ML19257C637

RO-80-3/01P:on 800124,analysis Showed That,During Postulated Seismic Event,Pipe Support H-95 on Component Cooling Water Sys Line CC-323 Would Receive Overstress.Support H-95 Will Be Altered to 3-way Restraint

ML19257C637
Person / Time
Site:	Beaver Valley
Issue date:	01/24/1980
From:	Werling J DUQUESNE LIGHT CO.
To:
References
NUDOCS 8001290526
Download: ML19257C637 (2)

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MM (412) 471. 0 00 435 5.ath Avemue Pit 4 bur;h, Ponesyhama e2a DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 January 24, 1980 BVPS: JAW:771 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 LER 80-3/0lP Mr. B. H. Grier, Director of Regulation United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19405

Dear Mr. Grier:

In accordance with Technical Specification 6.9.1.8.1, the following occurrence is reported. The occurrence was discussed with Mr. D. A. Beckman, NRC Resident Inspector, at 0830 and 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> on January 24, 1980.

On January 24, 1980, a problem concerning an overstress condition during a postulated seismic event was confirmed by Duquesne Light Company Mechanical Engineering Department. This problem is associated with pipe support H-95 on Component Cooling Water System line CC-323 in which NUPIPE analysis showed that an overstress condition equal to approximately 2.5 times the allowable stress caused by a high bending moment is predicted to occur during a postulated seismic event.

The plant is presently in Operational Mode 6. The, significance of an overstress condition during a scismic event while in Mode 6 is the possible loss of the Residual Heat Removal System.

Corrective action in the form of alteration of support H-95 to a thret-way restraint will be implemented as soon as possible.

Very truly yours, hv)

J. A. Werling Superintendent dDgj/

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Hr. B. II. Grier January 24, 1980 BVl'S : J AW : 771

• Page 2 cc: Director Of Management 6. Program Analysis w/

United States Nuclear Regulatory Commission Washington, D. C. 20555 D. L. Wigginton, BVPS Licensing Project 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 - EE1 A. W. Schwencer United States Nuclear Regulatory Commission Washington, D. C. 20555

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