ML19275A868

Interim Deficiency Rept Re Performance of nonsafety-grade Equipment in Adverse Environ,Impacting Protective Functions Performed by safety-grade Equipment.Sys Under Review

ML19275A868
Person / Time
Site:	North Anna
Issue date:	09/28/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
REF-PT21-79-157-000 792, NUDOCS 7910190393
Download: ML19275A868 (2)

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~9 OCI I A 9 sept (mber as,1979 Mr. James P. O'Reilly, Director Serial No. 79' Office of Inspection & Enforcement PSE&C/JMD:adw:mc U.S. Nuclear Regul_atory Comission Region II Docket No. 339 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

On September 24, 1979, a report was made under the provisions of 10CFR50.55(e) concerning a potential unreviewed safety question based on Westinghouse information that the performance of non-safety grade equipment subjected to an adverse environment could impact the protect-tive functions perfomed by safety grade equipment.

In accordance with the reporting requirements of 10CFR21, the fol-lowing infomation is submitted:

A. Name and address of reporting individual:

Mr. E. A. Baum, Executive Manager Licensing and Quality Assurance Virginia Electric and Power Company P. O. Box 26666 Richmond, Virginia 23261 B. Facility, activity, and/or component affected:

North Anna Power Station, Unit 2 C. Name of firm constructing the facility or supplying the component, activity or service:

Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 D. Description of defect, deficiency, or failure to comply:

Westinghouse has informed Vepco that as part of a continuing review of the environmental qualifica-tions of Westinghouse supplied equipment, four (4) systems were identified which, if subjected to an adverse environment, could potentially lead to control system operation which may impact protec-tive functions. These systems are: $

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Mr. James P. O'Reilly 2

1) Steam generator power operated relief valve control system

2) Pressurizer power operated relief valve control system

3) Main feedwater control system .

4) Automatic rod control system ,

E. Date of determination of reportability:

September 24, 1979 ,

F. Similar components, activities, or services:

North Anna Unit 1 G. Corrective action which has been, is being or will be taken, the in-dividual responsible and the length of time to complete the action:

Westinghouse has provided Vepco the information on the basis for these concerns and we are now reviewing these systems for North Anna Unit 2 to detemine if any unreviewed safety questions or deficiences exist. The review will be complete and the results available in our 30-day report.

H. Other infomation:

None Any infomation not available at this time will be submitted in a follow-up letter as a 30-day report.

Should you require further infomation, please co act this of ce.

i uly d W n C. Brown, r.

ior Vice President-Po er Statio Engineering and onst uction cc: Director, Office of Inspection and Enforcement (3)

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