ML20059E908

Part 21 Rept Re Decreases in Valve Actuator Motor Starting Torques Resulting from Increasing 3-Phase Actuator Motor Temp.Concludes Valves Capable of Performing Intended safety- Related Function

ML20059E908
Person / Time
Site:	Beaver Valley
Issue date:	12/29/1993
From:	Sieber J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-93 NUDOCS 9401130039
Download: ML20059E908 (1)

Text

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December 29, 1993 i JOHN D $lEEtt A (412) 393-5255 Senior Vme Presdent ard f ax (412) 643~8069 Chief Nuclear Of fccer i NacHuar Power Dmuon l U. S. Nuclear Regulatory Commission i Attn: Document Control Desk Washington, DC 20555

Subject:

Beaver Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 Follow-up Response to Potential 10 CFR 21 Condition, Limitorque Corpcration Relianc.e 3-Phase Actuator Motors Ref: 60 Day Interim Report to NRC Dated July 23, 1993 Limitorque Corporation had notified the NRC of a p7tential 10 CFR 21 condition concerning decreases in valve actuator motor starting torques resulting from increasing motor temperature.

Because the evaluation could not be completed within the allowable time frame, a 60 day interim report was submitted, as required by 10 CFR 21. 21 '2 ) (2 ) , on July 23, 1993.

Duquesne Light Company has completed the evaluation relative to the potential 10 CFR 21 concern for all valves associated with .

Generic Letter 89-10 at Beaver Valley Unit 1 and Unit 2. Each valve was evaluated for reduced output torque due to heat effects during mispositioning and subsequent recovery to its correct position. The resulting temperature rise was then added to the accident assumptions based on the valve location. The results of the evaluation concluded that each valve is capable of performing its intended safety-related function.

Should you have any questions associated with this subject, please call J. V. Vassello, Director, Licensing, at (412) 393-5203.

Sincerely, W J.

fh (Mief &

D. Sieber th lI l [)

v' cc: Mr. L. W. Rossbach, Sr. Resident Inspector Mr. T. T. Martin, NRC Region I Administrator .-

Mr. G. E. Edison, Project Manager i

9401130039 931229 i PDR ADOCK 05000334 l S pon 1