ML17263A262
| ML17263A262 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/21/1993 |
| From: | Marlow T ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17263A255 | List: |
| References | |
| AP-RCS.4, NUDOCS 9305140025 | |
| Download: ML17263A262 (66) | |
Text
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV 1
PAGE 1 of 30 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE PLANT SUPERINTENDENT EFFECTIVE DATE CATEGORY 1.0 REVIEWED BY:
9305140025 930505 PDR ADQCK 05000244 PDR
p4
AP-RCS.4 SHUTDOWN LOCA REV 1
PAGE 2 of 30 A.
PURPOSE This procedure provides actions for protecting the reactor core in the event of a loss of coolant accident (LOCA) that occurs during shutdown operations after the SI accumulators are isolated.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
SYMPTOMS The symptoms of shutdown loss of coolant accident are:
a.
Uncontrolled decrease in PRZR level, or b.
Uncontrolled decrease in RCS subcooling, or c.
Radiation alarms in CNMT, or d.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 3 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
o Conditions should be evaluated for site contingency reporting (Refer to EPIP-1.0, GINNA STATION EVENT EVALUATION AND CLASSIFICATION.
o Adverse CNMT conditions should be used whenever CNMT pressure is greater than 4 psig or CNMT radiation is greater than 10+
R/hr.
1 Monitor RCS Conditions:
o RCS subcooling based on core exit T/Cs GREATER THAN FIGURE MIN SUBCOOLING Stop RHR pumps and place in PULL STOP.
o PRZR level
- GREATER THAN 5%
[30% adverse CNMT) 2 Isolate RCS Letdown:
- a. Verify loop B cold leg to REGEN Hx, AOV-427 -
CLOSED a.
Place the following switches in CLOSE:
~ Letdown orifice valve (AOV-200A, AOV-200B, and AOV-202)
~ Loop B cold leg to REGEN Hx AOV-427
- b. Place letdown pressure controller, PCV-135, in MANUAL and close valve (demand at 100%)
c.
Excess letdown isolation valve, AOV-.310 -
CLOSED
- c. Manually close valve.
EOP:
AP-RCS.4 LITLE:
SHUTDOWN LOCA REV:
1 PAGE 4 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
IF the RCS is water solid, THEN charging should be controlled to maintain RCS pressure.
3 Establish Required RCS Injection Flow:
- a. Charging pumps
- ANY RUNNING a.
Perform the following:
- 1) IF CCW flow is lost to any RCP thermal barrier OR any Pl seal outlet temperature offscale high, THEN dispatch AO with RWST area key to lo'cally isolate seal in)ection 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.
- 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).
- c. Start charging pumps as necessary (75 kw) and establish 75 gpm total charging flow
~ Charging. line flow
~ Seal in)ection flow
EOP!
AP-RCS.4 TITLE!
SHUTDOWN LOCA REV 1
PAGE 5 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 4 Verify Charging Flow Adequate:
a.
Check the following:
o RCS subcooling based on core exit T/Cs GREATER THAN FIGURE MIN SUBCOOLING a.
Go to Step 5.
o PRZR level - GREATER THAN 5%
[30% adverse CNMT]
o PRZR level -
STABLE OR INCREASING
- b. Verify charging flow - LESS THAN 75 GPM b.
Go to Step 7.
c.
Go to AP-RCS.1, REACTOR COOLANT LEAK
S
EOP:
AP-RCS
~ 4 TITLE:
SHUTDOWN LOCA REV 1
PAGE 6 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION o
IF RWST LEVEL DECREASES TO LESS THAN 28%,
THEN THE SI SYSTEM SHOULD BE ALIGNED FOR SUMP RECIRCULATION USING ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, STEPS 1
THROUGH 13.
o HEALTH PHYSICS TECHNICIAN SHOULD BE CONSULTED PRIOR TO ENTERING A HIGH AIRBORNE AREA.
5 Verify SI Injection Capability:
a.
