ML20092D882
| ML20092D882 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/18/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, John Miller Office of Nuclear Reactor Regulation |
| References | |
| 298, NUDOCS 8406220186 | |
| Download: ML20092D882 (2) | |
Text
.
(
VINGINIA ELucTHIC AND Powna COMPANY RicnwowI),VINGINIA 202G1 W.L. Stew ur 3,]' ",, l""',,
June 18, 1984 j """'
Mr. Harold R. Denton, Director Serial No. 298 Office of Nuclear Reactor Regulation EC/MGD:jdm:2001N Attention: Mr. James R. Miller, Chief Docket Nos. 50-338 Operating Reactors Branch No. 3 50-339 Division of Licensing Licensing Nos. NPF-4 U.S. Nuclear Regulatory Commission NPF-7 Washington, DC 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION - UNITS 1 AND 2 ENVIR0fMENTAL QUALIFICATION OF ELECTRICAL EQUIPMENT In accordance with 10CFR50.49 paragraph (h) of the Equipment Qualification Rule, we are requesting an extension to March 31, 1985 for completing the environmental qualification of the hydrogen recombiner equipment for North Anna Units 1 and 2.
This extension is requested because we have not been able to procure qualified motors that can be installed in the required location due to space limitations. Motor qualification was conservatively based on worst case post accident containment environmental conditions. We have performed a detailed evaluation of the actual environmental conditions to which the motors are exposed, resulting in less harsh conditions. We should be able to procure motors qualified to the revised environmental conditions.
AJustificationforContinuedOperation(JCO)wassubmittedonAugust24, 1981 (letter Serial No. 330) for Unit 1 and on September 4,1981 (letter Serial No. 355) for Unit 2.
This JC0 has been reviewed by Franklin Research Center and found to be acceptable. We have since re-reviewed the JC0 and still find it to be applicable. A copy of the JC0 is attached.
Thank you for your consideration in this matter.
V ry truly yours, YJ W. L.
tewart cc: Mr. James P. O'Reilly Mr. M. W. Branch Regional Administrator NRC Resident Inspector Region II North Anna Power Station dn8 8406220186 840618
[ fl PDR ADOCK 05000338 p
Attachment to Letter Serial No. 298 Hydrogen Recombiners (1-HC-HC-1, 2-HC-HC-1)
Two recombiners are available for North Anna Units 1 and 2.
The recombiners are redundant and can be used on either unit. The experience detailed in Rockwell International review document AI-N139TI120010, p.
42-44, "Three Mile Island Recombiner Post-LOCA Operation," shows that the TMI-2 operational experience of a recombiner with the same or similar (e.g.,
insulation class) components performed for as long as it was needed and in an environment more severe than specified for either North Anna Unit.
The North Anna hydrogen recombiners can therefore be relied upon until the above qualification / replacement activities are completed.