ML20086E411

AO 74-14:on 741015,primary Containment Leak Discovered. Caused by Missing 1/2-inch Test Connection Plug on Drywell Penetration X-16A.Plug Installed

ML20086E411
Person / Time
Site:	Vermont Yankee
Issue date:	10/16/1974
From:	George Thomas VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-74-14, VYV-3416, NUDOCS 8312070104
Download: ML20086E411 (1)

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4 VERMONT YANKEE NUCLEAR POWER CORPOR ATION SEVENTY SEVEN OROVC STREEr RUTLAND, VeaMosT osvoi P DOX 157 VERNON, VERFtONr 05354 i

j October 16, 1974  :

I Director Directorate of Regulatory Operations, Region I United States Atomic Energy Cocmission 631 Park Avenue King of Prussia, Pennsylvania 19406

REFERENCE:

Operating License DPR-28 Docket No. 50-271 Abnornal Occurrence No. A0-74-14 (24 !!our Report)

Dear Sir:

As defined by Technical Specifications for the Vermont Yankee Nuclear Power Station, Section 6.7, we are reporting the following Abnormal Occurrence as A0-74-14 and confirning our telephone conversation with your office.

At approxinately 1115 on October 15, 1974, while pressurizing the primary centainment in preparation for the Class A leak rate test, a leak in the primary contM=nt was evident. The leak was identified as a missing 1/2 inch test connection plug on_drywell penetration X-16A, which is the Core Spray System 'A' containnent penetration. The missing plus resulted in an abnormai degradation of one of the several boundaries designed to contain radioactive materials.

A pipe plug was immediately obtained and. installed in the test connection and pressurization of the primary containment was continued.

Very truly yours, h2 DO O 00 VERHONT YANKEE Nt! CLEAR POWER CORPORATION

. TM G.S. Thonas ,~

Assistant Plant Superintendent p ; < .( J