ML19275A219
| ML19275A219 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 09/20/1979 |
| From: | Johnson T, Link R CINCINNATI GAS & ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19275A218 | List: |
| References | |
| FOIA-80-587 NUDOCS 7910030337 | |
| Download: ML19275A219 (5) | |
Text
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THE CINCINNATI GAS & ELECTRIC COMPANY WM. H. ZIMMER NUCLEAR POWER STA[ ION UNIT 1 EMERGENCY OPERATING PROCEDURE ANTICIPATED TRANSIENT WITHOUT SCRAM (ATWS)
PROCEDURE NUPBER: CP.EOP.05 __
REVISION: 03 k iA PREPARED BY: , _ DATE: 7f REVIEWED BY: / _e o #n 3 ATE: f O/7f OPERATICNS SUPERVISOR: DATE: f M9[
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STATroN SuPeRINTeNoeNT:
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ANTICIPATED TR A NS I El.T WITHUUT SCRAMj AT.<S1 10 CONDITIONS l.1 ONE OF THE AUTO SCRAM PARAMETERS EXCEEDS ITS TRIP SETPOINT AND A RESULTANT SCRAM OCES NOT OCCUR.
1.2 "RX RECIRC PUMP 1A/19 TRIP ATWS INITIATED" ALARMS (AG10e/AF306).
2.0 AUTOMATIC ACTIONS NOTE AN AUTOMATIC SCRAM AND RELATED AUTOMATIC ACTIONS ARE ASSUME 0 NOT TO OCCUR.
21 RR PUMPS TRIP AND 00 NOT RESTART ON HIGH REACTOR PRESSURE (1120 PSIG) OR ON LOW-LOW REACTOR LEVEL (-38 INCHES).
22 SAFETY-RELIEF VALVES OPEN IF REACTOR PRESSURE EXCEEDS INDIVIOUAL VALVE SETPOINTS.
3.0 IMMEDIATE ACTIONS NOTE WHEN THE REACTOR SCRAM OCCURS, PROCEED WITH OP.EOP.01, REACTOR TRIP, IMMEDIATE AND SUPPLEMENTING ACTIONS.
NOTE STEPS 3.1 THROUGH 3.11 ARE TO BE DONE IN SUCCESSION UNTIL RODS ARE IN THE CORE.
31 ARM AND THEN DEPRESS THE 4 MANUAL SCRAM BUTTONS ON PANEL IH13-P603.
3.2 PLACE THE MODE SELECTOR SWITCH TO THE SHUT 00WN POSITION AT PANEL IH13-P603.
3.3 IF THE RR PUMPS REMAIN RUNNING, TRIP THEM BY PLACING THE PUMP CONTROL SWITCHES TO STOP AT PANEL IH13-P602.
IF THEY FAIL TO TRIP, LOCALLY TRIP 3REAKERS 10005 ANO 1E005 AT THE 10 ANC IE 6.9 KV.
34 ANNOUNCE ON THE PA "ATnS HAS OCCURREO, ATTEMPTING TO SCRAM THE REACTOR".
3.5 CE-ENERGIZE THE RPS TRIP SYSTEM A AND 3 BY OPENING BREAKERS LCBlA (RPS SUS A POWER) AND ICBlB (RPS BUS B POWEP) AT PANEL LH13-P609 AND 1H13-P611, RESPECTIVELY.
OP.EOP.05-2 } I' ' ) 2}I
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REV.03
w 3.6 OE-ENERGIZE THE 30wER TO THE PILOT SCRAM VALVES
+ _SOLENOIOS BY REMOVING THE FCLLOWING FUSES:
pp p FUSES PANEL P00Bl b ik) m F18A,E,C,G LH13-P609 F188,F,0,H lHl3-P$11 3.7 BLEED AIR FROM THE SCRAM VALVE ACTUATION LINES BY CLOSING THE IA SUPPLY VALVE TO THE HCU S R AM VALVES, ICll-5095, OPEN THE HIGH P0 INT VENT VALVE, LATER.)
3.d AT THE DIRECTION OF THE SHIFT SUPERVISOR, CE-ENERGIZE THE 137 INDIVIOUAL HCU SCRAM PILOT AIR VALVE SOLENOIOS BY PLACING THE A AND S ROO SCRAM TEST SWITCHES (2 FOR EACH HCU) IN THE " SRI" POSITION LOCALLY. AT EACH HCU (REACTOR BUILDING 546').
3.9 MANUALLY 3 RIVE CONTROL RODS INTO THE CORE IN ACCORDANCE WITH OP.NR.02.
3 10 INJECT SODIUM PENTABORATE INTO THE REACTOR BY INITIATING THE STANDBY LIOUID CONTROL SYSTEM IN ACCORDANCE WITH OP.EOP.27, EMERGENCY SHUTOOWN WITH THE SC SYSTEM.
3 11 INITIATE SUPPRESSION POOL COOLING MODE OF RHR IN ACCORDANCE WITH OP.RH.01.
