ML20094P612
| ML20094P612 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/14/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, John Miller Office of Nuclear Reactor Regulation |
| References | |
| 496, NUDOCS 8408170300 | |
| Download: ML20094P612 (3) | |
Text
o VIRGINIA ELucTRIC AND PownR COMPANY RIcnwoxn,VIROINIA 20261 W.L.SrnwAnt Vaca Punsanant August 14, 1984 Ncctuam oranATIONS Mr. Harold R. Denton, Director Serial Nos.
496 Office of Nuclear Reactor Regulation N0/JHL/Ims Attn:
Mr. James R. Miller, Chief Docket No.
50-338 Operating Reactors Branch No. 3 License No.
NPF-4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen,:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NO. 1 RELIEF REQUEST In accordance with 10 CFR 50.55a, paragraph (g)(5), we are requesting relief from hydrostatic testing requirements for North Anna Unit No. I as described below.
ASME XI, 1974 Edition with Summer 1975 Addenda, Subsection IWA-4000, requires hydrostatic testing af ter weld repairs.
Two 150 lb. cast body gate valves (MOV-RS-ISSA and MOV-RS-155B) located on the suction lines to the outside Recirculation Spray Pumps (line numbers 12"-FS-7-153A-Q2 and 12"-RS-8-153A-Q2) were replaced with two 300 lb.
forged body gate valves (see enclosed figure).
These valves have been replaced because of leakage problems.
The quality of the welds joining the new valves to the piping have been tested by liquid penetrant examination and by 100% radiography.
The welds have also been ultrasonically tested.
ANSI B31.7-1969 vith addenda through 1970, Code Cases 78, 81, 83R and 115, requires pressure testing the welds to either 1.25 times the design pressure by hydrostatic test or 1.20 times the design pressure by pneumatic test.
Design pressure for these lines is 55 psig, resulting in a required hydrostatic test pressure of 68.75 psig or a pneumatic test pressure of 66 psig.
The welds on the downstream side of these valves were successfully tested hydrostatically.
The inability to test the welds on the upstream side of the valves is because these lines are open-ended at the containment sump and an effective seal cannot be maintained.
During attempts to seal these lines so they can be hydrostatically tested, workers spent many hours in a radiation area.
Additional radiation exposure would be accumulated by workers, in the sump area, to test these welds.
During the recently completed pressure test of the reactor containment, the welds on both sides of the new valves were exposed to the test pressure (44.4 psig) for the duration of the test. No leakage was observed.
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8408170300 840814
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Vamosuu Es.aCTRIC AMD Powsm Courawr m Harold R..Denton
- We ' have determined that the examinations already performed ' on these. welds provide adequate indication of weld integrity. Therefore, hydrostatic testing of these welds should not be necessary.
Enclosed is a check for $150.00 for the application review fee.
~ Approval of.this relief request :is needed prior to Unit 1 startup which is currently scheduled for September 1, 1984.
Very truly yours, 9
s W. L. Stewart Enclosure l
[
cc:
Mr. James P. O'Reilly Regional Administrator Region II Mr. Richard C. DeYoung
(
Office of Inspection and Enforcement
(
Washington, D. C. 20555 Mr. M. W. Branch NRC Resident Inspector North Annna Power Station l
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