ML13311A482
| ML13311A482 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/20/1982 |
| From: | Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13311A465 | List: |
| References | |
| SO1-1.2-1.12, NUDOCS 8205240462 | |
| Download: ML13311A482 (10) | |
Text
501-1.2-1.12 POST LOCA COOLDOWN AND REV 0 DEPRESS URI ZATI ON STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTANE EMERGENCY INSTRUCTION SO-1l.2-1.12 POST LOCA COOLDOWN AND DEPRESSURIZATION I.
PURPOSE:
The purpose of this instruction is to bring the reactor coolant system temperature and pressure to or below 350 OF and 400 psig and attempt to restore pressurizer level following a Loss Of Reactor Coolant.
8205240462 820520 PDR ADOCK 05000206 PDR I of 10
501-1.2-1.12 POST LOCA COLDOWN AND REV 0 DEPRESSURIZATION 0
TEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE:
Foldout page should be open.
CAUTION If core exit TCs exceed 1200 OF or RCS hot leg temperatures exceed 700 OF, then go to SOI-1.2-14, RESPONSE TO IMADEQUATE CORE COOL IG.
CAUTION If RWST level reaches 21% or containment level greater than MINUS 3 FT, align SI system for cold leg injection per S01-1.2-1.13, TRANSFER TO COLD LEG INJECTION AND RECIRCULATION.
Compare RCS And Steam Header Pressure:
- a. RCS pressure - GREATER
pressure, THEN go to SO1-1.2-1.TTOSS OF REACTOR COOLANT, step
- 11.
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DEPRESSURI ZATION
. SEACTION/EXPECTED RESPONSE ESPONSE NOT OBTAINE CAUTION If offsite powr is lost after SI is reset, manual SI initiation will be necessary to load safeguard equipment onto the diesel powered 4 KV busses.
2 Reset SI:
- a. Reset SI at SLSS Surveillance Panels.
- b. Verify lockout switches
- b. Reset lockout.
RESET.
switches.
3 Establish Maximum Charging:
- a. Reset non-running charging pump lockout.
- b. Start second charcing punp.
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501-1.2-1.12 POST LOCA COOLDOWN AND REV 0 DEPRESSURIZATION STEP ACTION/EXPECTED RESPONSE 1-RESPONSE NOT OBTAINED CAUTION Do not exceed total charging pump flow of 330 GPM to avoid potential damage to charging pumps.
4 Establish Charcing Flow Through SI Cod Leg Injecton Lines:
- a. Align cold leg injection flow path:
MOV 356 - OPEN.
MOV 357 -
OPEN; MOV 358 -
OPEN.
MOV 18 -
OPEN.
MOV l9 -
OPEN.
- b. Isolate normal charging f9ow path:
FCV 1112 -
CLOSED.
CV 304 -
CLOSED.
- c. Place seal supply flow controllers, FC 1115 A, B AND C, on MANUAL AND adjust controller to estlETish 200 gpm to each loop with two pumfps running.
5 Check If Feed Pumps Can be Stopped:
- a. RCS pressure -
INCREASES
WEt increase by 200 psi, THEN do not stop feed pumps.
- b. Stop feed pumps.
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S01-1.2-1.12 POST LOCA COOLDOWN AND REV 0 DEPRESSURIZATION STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 6
Initiate RCS Cooldown To 350 OF:
- a. Dump steam to condenser OR
- 1) Place steam dump controller PC 418 A on MANUAL CONTROL.
- 2) Place steam dump mode selector to - PRESSURE CONTROL ATMOS - CONDENSER.
- 3) Adjust drnping rate as necessary to maintain cooldown rate less than 50 OF/hr.
- b. Maintain SG narrow range levels at approximately 500 during cooldown.
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501-1.2-1.12 POST LOCA COOLDOWN AND REV 0 DEPRESSURIZATION ACTION/EXPECTED RESPONSE NOT OBTAINED 7
Check If Pressurizer Level can Be Re-established:
- a. RCS pressure - AT LEAST
300 psi greater than steam header pressure, THEN go to step 7b.
- b. Re-establish pressu'rizer level:
- 1) Open one PORV.
- 2) WHEN pressurizer level
- 2) IF PORV cannot be is greater than 50%,
THEN
- ETosed, THEN close close PORV.
its block valve.
- c. Energize pressurizer heaters as necessary to increase pressurizer temperature 50 OF above core exit TCs.
- 1) Maintain pressurizer temperature greater than 50 OF above core exit TCs.
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501-1.2-1.12 POST LOCA COOLDOWN AND REY 0 DEPRESSURIZATION
. STP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED 8
Check Containment Pressure:
- a. Containment pressure - LESS
- a. IF high, THEN depress THAN 1.4 PSIG.
override ulibuttons for valves needed open as containment systems are placed inservice.
Go to step 9.
