ML20086H172

AO 50-271/72-17:on 721222,during Monthly HPCI Pump Surveillance Test,Gasket on Gland Seal Exhaust Condenser Failed.Caused by Overpressurization of Condenser Due to Improper Setting of HPCI PCV23-50.Valve Reset

ML20086H172
Person / Time
Site:	Vermont Yankee
Issue date:	12/28/1972
From:	Rosalyn Jones VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086H174	List: ML20086H172 ML20086H176
References
AO-50-271-72-17, VYV-2392, NUDOCS 8401160035
Download: ML20086H172 (1)

Text

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, VERMONT YANKEE NUCLEAR POWER CORPORATION l SEVENTY SEVEN OROvc STREET l l RUTLAND, WMIONT OG701 j ftEPLY TO:

,} VYV-2392 p. o. sox 157 l VERNON VEriMONT oS354 ember 28, 1972

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i' t- 10 Director f)

Directorate of Licensing [ },,

U.S. Atomic Energy Commission ((b

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REFERENCE:

Operating License DPR-28 US.g*jjj[

b al Occu e ce No. A0-72-17 g b U"

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Dear Sir:

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-l As defined by Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7.B.d, we are reporting the following Abnornal Occurrence as A0-72-17. ,

At 0445 on December 22, 1972, during conduct of the monthly HPCI pump operability surveillance test, the gasket on the gland seal exhaust condenser failed. 'This cooler is required for proper operation of the HP,CI and its loss temporarily precludes the HPCI operability required by

'Section 3.5.E.1,a of Technical Specifications. The reactor was operating at approximately 62% power at the time of this incident.

Replacement of the failed gasket was initiated immediately. Concurrently, the operability verification required by Section 4.5.E.2 of Technical Specifications was initiated. The cooler was repaired and HPCI was verified operable at 1125 on the date of the occurrence.

} / The Plant Operations Review Committee concluded that the cause of gJ jthe blown gasket was an overpressurization of the condenser due to an improper j i / setting of the HPCI PCV23-50. The pressure control valve was reset and locked j in a position to prevent valve opening at a pressure greater than 40 psi and k thereby prevent an overpressure condition in the condenser.

IIT jg Very truly yours,

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• VER40NT YANKEE NUCLEAR POWER CORPORATION 0401160035 721228 '~-

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PDR ADOCK 05000271

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R.F Jones Plant Superintendent f y MFL/rpb COPY SENT REGION ____-

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