ML20086D743

AO 73-14:on 730530,fuse Which Supplies Ac to Main Steam Line Radiation Monitor Drawer 17-251D & High Voltage Power Supply 17-451B for Reactor Bldg Ventilation Area Radiation Monitors Blew.Blown Fuse Replaced & Isolation Cleared

ML20086D743
Person / Time
Site:	Vermont Yankee
Issue date:	05/30/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D737	List: ML20086D734 ML20086D743
References
AO-73-14, VYV-2688, NUDOCS 8312020483
Download: ML20086D743 (2)

Text

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' . ' O O ~M VERMONT YANKEE NUCLEAR POWER OCRPORATION ['

SEVENTY SeVEN OROVE STMECT RuTLAxo. VERMONT 05701 l VYY-2688 P. O. BOX 1s7 VERNON. VERMONT 053S4 May 30, 1973 l

United States Atomic Energy Coinnission Directorate of Regulatory Operations, Region I )

970 Broad Street Newark, New Jersey 07102 REFERE! ICE Operating Licenne DPR-28 .

l Docket No. 50-271 Abnormal Occurrence No. AO-73-14 Gentlemen:

Aa defined by Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7.A.c, we are reporting the following Abnormal Occurrence as A0-73-14 and confirming our telephone conversation i with your office.

At approximately 0900 on May 30, a fuse which supplies AC to 17-251D j main steam line radiation monitor drawer and 17-451B high voltage power supply for reactor building ventilation area radiation monitors, blev.

The blown fuse caused a group 111 isolation. Valves FSO-109-75A and 755 [i failed to close fully during the isolation. The inoperability of these valves exceeds the Limiting Condition for Operation as defined by Section 3.7.D.1 of Technical Specifications. The subject section requires that  ;

these valves be operable during power operation. 'Ite reactor was at 78% 3 power at the time of the incident. 4 The blown fuse was immediately replaced, the isolation cleared, and the subject valves were cycled successfully several times. The valves $

were declared operable by 0930 on May 30, 1971.

Very truly yours.

VERMONT YANKEE NUCLEAR POWER CORPORATION j B.W. Riley I Plant Superintendent ]

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i. 8312O20483 730606

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/1- Chief, FS&EB p Abnomal Occurrence: 73-14 (

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( , RO:HQ (5) 5-DR Central Files (1) cart The attached report from the subject licensee is Regulatory Standards :3)

Dir. of Licensing (13 i forwarded in accordance with RO Manual Chapter 1000.

T O (Name and watt) 1NsTLALS PEMAAK$

, The action taken by the licensee is considered ma appropriate. Followp will be performed during the next inspection a's appropriate. Confes of F HOM thame and unat) REMAAr$

the report have been forwarded to the PDR, Local 1/c[,y.3 A PDR, NSIC, DTIE and State representatives. The D. L. Caphton, RO:I licensee will submit a 10 day written report to __

PHONE na I DATE 5/31/73 Licensing.

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