ML20086B890
| ML20086B890 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee  |
| Issue date: | 06/29/1976 |
| From: | VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | |
| References | |
| NUDOCS 8311220036 | |
| Download: ML20086B890 (5) | |
Text
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50-271 ,
D ckst Number cMents or Occunences VERMONT YANKEE , _
Picat Name io. t Date Description R0 EVENT DURING SURVEILLANCE TESTING OF THE HIGH SUPPRESSION CHAMBER WATER LEVEL SWITCH 76-14 DATE IT WAS FOUND THAT LEVEL SWITCH 23-91A WOULD NOT ACTUATE AT ITS TECH SPEC.
5/19/76 RO EVENT WHILE PERFORMING WEEKLY SURVEILLANCE ON THE STACK CHARCOAL CARTRIDGE AND THE 76-15 DATE STAC PARTICULATE FILTER, A CHEMISTRY AND HEALTH PHYSICS TECHNICIAN INADVERTENTLY 5/25/76 SECURED BOTH PLANT STACK MONITORING SYSTEMS CONCURRENTLY. -
PN EVENT BOMB THREAT.
22 DATE .' .'
6/4/76 7 &
s PN EVENT ORGANIZED DEMONSTRATION AT VERMONT YANKEF.
23 DATE ' -
6/4/76 RO EVENT DURING SURVEILLANCE TESTING OF THE HIGH SUPPRESSION CHAMBER WATER LEVEL SWITQH 76-10 DATE IT WAS FOUND THAT LEVEL SWITH 23-91A WOULD NOT ACTUATE AT ITS TECH. SPEC. TRIP 6/14/76 LEVEL SETTING OF 6 A INCHES.
lRO EVENT WHILE OPERATING AT A STEADY STATE POWER LEVEL OF 887., A STATION OPERATOR INAD-l 7 6-l'/ DATE VERTENLY DRAINED THE REFERENCE LEG OF A LEVEL INSTRUMENT WHICH IS PART OF THE 6/16/76 REACTOR VESSEL WATER LEVEL OCNIROL SYSTEM.
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l RO EVENT WHILE PERFORMING SRM RESPONSE CHECKS IN ACCORDANCE WITH TECH. SPEC. 4.'12.B, THE 76-1F DATE CONTROL ROD BLOCK ASSOCIATED WITH THE "0NE CONTROL ROD WITHDRAWAL PERMIT CIRCUIT" 6/29/76 WAS FOUND TO BE INOPERABLE ~.
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VERMONT YANKEE Incidents or Occurrences i P1:nt Name No. '
Date Description RO EVENT CONTROL ROOM OPERATOR OBSERVED A FLOW FAULT ALARMS FULL CLOSED INDICATION ON 76-7 DATE VALVE V-75-C1, AND LOSS OF POWER INDICATION ON THE CONTAINMENT AIR SAMPLING 3/2/76 (CAS) SYSTEM.
1 RO EVENT THE "A" :PCI SUBSYSTEM WAS DECLARED INOPERABLE AND THE ALTERNATE TESTING DEFINED l 76-8 DATE BY TECH. SPEC.
4/15/76 -
O RO EVENT LEVEL SWITCH LS23-74 ASSOCIATED WITH THE LOW CST /HPCI SUCTION VALVE SWITCH CIR-76-9 DATE CUIT FAILED TO ACTUATE AT ITS REQUIRED SETPOINT. ' ' ~
4/21/76 f &
Rd EVENT
, PRIOR TO AN IMPEDNDING ELECTRICAL STORM, REACTOR OPERATORS ATTEMPTED TO START, 76-10 DATE "B" DIESEL GENERATOR FROM THE CONTROL ROOM. WITHIN ONE MINUTE, THE UNIT TRIPPED 5/6/76 ON HIH CRANKCASE PRESSURE.
O RO EVENT THE RHR 27A & B VALVES WOULD NOT COMPLETELY OBTAIN THEIR' REQUIRED OPEN POSITION 76-11 DATE FROM THEIR NORMALLY CLOSED POSITION. -
5/10/76 -
RO EVENT WHILE PERFORMING .THE MONTHLY HPCI SYSTEM PUMP OPERABILITY SURVEILLANCE TEST, 76-12 DATE THE HEAD GASKET ON THE GLAND SEAL CPONDENSER FAILED.
5/12/76 RO EVENT DURING THE PERFORMANCE OF 0.P. 4363, HPCI/ CONDENSATE STORAGE TANK LEVEL SWITCH 76-13 DATE FUNCTIONAL SURVEILLANCE TEST, IT WAS DETERMINED THAT LS 23-74 WOULD NOT ACTUATE 5/19/76 AT ITS REQUIRED SETPOINT OF 14 3/8 INCHES ABOVE TANK BOTTOM.
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50-271 Drcket Number Incidents or Occurrences VERMONT YANKEE , ~.
Plant Name Ns. Date Description A0 EVENT WHILE PERFORMING MONTHLY LPCI PUMP AND MOTOR OPERATED VALVE OPERABILITY SUR-75-24 DATE VEILLANCE TESTING, LPCI INJECTION VALVE V-10-25A FAILED TO RESPOND TO AN OPEN 12/12/75 SIGNAL GENERATED FROM IT REMOTE CONTROL SWITCH.
I R0 EVENT DURING PLANT STARTUP, BOTH CHANNELS OF THE AEOG RADIATION MGNITORS WERE DISCOV-76-1 DATE ERED TO BE READIN6 ABNORMALLY LOW DUE TO A PURGE VALVE BEING STUCK IN THE OPEN 1/18/76 POSITION. .
RO EVENT A PLANT SHUTDOWN WAS INITIATED VOLUNTARILY AS A SAFETY PRECAUTION BEGINNING AT 76-2 DATE 2019 ON 1/26/76, WITH THE REACTOR BEING ON SHUTDOWN COOLING-AT 0336 ON 1/27/73.
