ML20086D627

Updated AO 73-32:on 731120,during Monthly HPCI Sys Pump Operability Surveillance Test,Both Gaskets on Gland Seal Exhaust Condenser Failed.Caused by Overpressurization of Condenser.Cooler Repaired & HPCI Verified Operable

ML20086D627
Person / Time
Site:	Vermont Yankee
Issue date:	11/28/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086D625	List: ML20086D623 ML20086D627
References
AO-73-32, VYV-3083, NUDOCS 8312020426
Download: ML20086D627 (2)

Text

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/ VERMONT YANKEE NUCLEAR POWER CORPORATION SCVENTY SEVEN OROVE STREET Run.Asa, VER>tOKr 05701 -

VYV-3083 P. O. BOX 157 VERNON. VERMONT 05354 November 28, 1973 Director Directorate of Licensing United States Atomic Energy Commission Washington, D.C. 20545 '

REFERENCE:

Operating License DPR-28 Docket No. 50-271 Abnormal Occurrence No. A0-73-32 Gentlemen:

As defined by Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7.d.1, we are reporting the following l Abnormal Occurrence as A0-73-32.

On November 20,1973, at 0620, during conduct of the monthly High Pressure Coolant Injection (HPCI) System pump operability surveillance test, both gaskets on the gland seal exhaust condenser failed. This cooler is required for proper operation of the HPCI system and its. loss precludes the HPCI operability required by Section 3.5.E.1.a of the Technical Specifications. The reactor was operating at approximately 62% power at the time of this incident.

Replacement of the failed gaskets was initiated immediately. I Concurrently, the operability verification required by Section 4.5.E.2 of Technical Specifications was begun. e The cooler was repaired and HPCI was tested and verified operable at 0945 on the date of the occurrence.

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8312020426 731120

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PDR ADOCK 05000271 ,

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9 VERMONT YANKEE NUCLEAR POWER CORPORATIOW Directorate of Licensing November 28, 1973 Page 2 1

i The Plant Operations Review Committee concluded that the

, causa of the blown gaskets was an overpressurization of the 4

condenser due to a possible improper setting of relief valve HPCI 23-66; however, as a result of the successful retest on November 20, 1973, it was agreed that the monthly pump operability test to be conducted in December,1973, would satisfactorily 1

demonstrate total system performance.

Very truly yours, VERMGNT YANKEE NUCLEAR POWER CORPORATION B. W. Riley i ,

Plant Superintendent WFC/kbd 4

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