ML20064F993

Deficiency Rept: Svc Water Sys Piping & Supports Potentially Deficient Seismically.Analysis of 674 Supports & of Piping Has Determined That All Pipe Supports Are Adequate for Svc Water Temp from 45F to 95F Degrees

ML20064F993
Person / Time
Site:	North Anna
Issue date:	11/22/1978
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064F998	List: ML20064F993 ML20064G001
References
REF-PT21-78-086-000 663, NUDOCS 7812060134
Download: ML20064F993 (2)

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VinorNIA ELECTHIC AND POWER COMI%NY H rc rrM on n,Vrlto rn z A c on 61 9

Novembcr'22, 1978 hO' C

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gCO Mr. James P. O'Reilly, Director Serial No. 663

)l G E-00 Office of Inspection and Enforcement P0/DLB:sej U. S. Nuclear Regulatory Commission Docket No. 50-338 Region II License No. N4 -

101 Marietta Str. set, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

f, Under the provisions of the operating license Technical Specifications, NRC Region II was notified on 11-17-78 that a potential significant deficiency existed at North Anna Power Station, Unit No. 1. NRC Region II was notified on 11-21-78 that this also constituted a substantial safety hazard as defined in 10CFR21.

In accordance with the reporting requirementa of the above regulations, the following information is submitted:

A. Name and address of reporting individual:

C. M. Stallings Virginia Electric & Power Company P. O. Box 26666 Richmond, Virginia 23261

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( B. Facility, activity, and/or component affected:

North Anna Power Station Service Water System - Piping and Pipe Supports C. Name of firm supplying the component, activity or service:

Stone & Webster Engineering Company P. O. Box 2325 Boston, Massachusetts 02107 D. Description of defect, deficiency, or failure to comply:

The Service Water Svstem nining and support requirements have been analyzed for thermal p "..aic produced stresses assuming a maximum Service Water tempm.e e of v5'F. The piping has been analyzed for a minimum Service Water temperature of 45*F. The pipe supports had been analyzed assuming a minimum temperature of 70*F. The Technical Specifica-tions limit the Service Water temperature to 95*F and preliminary analysin indicates that LOCA conditions may cause a greater than 95'F Service Water temperature. Analysis completed since the discovery of this problem has determined that all pipe supports are adequate for Service Water temperatures from 45*F to 95*F< p t7 812 (,6 013N ~

VstetxA Ex.acrcic Axo Powsa CoxPANY TO Mr. James P. O'R3 illy 2 E. Date of determination of reportability.

November 21, 1978 F. dimilar components, activities or Services:

Approximately 674 pipe supports and all Service Water piping is affected by this deviation. North Anna Unit No. 2 is also affected. ,

G. Corrective Action which has been, or. is being or will be taken, the individual responsible and the length of time to complete the action.

Investigation is continuing to determine required corrective action.

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H. Other information:

Any additional information regarding the above topics will be submitted in the Licensee Event Report.

Should you require futher information, please contact this office.

e u s, y

• C. 1 ta lings Vice Pr ident-Power Sup and P oduction Operatio

-- cc: Mr. John G. Davis, Acting Director Office of Inspection and Enforcement 9

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