1/26/76 , ,
R0 EVENT AT APPROXIMATAELY 0420 on 2/14/76, CONTROL ROOM PERSONNEL OBSERVED A FLOW FAULT 76-4 DATE ALARM AND LOSS OF POWER INDICATION ON THE SAMPLE PUMP ASSOCIATED WITH THE CON-2/14/76 TAINMENT AIK SAMPLING SYSTEM.
R0 EVENT SUBSEQUENT TO A REACTOR STARTUP, IT WAS DISCOVERED THAT A PORTION OE A PROCEDUR[a 76-5' DATE ASSOCIATED WITH SECURING FROM THE SHUTDOWN COOLING MODE OF OPERATION WAS NOT 2/17/76 PERFORMED.
R0 EVENT 10F THE 4 LOW-LOW WATER LEVEL SWITCHES ASSOCIATED WITH THE DIFFERENTIAL PRESi-76-6 DATE SURE INDICATING SENSOR 2-3-72A ACTUATED AT A VALUE LESS'iTHAN MINUS 50" 0F WATERc 2/25/76
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50-271 ,
D:cket Number VERMONT YANKEE Incidents or Occurrences Plent Name l
Eo. Date Description PN-52 EVENT DURING A DRYWELL INSPECTUIB THE THE REACTOR AT OPERATING TEMPERATURE AND PRESSUR$
DATE LEAKAGE WAS NOTED FROM A RECIRC LOOP RISER 1-INCH INSTRUMENT LINE. )
8/27/75 l A0 EVENT DRUING ROUTINE SURVEILLANCE ON Tile RCIC SYSTEM, STEAM SUPPLY ISOLATION VALVE-75-18 DATE 13-15 WOULD NOT FULLY CLOSE.
9/1/75 .
9-A0 EVENT WHILE PERFORMING A ROUTINE SURVEILLANCE TEST, IT WAS DISCOVERED THAT THREE 75-19 DATE OF THE FOUR FIRST! STAGE TURBINE SCRAM BYPASS SWITCilES (5-14A, B AND C) ACTUA,TED 9/11/75 AT SET POINTS OF 231.'7, 229.7 AND 224.7 PSIA SESPECTIVELY. ,
A0 EVENT DURING SURVEILLANCE TEST, RPS RELAY 5A-K3A FAILED TO DEENERGIZE UPON PARTIAL 75-20 DATE CLOSURE OF MSIV 2-86A.
9/27/75 A0 EVENT DURING A REVIEW OF SURVEILLANCE RECORDS BY A CHEM & HP SUPERCISOR, UT BECAME, 75-21 DATE APPARENT TilAT A TECH. PEC. SURVEILLANCE (4.6.B.1.b) REQUIRING A ISOTOPIC 10/7/75 ANALYSIS OF A REACTOR COOLANT SAMPLE HAD BEEN INADVERTENTLY SIGNED OFF FOR THE MONTil 0F AUGUST.
A0 EVENT DURING Tile PERFORMANCE OF THE STARTUP TRANSFORMER LOADING TEST, TP75-04, WITH 75-22 DATE Ti!E PLANT IN A COLD SHUTDOWN CONDITION RHR VALVE 10-25B OPEN IN RESPONE TO THE 11/9/75 TEST INITIATED AUTO-OPEN SIGNAL.
l A0 EVENT AT APPROXIMATELY 08300 ON 12/4/75, CONTROL ROOM PERSONNEL OBSERVED A FLOW 75-23 DATE FAULT ALARM LOSS OF POWER INDICATION ON THE SAMPLE PUMP ASSOCIATED WITil THE 12/4/75 CONTAINMENT AIR SAMPLING SYSTEM.
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50-271 .
D;cket Number ~
77 Incidents or Occurrences l Picnt Name i
- p. Date Description PN-33 EVENT SPILL OF SODIUM HYPOCHLORITE INTO CONNECTICUT RIVER AND FISH KILL.
DATE 7/2/75 A0 EVENT WHILE PERFORMING ROUTINE SURVEILLANCE TESTING ON THE CORE SPRAY SYSTEM, INJECTION '
76-13 DATE VALVE CS-11B FAILED 10 OPEN WHEN THE CONTROL SWITCH WAS PLACED IN THE OPEN 7/7/75 POSITION. . .
A0 EVENT WHILE PERFORMING THE MONTHLY HPCI SYSTEM PUMP OPERABILITY SURVEILLANCE TEST, THE 75-14 DATE HEAD GASKET ON THE CLAND SEAL EXHAUST CONDENSER' FAILED.
, 1 7/25/75 f 8
. . 1 A0 EVENT DURING NORMAL OPERATION-AND. PLANT INSPECTION TOUR, VAPQR WAS OBSERVED LEAKING 75-15 DATE FROM A0G DRAIN TANK PIT HATCH COVER. . .
7/3/75.' -
A0 EVENT DURING A ROUTINE NRC INSPECTION, THE INSPECTOR DISCOVERED THA THE ECCS LOW-LOW 75-16 DATE RX WATER LEVEL. INSTRUMENT 2-3-72C SETPOINI WAS .i8 INCHES BELOW THE TECH. SPEC.:
7/24/75 1
~ l PN-4L EVENT ANTI-NUCLEAR DEMONSTRATION.
DATE 8/6/75 A0 EVENT WHILE PERFORMING AN INSPECTION ONITHE DRYWELL, A SMALL STEAM LEAK WAS OBSERVED 75-1; DATE ON A ONE INCH INSTRUMENT LINE THAT IS CONNECTED TO THE EXTERNAL PORTION OF ONE 8/27/75 JET PUMP INLET RISER.
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