ML20052F295
| ML20052F295 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Peach Bottom, Arkansas Nuclear, Crystal River, Ginna, 05000363, 05000000 |
| Issue date: | 04/22/1981 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML19219B002 | List: |
| References | |
| FOIA-81-417 NUDOCS 8205120323 | |
| Download: ML20052F295 (4) | |
Text
J OPEPATING REACTOR EVENTS WETING APRIL 22,1981 s
GItitlA, APRIL 14,1981 NilLE AT M POWER, OFFSITE POWER LOST DUE TO GROU 0 IN THE "B" PHASE CIRCUIT BREAKER ON T}iE LIf1E SIDE OF THE SPARE STATICt1 SERVICE TRN4SFORNR (13). THIS TRANSFORMER SER'ES AS BACKUP TO TdE STATICt1 SERVICE TRN4SFORMER (12A).
BOTH DIESEL GENERATORS STARTED #1D PICKED UP 480 v0LT LOADS.
PROMPT OPERATOR ACT10ft KEPT PLAlfr ON LINE AS SAFETY BUSES WERE PUT ON THE DIESEL GENERATORS NO NON-SAFETY BUSES REMAINED ON TdE MAIN GEt1ERATOR.
PLANT OPERATED FOR FIVE HOURS WITH DIESELS AT 25 AND 50% RATED LOAD BEFORE OFFSITE POVER RESTORED.
G PEAOi BOTTOM Uti!T 3, APRIL 14,1981
- FLOODtrG OF SECONDARY CONTAItfENT BUILDING DURING REFUELING OUTAGE (FUEL WAS REMOVED).
- HPCI PLF4P CASifJG HAD BEEN DISSAMBLED 1-2 WEEKS PRIOR TO EVEt1T ONE VALVEkPCI PlfiP DUE TO FIVE YEAR INSPECTION REQUIREMENT.
SUCTIOf}WAS PREVENTING CONDENSATE STORAGE TAtlK (CSI) WATER FRCt1 FLOODING.
LICENSEEHASNOTDETERMINEDEXACTCAUSEOFFLOODING-S[lLL ltNdSTIGATING. @CI SIGNAL WAS GEfiERATED ALTHOUGi PRELIMINARY l
REVIEW OF ADMlil!STRATION BLOCKIIG NO TAGGING DROCEDURES OF ECCS EcUletsNT HAS ROT REVEALED THE CAUSE.
- 153,000 GALLONS OF CST WATER FLOODED THE HPCI ROCri (9-10 FT) At0 SEC0i4DARY C0ffrAINMENT BUILDING BASEMENT (4 INCHES).
- FIRE ALARM ACTUATES CO SYSTEM ON HUCI ROOM.
LICEriSEE TO INSPECT 2
ALL iU/S AND ELECTRICAL MOTOR FOR DAMAGE IN HUCI Puff ROOM.
UNIT 2 UPMFFECTED.
8205120323 811103 PDR FOIA 0!CNAN81-417 PCR s
, 0 ARKNGAS UtilT 1, APRIL 8,1981
- WITH RPS CHAtNEL B Ill BYPASS, % CHANTEE C LOST DUE TO INVERTER TRNISIENT WHILE AT 3@5 PCWER.
INTEGRATED C0tiTROL SYSTEM (ICS) SEtEED 50' POWER NO Iti!TIATED FEEIMATER wpBACK.
3 REACTOR /IURBIf4ETRIPDUETOHIGiECSPRESSURE.
IMPROPERLY SET LIMIT SWITOi STOPPED B MAIN FEED BLOCK VALVE AT E
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CLOSURE. B STEN 4 GEtERATOR SUBSEQUENTLY OVERFED (t0T FLOODED) AS h.
PRESSURIZER LEVEL DROPS TO ZERO (TOT OFF SCALE).
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64ERGENCY STEN 4 DRIVEN Bl PUti' TRIPPED AFTER STARTIfE DUE TO EXCESSIVE VIBRATIOrl 0F TRIP MECHANISM.
CtE OF TWO REDUt041T EMERGEf4CY Pd BLOCK VALVES TO STENi GEtERATOR A FAIED TO OPEN.
PLAT 1THASRETURNEDTOPOWEROPERATION.
