ML20086E155
| ML20086E155 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 04/08/1975 |
| From: | Riley B VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086E153 | List: |
| References | |
| AO-75-08, AO-75-8, VYV-3821, NUDOCS 8312060099 | |
| Download: ML20086E155 (1) | |
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i VERMONT YANKEE NUCLEAR POWER CORPOR AT10N
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i sevcNTY ScVEN OROVE STREET RUTI,AND. VHMMONT 05708 VYV-3821 P. O. sox 157 4'
VERNON. VERMONT c5354 April 8, 1975 j
f United States Nuclear Regulatory Cemission
- Office of Inspection and Enforcement Region I l
631 Park Avenue j
King of Prussia. Pennsylvania 19406 ATTENTION:
James P. O'Reilly, Director
REFERENCE:
Operating 1.icenso DPR-28 i
Docket No. 50-271 Abnormal Occurrence No. A0-75-08 (24 Hour Report) j
Dear Sir:
i As defined by Technical Specifications for the Verrmat Yankee l
Nucicar Power Station. Section 6.7. we are reporting the folicniing Abnormal Occurrence as AO-75-08 and confirming.our telephone conversa-tion with your office.
i j
At approximately 0900 on April 8,1975, while performing a routine surveillance test, it was discovered that the Air Ejector Suction Valve I
Isolation tima delay timer 17-157A actuated at one (1) minute and six (6) seconds.
Table 3.2.4 of the Technical Specifications requires that the i
trip setting of this timer be set at less than or equal to one (1) minute.
i Failura of this timer to actuate within the specified tolerance resulted j
l in fewer operable instrument channels per trip system than that required j
hy Table 3.2.4 of the Technical Specifications.
j The timer was immediately reset to a trip setting of forty-seven (47) i seconds which precluded the necessity of performing the action specified in Notes 1 and 2 of Table 3.2.4 of the Technical Specifications.. The plant was operating at full power at the time of tha discovery of this occurrence.
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Very truly yours,
'B'radford W. Riley?
i HE/sjp Plant Superintendent
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8312060099 750418
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