SI pump discharge valves to RCS cold legs OPEN
~ SI pump A, MOV-878B
~ SI pump B, MOV-878D
- a. Manually open AO to locally the following (locked valve valves.
Dispatch restore power to if necessary key required):
- b. SI pumps
- AT LEAST TWO PUMPS AVAILABLE
~ MOV-878B, MCC D position 8C
~ MOV-878D, MCC D position 8F
~ SI pump A, Bus 14 position 20A
~ SI pump B, Bus 16 position 12A
~ SI pump C, Bus 14 position 19A or Bus 16 position 13A
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 7 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6
Establish SI Flow:
- a. Verify the following valves OPEN
~ RWST outlet valves (MOV-896A and MOV-896B)
~ SI pump C suction valves (MOV-1815A and MOV-1815B) b.
Open SI pump suction valves from BASTs:
~ MOV-826A
~ MOV-826B
~ MOV-826C
~ MOV-826D
- a. Manually open valves as necessary.
- b. IF at least one flowpath from the BASTs NOT available, THEN open SI pump suction valves from RWST (MOV-825A and/or MOV-825B).
c.
Open SI pump discharge valves to RCS cold legs
~ MOV-878B
~ MOV-878D
- c. Ensure at least one valve open.
~ SI pump A, MOV-878B
~ SI pump B, MOV-878D
- d. Start ONE SI pump 7 Initiate Actions To Protect Personnel In CNMT:
a.
Evacuate personnel from CNMT
- b. Periodically monitor CNMT radiation
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV 1
PAGE 8 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 8 Establish Required CNMT Conditions:
a.
Depress MANUAL CNMT ISOLATION pushbutton
- b. Verify CI/CVI valves CLOSED
- c. Start all available CNMT RECIRC fans (240 kw each)
- d. Dispatch AO to locally fail open CNMT RECIRC fan cooler SW outlet valves (INT BLDG basement by MG sets)
~ FCV-4561
~ FCV-4562
- b. Manually close CI and CVI valves.
IF valves can NOT be
- closed, THEN dispatch AO to locally close valves (Refer to Attachment CI/CVI).
9 Check If RCPs Must Be Stopped:
a.
- ANY RUNNING b.
Check the following:
o RCP ¹1 seal D/P - LESS THAN 220 PSID a.
Go to Step 10.
- b. Ensure PRZR spray valve controllers demand at 0% and go to Step 10 '
-OR-o RCP ¹1 seal leakoff - LESS THAN 0.25 GPM
- c. Stop affected RCP(s)
EOP:
AP-RCS.4 SHUTDOWN LOCA REVI 1
PAGE 9 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 10 Check RHR Pump Status:
a.
RHR pumps aligned for injection mode:
a.
Go to Step 11.
- valve, MOV-856 -
OPEN o
RHR suction valves from loop A hot leg (MOV-700 and MOV-701)
CLOSED b.
Go to Step 12
EOP:
AP-RCS.4 TlTLE:
SHUTDOWN LOCA REV 1
PAGE 10 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Continue with Step 13 while aligning RHR for in)ection.
WHEN RHR
- aligned, THEN do Step 12.
11 Establish RHR Injection Alignment:
a.
Stop any running RHR pump
- b. Close RHR normal cooling valves:
o RHR suction valves from loop A hot leg (MOV-700 and MOV-701) -
CLOSED o
RHR discharge valves to loop B cold leg
$MOV-720 and MOV-721) -
CLOSED
o MOV-851A and MOV-851B (inside CNMT) -
OPEN o
MOV-850A and MOV-850B (outside CNMT) -
CLOSED
- d. Verify open RHR pump suction valves (MOV-704A and MOV-704B) e.
Open RWST to RHR pump suction valve, MOV-856,(energize DC control power key switch)
- f. Place RHR Hx bypass valve, HCV-626, to MANUAL and close valve g.
Check RHR pump suction temperature
- LESS THAN 260'F (PPCS-point T0684A or T0684B) h.
