ML20212G829
| ML20212G829 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna, 05000000 |
| Issue date: | 01/15/1987 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION (ADM) |
| References | |
| 86-677B, IEB-86-003, IEB-86-3, NUDOCS 8701210193 | |
| Download: ML20212G829 (3) | |
Text
m.
VINGINIA ELucTHIC AND PownN COMI*ANY IEB 86-03 Hici M ox n, Va uc ix A ununt W. L. STatWAltT Vaca I*mamspawr Noctuan OranATIONm January 15, 1987 United States Nuclear Regulatory Commission Serial No.
86-677B Attention: Document Control Desk N0/RCB:dmk Washington, D.C.
20555 Docket Nos.
50-280 50-281 50-338 50-339 License Nos.
DPR-32 DPR-37 NPF-4 NPF-7 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 NORTH ANNA POWER STATION UNITS 1 AND 2 I.E. COMPLIANCE BULLETIN 86-03 POTENTIAL FAILURE OF MULTIPLE ECCS PUMPS DUE TO SINGLE FAILURE OF AIR-OPERATED VALVE IN MINIMUM FLOW RECIRCULATION LINE In our letters serial numbers86-677 and 86-677A dated November 12, 1986 and December 15, 1986 respectively, we reported that we were investigating the design and operation of the minimum flow recirculation valves in the Emergency Core Cooling System (ECCS).
We have completed our investigation and our conclusions regarding the potential for common mode failure identified in IE Bulletin 86-03 are provided below.
As stated in our previous letters, the specific concern identified in IE Bulletin 86-03 is not applicable because the minimum flow recirculation valves are motor operated valves which fail as-is rather than air operated which fail shut.
A concern was raised during our investigation, however, regarding the possible failure of recirculation valves to reopen upon demand after having been shut in accordance with procedures. Further analysis has shown that this concern can be addressed through appropriate provisions in station operating procedures.
These provisions will assure the availability of a recirculation path for those events which result in activation of safety injection (SI) with subsequent repressurization of the reactor coolant system to the point of dead-heading the high head SI pumps before SI termination criteria are satisfied.
North Anna has issued a Standing Order which will remain in effect until its provisions are incorporated into the next revision of the Emergency Operating Procedures. This revision will take place by April 30, 1987. Surry will revise the applicable Emergency Operating Procedures prior to start up from the current outages.
8701210193 870115 b
r The information contained in the letter is true and accurate to the best of my knowledge and belief. If you have any questions concerning this matter, please do not hesitate to contact me.
Very truly yours,
-A
.d, W. L. Stewart h
1 e
de i
4 i
i i
I cc:.U. S. Nuclear Regulatory Conunission 101 Marietta Street, N.W.
Suite 2900
-Atlanta, GA 30323 Mr. W. E. Holland NRC Senior Resident Inspector Surry Power Station Mr. J. L. Caldwell NRC Senior Resident Inspector North Anna Power Station s
i I
an
.I
,.m..v.
,,cy._., __., _,.. -,,_- _
-.... -w.-.m,.,w~-,_,-.--,.www_,.
,~yr.w..,...-.,=.m.,-
-.,,e