4.0 SUPPLEMENTARY ACTIONS 41 MAINTAIN REACTOR WATER LEVEL AND PRESSURE WITH REACTOR FEEO PUMPS IF THE MSIVS ARE STILL OPEN OR WITH THE RI/HP SYSTEM (S) IF THE MSIVS ARE CLOSED.
4.2 MANUALLY OPERATE THE SAFETY RELIEF VALVES TO LIMIT REACTOR PRESSURE.
4.3 CONTINUOUSLY MONITOR REACTOR POWER ON THE APRMS AND IRMS, AND SRM'S AS APPROPRIATE.
44 SECURE SC INJECTION IF A SUFFICIENT NUMBER OF RODS HAVE BEEN INSERTED OR A SUFFICIENT AMOUNT OF BORON HAS SEEN INJECTED TO INSURE SUFFICIENT SHUTDOWN MARGIN.
4.5 PROCEEO WITH PLANT SHUTDOWN AND COOLDOWN IN ACCORDANCE WITH OP.IPOP.03, SHUTDOWN AS DIRECTED 3Y THE SHIFT SUPERVISOR.
4.6 INITIATE THE ACTIONS s'O REPAIR THE FAULTY RD AND/OR RP SYSTEMS.
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5.0 OlSfCUSSION AN ATWS EVENT IS A PLANT ANTICIPATEC NORMAL TR ANSIENT THAT SHOULO HAVE RESULTEC IN A REACTOR SCRAM (TRIP), BUT NO SCRAM OCCURS 00E TO A ?OSTULATEC FAILURE OF THE SCRAM CIRCUITRY OR CONTRCL ROD SYSTEM. THIS FAILURE IS HIGHLY UNLIKELY OUE TO THE .1EDUN D ANC Y IN TaE REACTOR PROTECTION SYSTEM; AND. THE SEPARATION AND INDEPENOENCE OF RCD SCR AM ACTUATOR AND ORIVE ECUIPMENT. THE PURPOSE OF THIS EOP IS TO PROVICE GUIDANCE OF
'dI TIGATING THE A TWS EVENT, SHOULO IT EVER OCCUR.
THE MOST SERIOUS ATWS EVENT IS A REACTOR COOLANT PRESSURE INCREASE FOLLOWING A LOAD REJECTION WITH BYPASS VALVE MALFUNCTION (OR CCMPLETE MSIV CLOSURE) AT HIGH POWER nITH A FAILURE TO SCRAM. THE BASIC INTENT OF THE ATWS MITIGATION PROCEDURES INCLUDES THE FOLLOWING:
RECOGNITION THAT AN ATWS EVENT HAS OCCURRED.
ATTEMPTING TO INSERT NEGATIVE REACTIVITY BY ANY METHOD (IE, MANUAL SCRAM, RR PUMP TRIP, ORIVING RODS, SC INJECTION).
REMOVING DECAY HEAT FROM THE REACTOR CORE.
IF 4 REACTOR SCRAM IS INITIATED, THE APPLICABLE STEPS OF OP.EOP.01, REACTOR TRIP SHALL BE FOLLOWED.
PLANT INDICATIONS THAT AN ATWS EVENT HAS OCCURRED MAY INCLUDE THE FOLLOWING:
AUTO SCRAM ANNUNCIATOR WINDOWS LIGHTED WITH ROD POSITION AND REACTOR POWER INDICATED THAT A SCRAM OID NOT OCCUR.
HEACTOR PRESSURE GREATER THAN THE AUTO SCRAM SETPOINT WITH NO SCRAM; HOWEVER, RESULTING IN SRV ACTUATION.
REACTOR POWER EXCEEDING L20% ON APRM BUT NO SCRAM OCCURS.
RECIRC PUMPS TRIP (100% SPEEO TO OFF) WITH ASSOCIATED ALARMS (OCCURS AT -38" OR 1120 PSIG).
SUPPRESSION POOL TEMPERATURE AND PRESSURE INCREASE DUE TO MULTIPLE SRV ACTUATIONS.
POSSIBLE CONTAINMENT RAOIATION LEVEL INCREASE QUE TO SRV ACTUATION.
MSIV FULL CLOSURE WITH NO AUTO SCRAM INDICATE 0.
TG TRIP WITH TURBINE BYPASS VALVE FAILURE (DOES NOT OPEN) AND NO RESULTANT AUTO SCRAM.
E,222%
O P . E O P . 0 5-
- REV.03
FAILURE TO ILLUMINATE THE INDIVICUAL ROC REC SCRAM LIGHTS ON THE ROD OISPLAY PAhEL WHEN AN AUTC SCRAM 1 9 SETPUINT HAS SEEN EXCEEDED.
- WHITE ROD SCRAM GRCUP SYSTE'4 LIGHTS (5) REMAIN ILLUMINATED ON Ah AUTO SCRAA CONDITION.
OP.EOP.05-5 REV.03