- b. Depress Train A AND B containment isolation pushbutton.
9 Check RCP Cooling:
- a. Manually adjust CCW RESET.
flow.
- b. Verify RCP seal injection
- b. Establish seal water.
flow established -
RCP THERMAL Place flow controilers BARRIER DELTA PRESSURES in AUTO set to POSITIVE.
maintain a positive delta pressure.
- c. Open RCP seal return CV 527 AND CV 528.
- d. Verify seal leakoff is
- d. Place PCV 1115 A, B LESS THAN 4.5 GPM.
AND C in AUTO.
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DEPRESSURIZATION STEP ACTION/EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTI ON I RCPs must be tripped IF RCS pressure decreases to less than 300 psi above stiln header pressure.
10 Check If RCP Can Be Started:
- a. RCS pressure - AT LEAST
creater than stea header pressure.
- b. Pressurizer level - GREATER
- b. Go to step 11 until THAN 50.
pressurizer level greater than 50%.
11 Check RCS Temperature:
- a. RCS temperature
- a. IF RCS temperature is APPROXIMATELY 350 OF.
greater than 350 OF, THEN return to step E.
12 Check RCS Pressure:
- a. RCS pressure - GREATER
- a. IF pressure less than THAN 400 PSIG.
% PSIG, THEN go to step 15.
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501-1.2-1.12 POST LOCA COOLDOW-N AND REV 0 DEPRESSURIZATION STP RACTION/EXPECTED
RESPONSE
NOT OBTAINED 13 Verify Feed Pump Operation:
- a. Both feedwater pump breakers
- a. Stop feed pumps.
OPEN.
14 Depressurize RCS:
- a. Throttle FC 1115 A, B
- a. IF unable to AND C OR normal pressurizer oepressurize, THEN use spay T depressurize RCS one PORV.
to 400 psig.
- b. Attempt to maintain pressurizer level at approximately 501.
15 Evaluate Plant Status:
- a. Determine if RHR
- a. IF NOT, THEN return can be placed in So 01-1.2-1.0 service for cooldown LOSS OF REACTOR per 501-4-9, RESIDUAL COOLANT.
HEAT REMOVAL SYSTEM OPERATION.
-END H. E. MORGAN
- MANAGER, STATION OPERATIONS 9 of 10
S01-1.2-1.12 Rev 0 MDTQOFI DRIEN AFc' P'UM~PRE.ART C TER:.
- a.
IF a motor driver AFW pump trips on low discharoe pressure, THEN:
- 1)
Lower AFW'flow controllers.
- 2)
Reset AND restart pump.
SI TERMINATION CRITERIA FOLLOWING LOSS OF REACTOR COOLANT
- a.
Terminate SI when ALL parameters listed below are met:
- 1)
RCS Pressure
- GREATER THAN 1400 PSIG.
- 2)
RCS Subcooling
- 40 oF.
- 3) Pressurizer Level
- GREATER THAN 501.
- 4) Heat Sink:
(a) SG Level
- 10% N. R.
- 250 GPM.
SI REINITIATION CRITERIA FOLLOWING LOSS OF REACTOR COOLANT
- a.
Reinitiate SI if ANY ONE of the parameters listed below occurs:
- 1)
RCS Pressure LESS THAN 1400 PSIG.
- 3) Pressurizer Level LESS THAN 201.
COLD LEG RECIRCULATION SWITCHOVER CRITERIA
- a. IF RWST level less than 211, THEN align SI systemr for cold leg injection and recirculation per O-1.2-T.T3, TRANSFER TO COLD LEG IWJECTION AND RECIRCULATION.
SYMPTOMS FOR RESPONSE TO IADEQUATE CORE COOLING
- a.
Go to 501-1.2-14, RESPONSE TO INADEQUATE CORE COOLING, When ANY ONE of the following symptoms occur:
- 1)
Five or more core exit TCs -
GREATER THAN 1200 OF.
- 2)
RCS hot leg temperatures -
GREATER THAN 700 oF.
SYMPTOMS FOR RESPONSE TO LOSS OF SECONDARY HEAT SINK
- a.
Go to S01-1.2-15, RESPONSE TO LOSS OF SECONDARY HEAT SINK, IF AFW Flow is NOT AVAILABLE.
IF EVENTS REQUIRE IMPLEMENTATION OF THIS PROCEDURE
- a. Notify Watch Engineer.
- b. Notify Shift Technical Advisor.
- c. Notify Shift Communicator.
- d. Deterwine if event is classified as an energency and requires notification of offsite agencies and implementation of the Emergency Plan per 50123-VIII-11, RECOGNITION AND CLASSIFICATION OF EMERGENCIES.
- e.
IF event is NOT classified as an emergency in d above THEN determine if fZtification of the NRC is required within one hour per S01-14-13, NOTIFICATION TO NRC OF SIGNIFICANT EVENTS.
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