ML20040A278
| ML20040A278 | |
| Person / Time | |
|---|---|
| Issue date: | 12/21/1981 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20040A275 | List: |
| References | |
| REF-10CFR9.7 NUDOCS 8201200683 | |
| Download: ML20040A278 (5) | |
Text
F VI4AGWUS~0 fiRR BACKUP 1 OPEPATif6 PEACTOR EVEffTS TETIf6 fMY6,1981 0 BEAVER VALLEY UNIT 1,IhY 2, 1981 PLAfR IRIP - EMERGENCY PREPAREDNESS PLAT 1 IMPLETENTED - UNUSUAL EVEf1T Pt0-I-81-59
- WHILE AT 1007. POVER, C0tOUCTING STEAM GENERATOR MOISTURE CARRYOVER TEST ifJG. 1 CURIE OF [h-24 TRACER IN FEEDWATER.
"A" SG FEED 1ATER REGULATING VALVE FAILED OPEff, REACTOR TRIP Oti HIGH SG "A" LEVEL.
- f40RFAL TRIP RESPONSE, EXCEPT STEAM DLt'P TO CONDEf4SER SEEMED SLUGGISH.
- SUSPECTED MAIN STLAM CODE SAFETY VALVE OPEN!fE.
- LICEf4SEE DECLARED UNUSUAL EVENT, EKRGENCY PREPAREDtFSS PLAN PARTI ALLY IMPLEMENTED FOR ONSITE AfD OFFSITE RADIOLOGICAL MONITORINF. NONE DETECTED.
- If6PECT10N FOLLOVit6 TRANSIENT IDENTIFIED FEEDWATER VALVE N
ATO PIPING SUPPORT DAMAGE.
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.o M 0 FORT CALHOUN, APRIL 28,1981-PARTIAL LOSS OF D.C.
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- PARTIAL LOSS OF DC CAUSED LOSS OF LOAD TRIP, PARTIAL LOSS OF COPPONENT COOLING WATER AtO PARTIAL CONTAIN'ENT ISOLATION.
- LOSS OF DC CAUSED BY LOOSE WIRE IN FEEDER PANEL.
8201200683 811221 PDR 10CFR PT9.7 PDR
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2-OPERATOR SECURED RCP'S AFTER 4 MifUTES RUN T!K WITHOUT COMP 0fENT C00Lif1G WATER. PU4P VENDOR, BYR0f1 JACKSOff, REC 0ftENDS MAX.12 MifUTES AT 250 F.
- UNIT Of1 f4ATURAL CIRCULATION FOR 2 HOURS USING ATMOSPHERIC duffs.
ALL SYSTEMS APPEARED TO FlRJCTION NORf%LLY.
O MONTICELLO, APRIL 27,1981
- LOSS OF OFFSITE POWER, LOSS OF NORMAL DECAY HEAT REMOVAL DURING REFUELING OUTAGE.
THE '3" RHR LOOP OUT OF SERVICE FOR MAINTEfWJCE.
- IHE "A" RHR PLf4P BREAKER RACKED OUT VHl'_E ENERG1 ZED, CURRENT SURGE TRIPPED OTHER BREAKERS SUPPLIED BY SAME BUS AND THE OUTPLIT BREAKER FROM THE AUXILIARY TRANSFORE R.
A FIRE STARTED IN THE BREAKER CABINET.
0FFSITE PWER LOST FOR 10 MINUTES, HEAT UP OF REACTOR COOLANT 0.5 F PER HOUR.
FUEL POOL C00LIN3 SYSTEM WAS USED TO REFDVE DECAY HEAT FROM REACTOR CAVITY.
- 'lHE '3" RHR LOOP RETURNED TO SERVICE IN 8 HOURS.
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' O BRUNSWICK UNIT 1, APRIL 25,1981
- LOSS OF f0Rt%L DECAY HEAT REMOVAL, COLD SHUTDOWN FOR MAINTENN4E OUTAGE.
ONE RHR LOOP OUT OF SERVICE FOR f%!NTEN#JE.
THE BAFFLE IN THE OPERATING ElR HEAT EXOiANGER FAILED, ALLOWItG C00LIfG WATER TO BYPASS THE TUBE BUNDLE.
- BAFFLE FAILURE CAUSED BY HIGH AP 15 PSI ACROSS THE HEAT EXCHANGER NORMAL OPERATING LP 1 PSI. HIGH AP CAUSED BY CLNis IN THE HEAT EXCHANGER.
DECAY HEAT REMOVED BY SPENT FUEL POOL COOLING SYSTEM.
HEAT EXCHN4GER REPAIRED NO RETURNED TO SERVIE IN 16 HOURS.
O BURNSWICK UNIT 2, PAY 5, 1981
- AT MIDNIGHT SHUTTING DOWN, 2 INOPERABLE M HEAT EXCHANGERS, DISPLACED BAFFLE IN OtE OF TWO HEAT EXCHANGERS, OfE IN SERVIE OPERATING AT REDUCED AP ACROSS U-TUBES.
AT 7:30 AM GROUP l ISOLATION (REACT (li TRIP Ato PSIV CLOSURE, USINGRCICFORDECAYHEATREMOVAL).
3 PREVIOUS BAFFLE FAILURES.
- }E FOLLOW UP.
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0 3 If4ADVERTEf1T SAFETY IfAJECTIONS INITIALED 3Y SEC0f0ARY SIDE
- SALEM UNIT 2, SHUTDOWN AND COOLING DOWN, Duff VALVE SETPOINT DRIFT - STEAM LINE LP Sl.
- SEQUOYAH UNIT 3, SHUTDOWN TESTING PSIV'S HIGH STEAM FLOW AfD LOIAVESI.
- SEQUOYAH UNIT 1 1007. GEfERATOR TRIP TEST PROBLEf1 TRAf4SFERRifiG RCP'S - STENi LINE - AP Sl.
O COOPER, APRIL 28,1981
- FAILED TURBINE BLADES, VIERATIONS EXPERIENCED IN LOW PRESSURE TUR31f4E.
- 3 Bl.ADES M1SSIfJG, SHROUD MlSSING FROM A GROUD OF 6 BLADES, NIfE BLADES HAVE BROKEN ROOTS.
- SAME TURBINE ROTOR WHICH WAS GIVEN TEMPORARY FIX IN fAROi 0F 1980.
l C PAlfE YANKEE, PAY 2,1981
- REACTOR C00LAtiT PLfiP SEALS FAILED.
- FA! LURE OF #2 AfD #3 SEALS.
- OPERATION CONTINUING WITH 2 SEALS STILL FUNCTIONING UNTIL REFUELING, t
EfERGENCY TECH SPEC 5/5/81 TO ALLO 4 C1.0SURE OF LOOP ISOLATION VALVES TO CLOSE FROM C0ffTROL ROOM IF fECESSARY.
o itJLTIPE FAlllEE INF0Pl% TION ON TE 73 EVENTS DlSCUSSED AT OPGMTIf6 RFACTOR BRIEFItBS DEC 1980-f%Y 1981 r
If0EPEtEENT FAILURES
- FAILURES EALLt)RE RATE 2
5 IN 5 tons 3
1 in 5 tems 4
2 IN 5 tems 1
5 0 IN 5 rems CONSEQUENTIAL FAILURES
- CONSEQUEffTIAL FAILURES FAILURE RATE 1
3 in 5 te m s 2
1 IN 5 toss 3
0 in 5 tons 1
4 0 in 5 toss l
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