ML20246D352
| 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) | |
Text
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.g ever Valley Power Station SNppingport PA15077AC4
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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
.E,DR.ADOCK05000g{2 F
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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