ML20084J550

Ao:On 730522,during Leakage Testing for MSIV NSO4B,vol Between NOS3B & 4 Could Not Be Drained.Caused by Leak in NSO3B.Valve Stem Replaced

ML20084J550
Person / Time
Site:	Oyster Creek
Issue date:	06/05/1973
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8305180172
Download: ML20084J550 (1)

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M ADISoN AVENUE AT PUNCH DoWL Ro AD e MoRRisToWN, N.J. 07960 e 539 611 t June 5, 1973 Sh  ;

/4 c3 Mr. A. Giambusso Deputy Director for Reactor Projects 9-Directorate of Licensing 2 \Ngy, j Mg United States Atomic Energy Commission -

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Washington, D. C. 20545 o.s. l I

Dear Mr. Giambusso:

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Subject:

Oyster Creek Station Docket No. 50-219 Main Steam Isolation Valve The purpose of this letter is to report a failure of the main steam isolation valve NS03B to meet acceptable leakage as specified in Technical Specifications 4.5.F.1.D. This event is considered to be an abnormal occurrence as defined in the Technical Specifications, Paragraph 1.15.E. Notification of this event as required by the Tech-nical Specifications, Paragraph 6.6.B, was made to AEC Region I, Di cc-torate of Regulatory Operations, on Tuesday, May 22, 1973.

While attempting to test NS04B for Icakage as required by Technical Specification 4.5.E.4, the volume between NS03B and NSO4B could not be drained of water, indicating that NS03B was leaking. NS03B was tested for leakage and the Icakage was measured to be approximately 85 SCFil.

Cycling of the valve did not decrease the Icakage.

" Mechanical maintenance will disassemble NS03B, inspect the valve,

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replace the valve stem and perform any other required maintenance. Then the valve will be retested for leakage to assure that it meets the Y Technical Specification limit of 5% L 20. t

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J Additional information will be forwarded to your office when the f results of our inspection are available.

Ver{trulyyours, 8305180172 730605 d /

PDR ADOCK 05000219 S PDR M

' Mh Donald A. Ross Manager, Nucicar Generating Stations i DAR:cs i Enclosures (40) I

[Dgl}V cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region I ]

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