Open RHR Hx flow control valves
'(HCV-624 and HCV-625)
- i. Open RHR core deluge valves (MOV-852A and MOV-852B)
- b. Ensure at least one suction valve and one discharge valve closed.
- c. Manually align valves as necessary.
- d. Manually open valves.
- g. Perform the following:
2)
WHEN RHR pump suction temperature less than 260'F, THEN stop running RHR pump.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV 1
PAGE 11 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 12 Check If RHR Injection Flow Required:
a.
RCS subcooling based on core exit T/Cs
- LESS THAN FIGURE-MIN SUBCOOLING a.
Go to Step 13.
a.
Check RVLIS - AVAILABLE b.
Check RVLIS indication:
o Level (no RCPs)
GREATER THAN 68%
[73% adverse CNMTj
- a. IF PRZR level greater than 5%
[30% adverse CNMT] and stable or increasing, THEN go to Step 13c
~
IF NOT, THEN start SI pumps as necessary and go to Step 14.
- b. Start SI pumps as necessary and go to Step 14.
-OR-o Fluid fraction (any RCP running)
- GREATER THAN 80%
c.
Core exit T/Cs
- STABLE OR
, DECREASING
- c. Start SI pumps as necessary.
14 Check RCS Hot Leg Temperatures - STABLE O'I Control steaIn dump (or ARVs) and total feed flow as necessary to stabilize RCS temperature.
EOP:
AP-RCS.4 SHUTDOWN LOCA REV:
1 PAGE 12 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 15 Initiate Evaluation Of Plant Status:
- a. Attempt to identify and isolate RCS break
- b. Check AUX BLDG radiation NORMAL
~ Plant vent iodine (R-10B)
~ Plant vent particulate (R-13)
~ Plant vent gas (R-14)
~
CCW liquid monitor (R-17)
~
CHG pump room (R-4)
- c. Direct HP to obtain the following samples:
~ RCS activity
- d. Evaluate and operate equipment as necessary:
~
CCW pumps
~
SW pumps
~ Charging pumps
~ CNMT RECIRC fans
~ Steam dump/ARVs
- ~ VCT makeup system
- b. Attempt to identify and isolate leakage to AUX BLDG (Refer to AP-RCS.1, REACTOR COOLANT LEAK).
EOP:
AP-RCS.4 SHUTDOWN LOCA REV:
1 PAGE 13 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 16 Reset SI 17 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.
18 Verify Adequate Service Water Flow:
a.
Check at least two SW pumps RUNNING b.
- GREATER THAN 40 PSIG IN EACH LOOP
- a. Manually start pumps as power supply permits (258 kw each).
- b. Manually align valves as necessary.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 14 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 19 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 turbine building SW isolation valves 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
Piessure
- STABLE OR INCREASING e, Reset both trains of XY relays for IA to CNMT AOV-5392
OPEN a.
Perform the following:
- 1) Close non-safeguards bus tie breakers:
N
~ 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 20.
WHEN IA restored, THEN do Steps 19e and f.
0
EOP:
AP-RCS
~ 4 JITLE:
SHUTDOWN LOCA REV:
1 PAGE 15 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 20 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:
~ MOV-515, MCC C position 6C
~ MOV-516, MCC D position 6C
- b. Block valves
- AT LEAST ONE OPEN b.
Open one block valve unless it was closed to isolate an open PORV.
CAUTION IF ANY PRZR PORV OPENS BECAUSE OF HIGH PRESSURE, THEN STEP 21 SHOULD BE PERFORMED AFTER PRESSURE DECREASES TO LESS THAN THE APPLICABLE PORV SETPOINT.
21 Monitor PRZR PORV Status:
a.
Check Reactor Vessel
~
overpressure protection system-IN SERVICE a.
Go to Step 2ld.
b.
Check RCS pressure
- LESS THAN 410 PSIG c.
Go to-Step 21e d.
Check, PRZR pressure
- LESS THAN 2335 PSIG
- e. Verify PRZR PORVs CLOSED
- b. Verify at least one PRZR PORV open.
Continue with Step 22.
