ML20086D795
| ML20086D795 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 03/09/1973 |
| From: | Riley B VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086D797 | List: |
| References | |
| AO-73-07, AO-73-7, VYV-2504, NUDOCS 8312050123 | |
| Download: ML20086D795 (2) | |
Text
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n rOq (id'ld V ERMONT YANKMn NUcr#AR POWER CORPORATION L~VJ3 b
3EVcNTY GEVc4 OHOVc LTHCcT RUTI. AND, VI'.1&IO NT OG701 R I F* L Y T O:
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Director (o
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Directorate of Licensing LLJ L
U.S. Atomic i:ncrgy Conni: sion E
Uashington, D.C.
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Abnormal Occurience No. An-73-07
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Dear Sir:
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An defined by Technical Specifications for the Verrnont Yankee Nuclear
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Pou,r nrar tem prtinn f,. 7. n,1 un nrn vnnnreina enn (n11n..<no Aher,v.
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)I At approxinately 2300 on March 2, 1973 during conduct of an
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operability check of the High Pressure Coolant Injection (HPCI) Systen, a stean Icak was noted around the bonnet of the steam exhaust line j
check valve (llPCI-65). Although the HPCI systen was observed to be
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operable, repair of the check valve was elected as an innediate course of actlon.
Replacenent of the gasket precluded HPCI operability as
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required by Section 3.5.1:.1.a of Technical Specifications.
The react.or U
was operating at approxinately 60Z power at the time of this incident.
The :lPCI exhaust line stop check valve uns ganged shut and the check valve bonnet ganket pas replaced and the bonnet retightened.
Con c u r re n t. l y, the operability verification required by Section 4.5.E.2 l
of Technical Specifications was initiated.
At 0230 on March 3, 1973 the llPCI operability tnst van repeated satisfactorily, and no leakage was detected fron the bonnet of !!PCI-65.
The Plant Operations Review Committen concluded that although the valve bonnet leaked, the UFCI systen was still operable and would have perf orned i t:. designed function prior to gan);ing shut the exhaust line utop check valve.
Additionally, to determine whether or not this failure was a ttributable to conditiens during system operation, the valve bonnet 8312050123 730309 fd f
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l Directorate of I.icennini; l
!!:irch 9, 1973 Page 2 l
stu<l tightneun will be checked follouing each IIPCI Tamp operability tent f
during the next three months.
Very truly yours, i
l VI:1:MONT YANKEE NUCLEAR POWER CORPORATION f
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B.U. Riley 1
i Plant Superintendent l
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