ML20086H181
| ML20086H181 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/21/1972 |
| From: | Rosalyn Jones VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086H184 | List: |
| References | |
| AO-50-271-72-15, VYV-2383, NUDOCS 8401160044 | |
| Download: ML20086H181 (1) | |
Text
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VERMONT YANKEIQ NUCLEAR POWER CORPORATION SEVENTY SEVEN OROVC STREET RuTLAxo, VF.l(MONT 037O1 VYV-2383
'e m P. O. DOX 157 VERNON. VERMONT c5354 December 21, 1972
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Director Directorate of Licensing j
U.S. Atomic Energy Commission ff i
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Washington, D.C.
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REFERENCE:
Operating License DPR-28 q
Docket No. 50-271
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Abnormal Occurrence No. A0-72-15 k
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Centlenen:
As defined by Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7.B.d, we are reporting the following Abnormal Occurrence as A0-72-15.
At approximately 1200 on December 19, 1972 while performing routine surveillance on the llPCI system, the IIPCI steamline high differential l pressure switch (DPIS 23-77) was found to be tripping at 200 inches of l
1 water.
This is above the value of 180 +5 inches of water specified bf f
Table 3.2.2.2 of Technical Specifications.
This sensor functions as an energized contact to auto close the IIPCI isolation valves on a steam line high differential (line break) pressure, The reactor was operating I
at approximately 55% at the time of this incident.
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The sensor was immediately reset, functionally tested, and verified I
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l to be operable within the tolerance specified. This remedial action was I
( > l4 completed in a time span which precluded the necessity of further action.
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The Plant Operations Review Committee concluded that although the pressure switch actuated above the specified pressure, the logic would
}f have actuated at the proper pressure because the companion switch (DPIS g
23-76) was set properly and each one provides isolation via a one-of-i s
\\' E I two-once logic.
Due to the relatively 'small discrepancy between the yi Q "as found" and the as specified setting, no additional surveillance beyond that regularly scheduled was deemed necessary for the subject switch.
1 Very truly yours,
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VERMONT YANKEE NUCLEAR POWER CORPORATION c-8401160044 721221 Robert F,t ones
{DRADOCK05000 Plant Superintendent y
1 7 01 OPY FFNT T?PCIONa/
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