WHEN pressure less than
- setpoint, THEN do Step 21e.
- d. Verify at least one PRZR PORV open.
Continue with Step 22.
WHEN pressure less than
- setpoint, THEN do Step 21e.
- e. Manually close PORVs.
IF any
'PORV can NOT be closed, THEN manually close its block valve.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV 1
PAGE 16 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF CST LEVEL DECREASES TO LESS THAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR AFW PUMPS WILL BE NECESSARY (REFER TO ER-AFW.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).
NOTE:
TDAFW pump flow control valves fail open on loss of IA.
22 Monitor S/G Levels:
a.
Narrow range level GREATER THAN 5%
[25% adverse CNMT]
- b. Control feed flow to maintain narrow range level between 17%
[25$ adverse CNMT] and 39%
- a. Maintain total feed flow greater than 200 gpm until narrow range level greater than 17%
[25%
adverse CNMT] in at least one S/G.
- b. IF narrow range level in any S/G continues to increase, THEN stop feed to that S/G.
23 Check If RCS Overpressure Protection Should Be Placed In Service:
a.
Check the following:
o RCS cold leg temperature-LESS THAN 350'F a.
Go to S tep 24.
o RCS. pressure
- LESS THAN 400'sig
[300 psig adverse CNMT]
- b. Place RCS overpressure protection in service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)
AP-RCS.4 71TLE:
SHUTDOWN LOCA REV 1
PAGE 17 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 24 Check core exit T/Cs-GREATER THAN 200'F Go to Step 26.
NOTE:
Shutdown margin should be monitored during RCS cooldown (Refer to Figure SDM).
25 Initiate RCS Cooldown To Cold Shutdown:
- a. Maintain cooldown rate in RCS cold legs LESS THAN 100'F/HR
- b. Use RHR system if in service c.
Dump steam to condenser from S/Gs
- c. Manually or locally dump steam using S/G ARVs.
26 Check RCS Subcooling Based On Go to Step 41.
Core Exit T/Cs GREATER THAN FIGURE MIN SUBCOOLING 27 Check If SI In Service:
o SI pumps
- ANY RUNNING Go to Step 37.
-OR-o RHR pumps
'- ANY RUNNING IN INJECTION MODE
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 18 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 28 Place PRZR Heater Switches In The Following Positions:
o PRZR heater control group
- PULL STOP o
PRZR heater backup group
- OFF 29 Check PRZR level LESS THAN 134
[404 adverse CNMT]
Go to Step 31.
CAUTION RCS SUBCOOLING MAY BE LOST TEMPORARILY WHILE PERFORMING DEPRESSURIZATION TO RESTORE PRZR LEVEL.
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, THEN select one with an operable block valve.
30 Depressurize RCS To Refill PRZR
- 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.
b.
PRZR level - GREATER THAN 13%
[40% adverse CNMT]
- b. Continue with Step 31.
WHEN level greater than 13%
[40%
adverse CNMT], THEN do Step 30c.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 19 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF ADVERSE CNMT CONDITIONS EXIST OR IF PRZR LEVEL GREATER THAN 38% WITH NORMAL CNMT CONDITIONS)
THEN AN RCP SHOULD NOT BE STARTED'1 Check If An RCP Should Be Started:
- a. Both RCPs STOPPED
- a. Perform the following:
- 1) Stop all but one RCP.
- 2) Place spray valve controller for idle RCP in MANUAL at 0%
demand.
b.
RCS subcooling based on core exit T/Cs GREATER THAN FIGURE MIN SUBCOOLING 3)
Go to Step 32.
b.
Go to Step 41.
c.
PRZR level - GREATER THAN 13%
[40% adverse CNMT)
- c. Return to Step 29.
- d. Try to start an RCP
- 1) Establish conditions for starting an RCP a)
Bus llA or 11B energized b),.Refer to Attachment RCP START
- 2) Start one RCP
- d. IF an RCP can NOT be started, THEN perform the following:
IF NOT, THEN go to Step 32.
- 2) Ensure at least one control rod shroud fan running (45 kw).