CRYSTALRIVERUNIT3,APRit11,12,198i.
6 0 ItNERTER TRIP DUE TO SHORTED DICCE CAUSES LOSS OF NON-NUCLEAR ItGTRUMENTATION (MD. SPURIOUS Ptl RUIEACK SIGNAL GENERATED. REACTOR TRIP Oil HIGH PRESSURE. SEC0f0ARYSYSTEMSAFETY VALVE OPENS Ato STICKS OPEN FOR SEVERAL MINLJTES RESULTIfG IN LOV
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.ww-LEVEL RELEASE.
ifdllE RETURNING TO POWER (3), PAINTENANCE BEING PERFORMED IN TURBITE THROTTLE VALVES ALLOWS ONE OR MORE VALVES TO OPEN BEFORE p
TURBIT 1E WAS ON LINE. l.0WSTEN4GENERATORLEVELACTUATESSTEN4 V
RUPTURE MATRIX NO TRIPS PLANT.
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) /'ff WHILE SUBCRITICAL Ato RCS TEMPERATURE BEING INCREASED BROUGH RCP y
Ag{y OPERATION, PRIMARY SYSTEM PRESSURE TRANSIENT EXPERIENCED DURIt',
SWITCHOVER FROM AUXILIARY TO MAIN FEEDWATER, PRESSURIZER SPRAY VALVE FAILS TO OPEN CAUSING REACTOR TRIP ON HIGH PRESSURE.
UNIT CURRENTLY SHUT DOVN TO REPAIR I61V ACTUATOR DAMAGED IN LAST TP.lP.
LICEfGEE HAS REQUESTED A TECH SPEC CiANGE TO ALLOV OPERATION WIW ONE MSIV ItCPERABLE.
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DURIt4G SURVEILLANCE TEST WIB A M W SCRAM, FULL SCRAM OCCURRED WHILE e
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,i PFiSSURIZlTG SCRAM /ALVE PILOT !R HEADER.
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- IbRt'R. AIR HEADER PRE:,SURE IS 70 PSI WIE TRIP SETPoltiT OF 50 PSI.
I' NEW PRESSURE SWIT m ES (AS A RESU_T OF IE BULLETIN 80-17) EVIDa m.Y J'
3 ENSED LOW AIR PRES 9URE WHIG TCMEfRARILY OCCURRED WHEN REPRESSURIZItG s
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~'THAT FART OF TriE HEADER THAT IS DEPRESSURIZED FOR THE 1/2 SCRAM TEST.
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.f WHILE COMitG BACK TO POWER OPER/ TION AFTER REFUELING OUTAGE, LICENSEE 4 1
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NSCOVERO TWO OUT OF FOUR DRYWELL PRESSURE SENSOR IllSTRtEEtiT LIFES (ROOT VALVES) WERE CLOSED. THESE StRSORS ARE TIED INTO ECCS AND CORE SPRAY IIRERLOCKS.
VALVES HAE BEEN CLOSED DUE TO CONTAINMENT INTEGRATED LEAK RATE TEST PER APPEt0lX J AfD WERE TOT OPETED.
fiPN!E CONSIDERitG GENERIC ACTION DUE TO RECENT OCCURRENCES AT OTHER FACIL'. TIES.
O Il!LLSTONEUNIT1,APRic21,1931 WHILE REWRN!f4G TO POER FOLLOW!?G A REFUELING OUTAGE, OPERATORS OBSERVED TURBINE EXCESSIVE VIBRATION ALARM C0!f4CIDEffT WIE HIGH cot 0VCTIVITV MEAEUREMEllTS (150 i+10 vs NOPFAL READIf4G OF <. 2.0)
IN THE t'AIN C0f0ENSER HOTWELL.
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- REACTOR /IURBINE MANUALLY TRIPPED.
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illTH BACKUP ISOLATION C0tOEtt3ER PREVIOUSLY DEClJED If0PERABLE, OPERATORS BLEED VIA SAFETY RELIEF VALVE ATO FEED VIA FEEDWATER PLW FRCti C0i4DEllSATE STORAGE TANK IN ORDER TO COOL DOWN PRIMARY C00LA U.
Tem SPEC C00LDWri RATE VIOLATED IN PROCESS.
- PLAtR CURREtRLY SHUTDOWN.
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