ML20086E826
| ML20086E826 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/20/1973 |
| From: | Riley B VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086E820 | List: |
| References | |
| AO-73-35, VYV-3103, NUDOCS 8312070532 | |
| Download: ML20086E826 (2) | |
Text
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Directorate of Regulatory Operations, Region I MO k-631 Park Avenue Efs.@i,1 King of Prursia, Pennsylvania '9406
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?T ':C A 'M RPEERENCE: Operating License DPR-28 Docket No. 50-271 Enn e m ial Abnorral Occurrence No. A0-73-35
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gt As defined by Technical Specifications for the Veru>ont Yankee 3C Eclear Power Station, Section 6.7 B.1, we are reporting the following Abnortnal occurrence as A0-73-35 and confirtning our telephone conversation with your of fice,
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L On Decorber 19, 1973, at 1330, during conduct of the monthly sfp M in Steam Line Isolation Valve functional test. as referenced in
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. Technical Specifications, Table 4.1.1, valve V2-86C was exercised YNDM*,#
and cycled to the closed position.
This was verified when the valve " closed" limit switch caused Reactor Protection System relay
-5A-K3C to deenergize.
When the valve returned to the open position, it was noted that relay SA-K3C f ailed to energize as it should have with an open valve condition.
Operating peraonnel, attempting to det.cruine the cause, discovered the limit switch actuating arm to be in a position indicating valve cicsure. The actuating arn was tanually reset and the. nasociated relay was imediately energized.
This action
, restored the Reactor Protection Systets logic to its nort:.sl operating condition.
Valec V2-860 was cycled again and all valve littit switches were verified to be functioning properly. The reactor was opctating at gproxk.arely oCI power at the time of this incident, 83t2070532 731226 Very truly yours, PDR ADOCK 05000271 S
PDR VEMONT YANKEE UUCLEAR P0k'ER CORPORATION C,
D.W. Riley-Plant Superintendent
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e MEMO ROUTE SLIP 5" '"' a tou t 'a'*
For concurreac'-
For a:t'ca-fe>rm A f C ')4 ( Rev. Slav i 4. I')4 ') Alls 1 0240 Ne'esadreNta For t tr aN re.
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i TO (Name and unstJ
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R0 Chief, FSEEB VERMONT YANKEE RO:HQ (5)
DN 50-271 A0 73-35 R0 Files cATE Central Mail & Files Regulatory Standards (3)
TO (Name and unet) i%1TIAL5 REuAAKs Directorate of The above abnormal occurrence is forwarded Licensing (13) for infora ation.
Distribution will be made Regional Directors oATE (II, III, IV)
OCC by this office to the PDR, Local PDR, NSIC, TO -(Name and unst)
INTIALS REMARA$
DTIE, an'd State Representatives.
CATE FROM ame and un t)
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'E. J. Brunner Region 1 PHONE ps(1 CA3E1 /20/73 S-337-1246 LJSE OTHER SiOE FOR ADDITIONAL REMARK 5 CPO : 19710 - 441-4e 3
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