER THAN 80%
Do NOT stop SI pumps.
Perform the following:
- a. IF RCS subcooling based on core exit T/Cs greater than O'F using Figure MIN SUBCOOLING and no RCP
- running, THEN attempt to start an RCP:
- 1) Establish conditions for starting an RCP:
o Bus 11A or 11B energized o
Refer to Attachment RCP START
- 2) IF conditions established, THEN start one RCP.
b.
Go to Step 27 '
CAUTION IF OFFSITE POWER IS LOST AFTER SI RESET, THEN SELECTED SW'PUMPS AND ONE CCW PUMP WILL AUTO START ON EMERGENCY D/G.
MANUAL ACTION WILL BE REQUIRED TO RESTART SAFEGUARDS EQUIPMENT.
7 Reset SI
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7 PAGE 8 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 8 Stop SI And RHR Pumps And Place In AUTO 9 Reset CI:
a.
Depress CI reset pushbutton
- b. Verify annunciator A-26, CNMT ISOLATION - EXTINGUISHED
- b. Perform the following:
- 1) Reset SI.
- 2) Depress CI reset pushbutton.
10 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 SW pumps as power supply permits (258 kw each).
IF less than two SW pumps
- running, THEN perform the following:
- 1) Ensure SW isolation.
- 2) Dispatch AO to establish normal shutdown alignment (Refer to Attachment SD-1).
3)
Go to Step 12.
WHEN adequate SW available, THEN do Step 11.
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7 PAGE 9 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 11 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'ompressors
- RUNNING d.
Check IA supply:
o Pressure
- GREATER THAN 60 PSIG o
Pressure
- STABLE OR INCREASING
OPEN 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.1, LOSS OF INSTRUMENT AIR).
- 2) Continue with Step 12.
WHEN IA restored, THEN do Steps lie and f.
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7 PAGE 10 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED CAUTION ALIGNING SI PUMP SUCTION TO RWST BEFORE ISOLATING BAST MAY RESULT IN BACKFLOW FROM RWST TO BASTS.
12 Verify SI Pump Suction Aligned To RWST:
- a. SI pump suction valves from BASTs -
CLOSED
~ MOV-826A
~ MOV-826B
~ MOV-826C
~ MOV-826D a.
Ensure at least one valve in each flow path closed.
~ MOV-826A or MOV-826B
~ MOV-826C or MOV-826D
~ MOV-825A
~ MOV-825B b.
Ensure at least one valve is open.
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FR-P.1 TITLE:
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7 PAGE 11 of 22 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Check If Charging Flow Has Been Established:
a.
Charging-pumps
- ANY RUNNING a.
Perform the following:
- 1) IF CCW flow is lost to any RCP thermal barrier OR any RCP ¹1 seal outlet temperature offscale high, THEN dispatch AO with key to RWST gate to locally close seal injection needle valve(s) to affected RCP:
~ RCP A, V-300A
~ RCP B, V-300B
- 2) Ensure HCV-142 open, demand at '0%.
- b. Align charging pump suction to RWST' LCV-112B -
OPEN o
LCV-112C -
CLOSED
- b. IF 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 adjust 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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7 PAGE 12 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED
- 14 Monitor SI Reinitiation Criteria:
o RCS subcooling based on core exit T/Cs - GREATER THAN FIGURE MIN SUBCOOLING o
RVLIS indication:
Manually operate SI pumps as necessary and perform the following:
- running, THEN attempt to start a
RCP' Level - GREATER THAN 68%
[738 adverse CNMT]
-OR-o Fluid fraction (any RCP running)
GREATER THAN 80%
- 1) Establish conditions for starting an RCP:
o Bus llA or 11B energized o
Refer to Attachment RCP START
- 2) IF conditions established, THEN start one RCP.
~ b.
Go to Step 27.
15 Check RCS Hot Leg Temperatures STABLE IF 'increasing, THEN control feed flow and dump steam to stabilize RCS hot leg temperatures.
IF decreasing, THEN verify that actions of Step 1 have been performed before continuing with procedure.
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7 PAGE 13 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 16 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. Return to Step 14.
o RVLIS indication:
o Level -
GREATER THAN 68%
[73% adverse CNMT]
-OR-o Fluid fraction (any RCP running)
GREATER THAN 80%
~ MOV-841, MCC C position 12F
~ MOV-865, MCC D position 12C
- c. Close SI ACCUM discharge valves
~ MOV-841
~ MOV-865
- c. Vent any unisolated ACCUMs:
- 1) Open vent valves for unisolated SI ACCUMs.
