ML20086D722

AO 73-15:on 730612,first-stage Turbine Pressure Permissive Pressure Switch 5-14A Failed to Meet Proper Setpoint.Switch Reset & Returned to Svc

ML20086D722
Person / Time
Site:	Vermont Yankee
Issue date:	06/12/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D712	List: ML20086D708 ML20086D722
References
AO-73-15, VYV-2714, NUDOCS 8312020470
Download: ML20086D722 (2)

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. YANKIcic NUOLEAR POWER CORPORATION i

( f SEVt:NrY SEVEN OHOVE GTFTECT

- 1 RUTLAND, VtritMONT Or>701 Af f*LY T&r WV-2714' p. o. nox say VEttNON, VERMONY 05354 j Jime 12,1973;

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l United Statco Atomic Energy Cormticcion 6 Directorate of Regulatory Operations, Region 1:

! 970 Broad Street Newark, New Jersey 07302-d, REFERENCC: Operat.inD Licenan DPR-28 Docket No. 50-271 Abnormal Occurrance No. A0-73-15 l

1 Gentlement

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Au defined by Technical Specifications for the Vermont Yankee NucIcar Power Station, Section 6.7. A.c, we are reporting the following Abnormal Occurrence as A0-73-15 and confirming our telephone convernation with your office.

At approximately 1100 on June 12, 1973, while performing. a .testc in accordance with Tech. Spec. Table 4'.1.1, the First State Turbinu Prenoure Permionive Pressure Switch 5-14A, which deenergizes relay-SA-K9A above 220 paia, Iailed to.neet the proper outpoint. This Barksdale sonnor is . required by Tech. Spec. Section 4.1.A to. operate-with the Reactor mode switch .in the RUlr modo. .The reactor was operating at approximately 75% at the tice of this occurrence.

The switch was reset from 235 psia to operate at a conservative notpoint of 207' pain and: returnod.to acrvice at approximately 1120 June 12,1973.

Very truly yours, VERHONT YANKEE NUCLEAR /%'ER CORPORATION

. A B A Riley- M Plant: Superintendent:

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, i Licensce: Vermont Yankee Atomic Power Corporation ti q* li. . D. Thornbu rg, oart Docket No : .

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Abnormal Occurrence: 73-15

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.'l "0:HQ (5) i DR Central Files (1) ouc The attached report from the subject licensee is Regulatory Standards :3) _

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