ML20246D352

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Provides Info Re Pressurizer Safety Valve loop-seal Temps at Facility,Per 890127 Commitment.Results of Calculations Concerning PORV Loop Seal Temps Indicate That Util Can Operate PORVs at Lower Temp
ML20246D352
Person / Time
Site: Beaver Valley
Issue date: 08/08/1989
From: Sieber J
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM TAC-62894, NUDOCS 8908280019
Download: ML20246D352 (2)


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I v Ss nt Nuow Group M1216G5255 August 8, 1989 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 NUREG-0737; II.D.1

' Gentlemen:

This submittal provides .information regarding the pressr.rizer-safety valve loop-seal temperatures at Beaver Valley, Unit No. 2, and .

satisfies our commitment as documented in our submittal dated January -

27,. 1989.

On- October- 14, 1988, the NRC requested additional information to support their review 'of: NUREG-0737 item II.D.1; Relief and Safety Valve -Testing. Our response (January 27, 1989) was complete for each quesuion except for item 8e. Therein we committed to measure-the pressurizer safety valve loop-seal temperatures and compare the results with the assumptions of the thermal-hydraulic analysis of the-pressurizer safety / relief valve discharge. piping. This analysis'is based on a loop-seal temperature. of 400*F upstream of the safety-valves.

The . loop-seal temperatures were measured and all points exceeded' the 400*F assumed in the stress calculations and fluid calculations.

Therefore, the existing pipe stress and fluid calculations for forcing functions applied to safety valve discharge forces ~are acceptable

.In addition to. the above, we have re-evaluated the calculations

-cssociated with the PORV loop-seal temperatures to allow for lower temperatures. The results . indicate we can operate the PORV's at a lower loop-seal temperature and that the thermal-hydraulic analysis

-results are still acceptable. We have therefore lowered the' previously reported temperatures of 400*F, which are maintained by heat tracing, to the following values:

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.e908280019 890808 F

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Beaver Valley Power Station, Unit No. 2 '

Docket No. 50-412, License No. MPF-73 Page 2  ;

1 POBV Reauired Loon-Seal Temperature PCV455C 360*F PCV455D 350*F PCV456 360*F If you have any questions regarding this submittal, please call me or members of my staff.

Very truly yours, Y

J. D. Sieber Vice President Nuclear Group cc: Mr. J. Beall, Sr. Resident Inspector Mr. W. T. Russell, NRC Region I Administrator Mr. P. Tam, Sr. Project Manager IF

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