- d. Locally reopen breakers for MOV-841 and MOV-865
~ ACCUM A) AOV-834A i ACCUM B, AOV-834B
- 2) Open HCV-945.
- 3) Continue with Step 17.
Do NOT decrease RCS pressure to less than unisolated ACCUM pressure.
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7 PAGE 14 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED CAUTION THE RCS SHOULD NOT BE DEPRESSURIZED TO LESS THAN SI ACCUM PRESSURE UNTIL SI ACCUMS ISOLATED.
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 a PRZR PORV select one with an operable block valve.
17 Depressurize RCS To Decrease RCS Subcooling:
- a. Depressurize using normal PRZR spray if available
- a. IF normal spray NOT available, THEN use one PRZR PORV.
IF IA NOT available, THEN refer to Attachment N2 PORVS.
IF no PRZR PORV available, THEN use auxiliary spray valve (AOV-296).
- b. Depressurize RCS until either of the following conditions satisfied:
o RCS subcooling based on core exit T/Cs
- LESS THAN 10'F USING FIGURE MIN SUBCOOLING
-OR-o PRZR level -
GREATER THAN 87%
(75% adverse CNMT]
- c. Stop RCS depressurization
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7 PAGE 15 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 18 Check If RCPs Must Be Stopped:.
a.
- ANY RUNNING b.
Clfeck the following:
o RCP ¹1 seal D/P LESS THAN 220 PSID a.
Go to Step 19.
b.
Go to Step 19.
-OR-o RCP ¹1 seal leakoff - LESS THAN 0.25 GPM
- c. Stop affected RCP(s)
CAUTION AN INCREASE IN RCS PRESSURE MAY RESULT IN EXCESSIVE REACTOR VESSEL STRESS.
RCS PRESSURE AND TEMPERATURE SHOULD BE MAINTAINED STABLE WHILE PERFORMING SUBSEQUENT STEPS IN THIS PROCEDURE.
19 Check PRZR Level GREATER THAN 134
[40% adverse CNMT]
Try to restore level with charging while maintaining stable RCS pressure.
IF level can NOT be
- restored, THEN go to Step 26.
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7 PAGE 16 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 20 Check If Normal CVCS Operation Can Be Established
- a. Verify IA restored:
OPEN o
IA pressure GREATER THAN 60 PSIG a.
Continue with Step 24.
WHEN IA restored; THEN do Steps 20 through 23.
b.
CCW pumps
- ANY RUNNING
- c. Verify instrument bus D-
,ENERGIZED
- d. Charging pump
- ANY RUNNING
- b. Perform the following:
- 1) IF any RCP ¹1 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.
- c. 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.
- d. Continue with Step 25.
WHEN any charging pump running, THEN do Steps 21 through 25.
ii k
A
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7 PAGE 17 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED CAUTION IF RCS PRESSURE LESS THAN 250 PSIG, THEN PCV-135 SHOULD BE ADJUSTED TO ESTABLISH DESIRED LETDOWN FLOW, NOT TO INCREASE PRESSURE.
4 21 Establish Normal Letdown:
- a. Establish 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 in MANUAL at 25% open
~ TCV-130
~ PCV-135
- 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.
IF RCP seal return NOT established, THEN consult TSC to determine if excess letdown should be placed in service.
i (1
W V
V 9'
~
"4
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7 PAGE 18 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 22 Check VCT Makeup System:
a.
BAST levels
- ANY GREATER THAN 5%
b.
Check Annunicator B-23, BORIC ACID TANK LO LO LEVEL-EXTINGUISHED a.
Go to Step 23.
- b. Perform the following:
- 1) Adjust boric acid flow control valve to required flow from table.
BAST LEVEL
<10%
10-15%
15-20%
>20%
BORIC ACID FLOW (GPM) 4.5 6.7 8.9 10.0 2)
Go to Step 22d.
- c. Adjust boric acid flow control valve in AUTO to 4.5 gpm
- d. Verify the following:
1)
RMW mode selector switch in AUTO
- d. Adjust controls as necessary.
2)
RMW control armed RED LIGHT LIT e.
Check VCT. level:
o Level - GREATER THAN 20%
-OR-o, Level - STABLE OR INCREASING
- e. Manually increase VCT makeup flow as follows:
- 1) Ensure BA transfer pumps and EMH pumps running.
IF NOT, THEN reset MCC C and MCC D UV lockouts as necessary.
- 2) Place RMW flow control valve HCV-ill in MANUAL and increase RMW flow.
- 3) Increase boric acid flow as
.necessary.
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7 PAGE 19 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 23 Check Charging Pump Suction Aligned To VCT:
a.