- 3) Ensure one Rx compartment cooling fan running (23 kw).
0
EOP:
AP-RCS
~ 4 SHUTDOWN LOCA REV:
1 PAGE 20 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 32 Check RCS Cold Leg Temperature GREATER THAN 285'F Go to Step 36.
CAUTION IF RHR PUMP SUCTION TEMPERATURE IS GREATER THAN 260'F)
THEN CONSULT TSC BEFORE STARTING AN RHR PUMP.
33 Check SI Pump Status:
a.
Three SI pumps
- RUNNING b.
RCS subcooling Based on core exit T/Cs GREATER THAN 35'F
[90'F adverse CNMT)
- c. PRZR.level
- GREATER THAN 13$
[40% -adverse CNMT]
- d. Stop one SI pump a.
Go to Step 34.
- b. IF RCS hot leg tempeature greater than 320'F [310'F adverse CNMT] or IF RHR normal cooling in service, THEN go to Step 41.
IF RHR normal cooling NOT in service and RCS hot leg tempeature less than 320'F
[310'F adverse CNMT], THEN ensure at least one RHR pump running in injection mode and go to Step 33c.
IF no RHR pump can be operated in injection
- mode, THEN go to Step '41.
c.
DO NOT stop SI pump.
Return to Step 30.
EOP:
AP-RCS
~ 4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 21 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 34 Check If One Of Two SI Pumps Should Be Stopped:
a.
Two SI pumps
- RUNNING
- b. Determine required RCS subcooling from table Charging Pump Availability a.
Go to Step 35.
RCS Subcooling Criteria NONE ONE THREE 120'F [200'F adverse CNMT]
115'F
[190,'F adverse CNMT]
105'F [180'F adverse CNMT]
100'F [175'F adverse CNMT]
c.
RCS subcooling based on core exit T/Cs
- GREATER THAN VALUE FROM TABLE ABOVE USING FIGURE MIN SUBCOOLING d.
PRZR level -
GREATER THAN 13%
[40% adverse CNMT]
e.
Stop one SI pump
- c. IF RCS hot leg tempeature greater than 320'F [310'F adverse CNMT] or IF RHR normal cooling in service, THEN go to Step 41.
IF RHR normal cooling NOT in service and RCS hot leg tempeature less than 320'F
[310'F adverse CNMT], THEN ensure at least one RHR pump running in injection mode and go to Step 34d.
IF no RHR pump can be operated in injection
- mode, THEN go to Step 41.
d.
DO NOT stop SI pump.
Return to Step 30.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 22 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 35 Check If Last SI Pump Should Be Stopped:
a.
Any SI pump
- RUNNING
- b. Determine required RCS subcooling from table Charging Pump Availability a.
Go to Step 37.
RCS Subcooling Criteria NONE ONE TWO THREE c.
RCS subcooling based on core exit T/Cs GREATER THAN REQUIRED SUBCOOLING d.
PRZR level - GREATER THAN 13%
[40% adverse CNMT]
e.
Stop SI pump f.
Go to Step 37 Insufficient subcooling to stop SI pump.
255'F [295'F adverse CNMT]
235'F [285'F adverse CNMT]
210'F [270'F adverse CNMT) t
- c. IF RCS hot leg tempeature greater than 320'F [310'F adverse CNMT] or IF RHR normal cooling in service, THEN go to Step 41.
IF RHR normal cooling NOT in service and RCS hot leg tempeature less than 320'F
[310'F adverse CNMT], THEN ensure at least one RHR pump running in injection mode and go to Step 35d.
IF no RHR pump can be operated in injection
- mode, THEN go to Step 41.
d.
DO NOT stop SI pump.
Return to Step 30.
EOP:
AP-RCS. 4 T,l TLE:
SHUTDOWN LOCA REV 1
PAGE 23 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 36 Check If SI Pump Should Be Stopped:
a.
Any SI pump
- RUNNING b.
RCS pressure
- GREATER THAN 295 psig [510 psig adverse CNMT]
c.
