ML19289D957

Confirms 790313 Telcon Re Potential Pipe Stress Problems at Facility.Engineering Review of Stress Calculations Began 790310.Plant Placed in Hot Shutdown on 790309 & in Cold Shutdown on 790313.Ref LER 78-053/01T-0

ML19289D957
Person / Time
Site:	Beaver Valley
Issue date:	03/13/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7903210089
Download: ML19289D957 (2)

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DUQUESNE LIGilT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 March 13, 1979 BVPS: JAW:b46 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Updated LER 78-53/01T-0 Mr. B.11. Grier, Director of Regulation United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

This is to confirm telephone discussions with R. Keimig and D. Beckman of your office by the undersigned at about 10:30 a.m. on March 13, 1979 regarding potential pipe stress problems at Beaver Valley Power Station.

As a result of the continuing review by the Duquesne Light Company Engineering Department of the architect-engineer pipe stress design calculations discussed in LER 78-53, a meeting was held by the NRC with representatives of Duquesne Lif;ht Company and the architect-engineer. At this meeting, a concern developed that there was a possible misapplication of seismic stress terms to various safety system piping during plant design stages. On March 9, their concern was presented to Corporate management and the plant Superintendent. A decision was made to assemble a review task force of Duquesne Light Company and consultant engineers and send them to the home offices of the architect-engineer. This task force arrived at the architect-engineer's offices on March 10 and immediately began review of the plant engineering pipe stress calculations.

I cf 7903210039

Mr. B. H. Grier Maren 13, 1979 BVPS: JAW:646 Page 2 In an effort to conserve fuel and because the Duquesne Light Company system load was not critical, the plant was shut down to the hot shutdown mode the af ternoon of Fbrch 9. It remained in this mode until the morning of March 13, at which time the Superintendent was notified that the review task force had identified piping with potential stress problems. The Superintendent called an Onsite Safety Committee meeting and notified the Committee of these potential problems. The Committee recommended cold shutdown of the plant until the potential problems were identified and resolved or exonerated. At 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br />, the Superintendent implemented the recommendation and ordered operations to cool down the plant to the cold shutdown mode.

The Offsite Review Committee was immediately advised. The committee met and concurred in the Superintendent's action. The plant shall remain in the cold shutdown mode until the results of the task force review are presented to both safety committees and further recommendations made.

This letter serves to place in writing notification to the Region 1 Director of the foregoing events. If any further information is required, please contact the undersigned.

Very truly yours,

^$$$

J. A. Verling Superintendent cc: Director Of Management & Program Analysis v' United States Nuclear Regulatory Commission Washington , D. C. 20555 D. L. Wigginton, BVPS Licensing Proj ect Manager United States Nuclear Regulatory Commission Washington, D. C. 20555 D. A. Beckman, Nuclear Regulatory Commission, King of Prussia, PA G. A. Olson, Secretary, Prime Movers Committee - EEI