ML20086H336

AO 50-271/72-04:on 720919,alarm Annunciated in Main Control Room Indicating Leak in Bellows of Main Steam Relief Valve. Failure Could Render One Relief Valve Incapable of Relieving Steam Pressure at Tech Spec Setpoint

ML20086H336
Person / Time
Site:	Vermont Yankee
Issue date:	09/27/1972
From:	Rosalyn Jones VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086H319	List: ML20086H317 ML20086H321 ML20086H324 ML20086H336 ML20086H343 ML20086H345 ML20086H355
References
AO-50-271-72-04, AO-50-271-72-4, VYV-2261, NUDOCS 8401160398
Download: ML20086H336 (1)

Text

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O O VERMONT YANKEE NUCLEAR POWER CORPORATION SEVENTY SEVEN OROVE STRCCT RuTLAxo, VERMONT 05701 REPt.Y TO:

VYV-2261 p. o. sox is7 VERNON. VERMONT 05354 September 27, 1972 e: .

Director  ?

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Directorate of Licensing Ei U.S. Atomic Energy Commission N R Washington, D.C. 20545 .

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REFERENCE:

Operating License DPR-28  % 'j ,

1 Docket No. 50-271 -! a Abnormal Occurrence No. A0-72-C!. E ,0  ;$

Dear Sir:

As defined by Technical Specifications for the Vernont Yankee Nuclear Power Station, Section 6.7.B.d. we are reporting the following Abnormal Occurrence as A0-72-04.

On September 19, 1972, an alarm annunciated in the main control room indicating a leak in the bellows of the main steam relief valve located on main steam line D. The failure of the bellows could render the one relief valve incapable of automatically relieving reactor steam pressure at its set point of 1075 psig (1080 psig +1%, Technical Specifications, Section 2.2.B).

The failed bellows in no way hinders the operation of the Automatic Depressurization System (ADS) or the reactor operators ability to manually operate the relief valve. Although the ADS is not considered inoperable, the High Pressure Coolant Injection System was tested and demonstrated to be operable immediately after the discovery of the failed bellows.

l Very truly yours, VE ONT YANKEE NUCLEAR POWER CORPORATION 8401160398 721101 e.

DRADOCK05000g i Robert F; ones Plant Superintendent p dp ,

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WM/rpb 1

5585

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