PRZR level -
GREATER THAN 13%
[40% adverse CNMT]
- d. Stop one SI pump
- e. Return to Step 36a a.
Go to Step 37.
b.
Go to Step 41.
c.
Do NOT stop SI pump.
Return to Step 30.
37 Check If Charging Flov Should Be Controlled To Maintain PRZR Level:
a.
Check RHR pumps
- ANY RUNNING IN INJECTION MODE b.
Go to Step 41.
- a. Start charging pumps and control charging flow to maintain PRZR level and go to Step 38.
EOP:
AP-RCS.4 TITLE!
SHUTDOWN LOCA REV:
1 PAGE 24 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF ADVERSE CNMT CONDITIONS EXIST OR IF PRZR LEVEL GREATER THAN 38% WITH NORMAL CNMT CONDITIONS, THEN AN RCP SHOULD NOT BE STARTED.
38 Check RCP Status:
a.
- AT LEAST ONE RUNNING
- a. Try to start one RCP
- 1) Establish conditions for starting an RCP a)
Bus 11A or 11B energized b) Refer to Attachment RCP START
- b. Stop all but one RCP
- 2) Start one RCP.
IF an RCP can NOT be started, THEN verify natural circulation (Refer to Attachment NC).
IF natural circulation NOT verified, THEN increase dumping steam.
3)
Go to Step 39.
AP-RCS.4 SHUTDOWN LOCA REV:
1 PAGE 25 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION DEPRESSURIZING THE RCS MAY RESULT IN LOSING THE MINIMALRCP ¹1 SEAL OPERATING CONDITIONS.
THIS WILL REQUIRE THE RCPS TO BE TRIPPED.
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
39 Depressurize RCS To Minimize 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.
- b. Energize PRZR heaters as necessary
- c. Depressurize RCS until EITHER of the following conditions satisfied:
IF NO PORV available, THEN use auxiliary spray valve (AOV-296).
o PRZR level - GREATER THAN 75%
[65% adverse CNMT]
-OR-o RCS subcooling based on core exit T/Cs
- LESS THAN 10'F USING FIGURE MIN SUBCOOLING
- d. Stop RCS depressurization
EOP:
AP-RCS
~ 4 SHUTDOWN LOCA REVS 1
PAGE 26 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 40 Verify Adequate Shutdown Margin
- b. Borate as necessary.
41 Monitor RCS Inventory:
a.
Check the following:
o RCS subcooling based on core exit T/Cs
- GREATER THAN FIGURE MIN SUBCOOLING o
PRZR level -
GREATER THAN 5%
[30% adverse CNMT]
b.
Go to Step 43 a.
Perform the following:
- 1) Manually operate SI pumps to restore inventory and/or subcooling.
DO NOT operate more than two SI pumps.
2)
Go to Step 42.
42 Verify Adequate SI Flow:
a.
Check RVLIS - AVAILABLE
.b.
Check RVLIS indication:
o Level (no RCPs)
GREATER THAN 68%
[73% adverse CNMT]
-OR-
- a. IF PRZR level greater than 5%
[30% adverse CNMT] and stable or increasing, THEN go to Step 42c.
IF NOT, THEN start SI pumps as necessary and go to Step 43.
- b. Start SI pumps as necessary and go to Step 43.
o Fluid fraction (any RCP running)
- GREATER THAN 80%
- c. Core exit T/Cs - STABLE OR DECREASING
- c. Start SI pumps as necessary.
EOP:
AP-RCS.4 TlTLE SHUTDOWN LOCA REV:
1 PAGE 27 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 43 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.1, 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) 44 Check RCP Cooling:
a.
Check CCW to RCPs Establish normal cooling to RCPs (Refer to Attachment SEAL COOLING).
o Annunciator A-7, RCP A CCW RETURN HIGH TEMPERATURE OR LOW FLOW - EXTINGUISHED o
Annunciator A-15, RCP B
CCW RETURN HIGH TEMPERATURE OR LOW FLOW - EXTINGUISHED b.
