ML20086E763

AO 74-02:on 740131,core Spray Sys Valve CS-11A Failed to Open When Control Switch Placed in Open Position.Cause Not Stated.Surveillance Testing Completed & Sys Aligned to Standby Mode

ML20086E763
Person / Time
Site:	Vermont Yankee
Issue date:	02/01/1974
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086E756	List: ML20086E754 ML20086E763
References
AO-74-02, AO-74-2, VYV-3154, NUDOCS 8312070513
Download: ML20086E763 (1)

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j -VER310NT YANKEM NUCLEAR Pow Mit ColtPORATION SCVCNTY GCVCN OFtOVC GTRCET

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February 1, 1974

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United States Atomic Energy Commission f ,% g Inrectorate of Regulatory operations, Pcgion I a ,,t (74.. Jj 631 Park Avenue / b,b y g)[bUi. L

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REFERENCE:

Operating License DPR-28 f' 11 M *'t M R- C.I Docket No. 50-271 L

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Abnormal Occurrence No. A0-74-02 -

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Centlemen:

As defined by Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7.B.1, we are reporting the following A*uuuutal Occurrence as A0-74-02 and confirming our telephone conversation with your office. ,

At approximately 2215 on January 31, 1974, while performing routine surveillance on the Core Spray System, valve CS-llA failed to open when the control switch was placed in the open position. ~

This constitutes a failure of a safety system component and is thereby an abnormal occurrence per Technical Specifications Section 1.0.A.4. The reactor was at approximately 97% power at the time of this incident.

Valve CS-llA was then manually opened to the full open position.

Since this valve will open in response to a Core Spray System initiation signal and is normally 1cft open, this Core Spray subsystem was then considered operable. The valve operability portion of the Core Spray curveillance testing was completed and the system was aligned to the standby mode.

.Very truly yours.

VERMONT YANREE NUCLEAR POWER CORPORATION' 8312070513 740207 PDR ADOCK 05000271 g S "

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H.W. Riley Plant Superintendent

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