VCT level - GREATER THAN 20%
- a. IF VCT level can NOT be maintained great'er than 5%,
THEN perform the following:
- 1) Ensure charging pump suction aligned to RWST o
LCV-112B open o'CV-112C closed
- 2) Continue with Step 24.
WHEN VCT level greater than 40%,
THEN do Step 23b.
- b. Verify charging pumps aligned to VCT '
LCV-112C -
OPEN o
LCV-112B -
CLOSED
- b. Manually align valves as necessary.
24 Check PRZR Level LESS THAN 874
[75% adverse CNMT]
Control charging and letdown as necessary to reduce PRZR level to less than 87%
[75% adverse CNMT].
If necessary establish excess letdown.
IF no letdown available AND CCW to RCPs established, THEN cycle charging pumps as necessary to control PRZR level.
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7 PAGE 20 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED NOTE:
For optimum long term.,pressure control, saturated conditions should be restored in the PRZR.
'5 Verify PRZR Liquid Temperature (TI-424) - AT SATURATION FOR DESIRED PRESSURE IF.PRZR liquid temperature
- low, THEN energize PRZR heaters as necessary to establish desired temperature.
26 Check RCS Subcooling Based On Core Exit T/Cs BETWEEN O' AND 10'F USING FIGURE MIN SUBCOOLING IF RCS pressure less than 160 psig
[200 psi'g adverse CNMT], THEN go to Step 27.
IF NOT, THEN depressurize using normal spray.
IF normal spray NOT available and letdown is in service, THEN use auxiliary spray for any further depressurization.
Return to Step 17b.
IF auxiliary spray NOT available, THEN return to Step 17a.
27 Check Cool Down Rate In RCS Cold Legs GREATER THAN 100'F IN ANY 60 MINUTES PERIOD Return to procedure and step in effect.
28 Maintain RCS Pressure And Temperature Stable For At Least 1 Hour
- a. Control steam dump and feed flow as necessary
- b. Perform actions of other procedures in effect which do not cool down the RCS or increase RCS pressure until the RCS temperature soak has been completed
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7 PAGE 21 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 29 WHEN 1 HOUR Soak Is Complete, THEN Continue RCS Cooldown And Depressurization.As Necessary
- a. Maintain RCS pressure and cold leg temperature within the limits of Figure SOAK LIMITS
- b. Establish and maintain cooldown rate in RCS cold legs
- LESS THAN; 50'F IN ANY 60 MINUTES PERIOD 30 Verify SI Flow Not Required:
o RCS subcooling based on core exit T/Cs
- GREATER THAN FIGURE MIN SUBCOOLING o
RVLIS indication:
o Level -
GREATER THAN 68%
[73%
adverse CNMT)
-OR-o Fluid fraction (any RCP running)
- GREATER THAN 80%
Manually operate SI pumps as necessary, IF RCS subcooling based on core exit T/Cs greater than Figure MIN SUBCOOLING and no RCP running, THEN perform the following:
- a. Establish conditions for starting an RCP:
o Bus llA or llB energized I
o Refer to Attachment RCP START
- b. IF conditions established, THEN start one RCP.
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7 PAGE 22 of 22 STEP ACTION/EXPECTED RESPONSE
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NOT OBTAINED 31 Return To Procedure And Step In Effect
-END-
Cl
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7 PAGE 1 of 1 FR-P.1 APPENDIX LIST TITLE 1)
FIGURE MIN SUBCOOLING 2)
FIGURE SOAK LIMITS 3)
ATTACHMENT RCP START 4)
ATTACHMENT SD-1 5)
ATTACHMENT CNMT RECIRC FANS 6)
ATTACHMENT N2 PORVS 7)
ATTACHMENT SI FLUSH PAGES
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FR-P.1 TITLE:
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TO IMMINENT PRESSURIZED THERMAL SHOCK CONDITION REV:
7 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
S PRESSURE (PSIG)
RCS PRESSURE INCREHENTS 20 PSIG SUBCOOLED REGION ADVERSE CNHT NORMAL CNHT INADEQUATE SUBCOOLING REGION TEHPERATURE INCREHENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEHPERATURE
(
F)
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TO IMMINENT PRESSURIZED THERMAL SHOCK CONDITION REV:
7 PAGE 1 of 1 FIGURE SOAK LIMITS PRESSURE (PSIG)
RCS 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 RCS PRESSURE INCREMENTS 20 PSIG REMAIN BELOW CURVE TEMPERATURE INCREMENTS 10' 0
250 300 350 400 450 500 550 600 650 700 RCS COLD LEG TEHPERATURE ('F)
I,