Check RCP seal injection o
Labyrinth seal D/P -
GREATER THAN 15 INCHES o
RCP seal injection flow-GREATER THAN 6 GPM
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV' PAGE 28 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 45 Check If Seal Return Flow Should Be Established:
- a. Verify instrument bus D-ENERGIZED
- b. Verify RCP ¹1 seal outlet temperature
- LESS THAN 235'F
- c. Verify RCP SEAL DISCH VLVS -
OPEN
~ AOV-270A
~ AOV-270B
b.
Go to Step 46.
- d. Reset both trains of XY relays for RCP seal return isolation valve MOV-313 e.
Open RCP seal return isolation valve MOV-313
- f. Verify RCP ¹1 seal leakoff flow LESS THAN 5.5 GPM e.
Perform the following:
- 1) Place MOV-313 switch to open.
- f. IF any RCP seal leakoff flow greater than 5.5
- gpm, THEN perform the following:
o Close affected RCP SEAL DISCH VLV.
~ RCP A, AOV-270A
~ RCP A, AOV-270B
- g. Verify RCP ¹1 seal leakoff flow GREATER THAN 0.25 GPM o
Trip affected RCP.
IF both RCP SEAL DISCH VLVS
- shut, THEN go to Step 46
- g. Refer to AP-RCP.1, RCP SEAL MALFUNCTION.
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 29 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
This procedure should be continued while obtaining CNMT hydrogen sample in step 46.
46 Check CNMT Hydrogen Concentration:
- b. Hydrogen concentration
- LESS THAN 0.5%
47 Check If Normal RHR Cooling Can Be Established:
a.
Check the following:
o RCS cold leg temperature LESS THAN 350'F a.
Go to Step 48.
o RCS pressure
- LESS THAN 400 psig [300 psig adverse CNMT]
- b. Place RCS overpressure protection in service (Refer to 0-7, ALIGNMENT AND OPERATION OF THE REACTOR VESSEL OVERPRESSURE PROTECTION SYSTEM)
- c. Consult plant staff to determine if RHR normal cooling should be established using Attachment RHR COOL
EOP:
AP-RCS.4 SHUTDOWN LOCA REV 1
PAGE 30 of 30 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 48 Check core exit T/Cs LESS THAN 200'F Return to Step 21.
49 Evaluate Long Term Plant Status:
- a. Maintain cold shutdown conditions
- b. Consult plant staff NOTE:
Refer to 0-9.3, NRC IMMEDIATE NOTIFICATION, for reporting requirements.
50 Notify Higher Supervision
-END-
EOP:
AP-RCS.4 SHUTDOWN LOCA REV:
1 PAGE 1 of 1 AP-RCS.4 APPENDIX LIST TITLE PAGES 1)
FIGURE MIN SUBCOOLING 2)
FIGURE SDM 3)
ATTACHMENT RHR COOL 4)
ATTACHMENT RCP START 5)
ATTCAHMENT CNMT RECIRC FANS 6)
ATTACHMENT NC 7)
ATTACHMENT SEAL COOLING 8)
ATTACHMENT D/G STOP 9)
ATTACHMENT N2 PORVS
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 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 NORHAL CNHT INADEQUATE SUBCOOL ING REGION TEHPERATURE INCREHENTS 10'F 200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEHPERATURE ('F)
EOP:
AP-RCS.4 TITLE:
SHUTDOWN LOCA REV:
1 PAGE 1 of 1 FIGURE SDM NOTE:
o Curve includes allowance for one stuck rod.
Add 100 ppm for each additional stuck rod.
o To obtain core burnup, use PPCS turn on code BURNUP.
BORON CONCENTRATION (PPH) 1800 1600 BORON INCREMENTS 20 PPH 1400 1200 1000 ADEQUATE SDH 100 PPH CONSERVATISH INCLUDED 800 600 400 TE 200 BURNUP INCREMENTS 100 HWD/HTU 0
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 CYCLE 23 BURNUP (MWD/HTU)