ML19324C150

Responds to NRC Bulletin 88-010,Suppl 1 Re Molded Case Circuit Breakers.Program Initiated to Ensure That Breakers Can Perform Safety Functions

ML19324C150
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	11/10/1989
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BVY-89-105, IEB-88-010, IEB-88-10, NUDOCS 8911150076
Download: ML19324C150 (3)

Text

[ -

. VBRM2NT YANKEE

' NUCLEAR POWER CORPORATION

• Ferry Road, Brattleboro, VT 053017002 ENGINE IN OFFICE t - bf0 MAIN STM ET DOLTON. MA 01740

[' abDN 779 ( 711 November 10, 1989 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Document Control Desk References n) License No. DPR-28 (Docket No. 50-271) b) Letter, USNRC to All Holders of Operating Licenses or Construction Permits for Nuclear Power Reactors, NVY 88-248,Bulletin 88-10, dated 11/22/88 c) Letter, VYNPC to USNRC, BVY 89-32, Response to Bulletin 88-10, dated 3/31/89 d) Letter, VYNPC to USNRC, DVY 89-62, Supplemental Response to Bulletin 88-10, dated 6/30/89 e) USNRC Bulletin 88-10, Supplement 1, dated 8/3/89 Dear Sir

Subject:

Response to NRC Bulletin 88-10, Supplement 1, Molded Case Circuit Dreakers USNRC Bulletin 88-10 (Reference b)) requested that eddressees take action to provide reasonable assurance that molded case circuit breakers (CB's),

including CB's used with motor controllers, purchased for use in safety related applications without verifiable traceability to the circuit breaker manufacturer (CBM) perform their safety functions. By letters dated March 31, 1989

[ Reference c)) and June 30, 1989 (Reference d)), Vermont Yankee outlined the results, actions taken, and future actions planned as a result of our investiga- -

tion.

t Subsequent to the submittal of these two responses, USNRC Bulletin 88-10, Supplement 1, was issued. This Supplement provided additional actions as a result of clarification of the NRC's position with regard to the original  ;

Bulletin.

As part of these actions, the NRC requested that Licensees review written I reports submitted to the NRC in accordance with Bulletin 88-10 and verify that the responses meet the Bulletin provisions as clarified by Supplement 1 of the ,

subject Bulletin.

Pursuant to this request, Vermont Yankee hereby submits the conclusions of our review of the previously submitted responses to Bulletin 88-10.  !

1 8911150076 891110 PDR M

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PDC: 1 i

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F e, VERMONT YANKEE NUCLEAR POWER CORPORATION U.S. Nuclear Regulatory Commission  ;

November 10, 1989 i Page 2 l r t I

r All previous responses to NRC Bulletin 88-10 have been reviewed against the additional clarification as presented in Bulletin 88-10, Supplement 1. All

! responses are censidered valid with the exception of the following clarifica- l tions ,

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1. NRC Position 1 of Bulletin 88-10, Supplement 1, allows traceability to an l original plant construction order as being sufficient traceability provided  ;

they were received prior to August 1, 1983.  !

Vermont Yankee has thirteen such breakers that were purchased in the I 1970/71 timeframe under our original Construction Purchase Order.

Ther efore, Vermont Yankee will consider these breakers as acceptable for safety related applications.

2. 'NRC Position 4 requests licensees to assess the acceptability of all  !

installed safety related MCCB's that were procured under the same purchase  ;

orders as the non-traceable MCCB's identified in the original response to i Bulletin 88-10. l Vermont Yankee has completed its review of MCCB's installed between t December 1975 and August 1983. This review has identified six installa- l tions which were purchased under previously identified non-traceable r Purchase Orders. These breakers will be handled in accordance with the '

requirements of action items 2, 5, and 6 of Bulletin 88-10 (Reference b)). '

3. NRC Position 5 indicates that non-traceable MCCB's being retained as spares f may not be used in safety related applications even if they have passed all s testing requirements as specified by Attachment 1 of Bulletin 88-10.

This position is contrary to the direction in which Vermont Yankee was pro-ceeding as described in our earlier submittal [ Reference d)). Therefore, ,

in order to comply with the requirements of NRC Position 5 of Bulletin 88-10, Supplement 1, Vermont Yankee will not test the spare MCCB's in stock r

but rather remove them from stock as safety related spares, i CONCLUSIONS  !

In accordance with the requirements of NRC Bulletin 88-10 and 88-10 I Supplement 1, Vermont Yankee has initiated a program to provide reasonable [

assurance that MCCB's purchased for use in safety related applications without .

verifiable traceability to the CBM can perform their safety function.

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. . .o I ,, VERMONT YANKEE NUCLEAR POWEQ CORPORATON

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.Ues. Nuclear Regulatory Commission November 10, 1989 i Pege 3 l

l We trust that the information provided is responsive to the subject

l. Bulleting however, should you have any questions or require additional infor-j .. motion, please do not hesitate to contact us.

. . Very truly yours, i.

k VERMONT YANKEE NUCLEAR POWER CORPORATION f litk Warren P. M,WP yn Vice President, ad l, Manager of Operat

/de cc USNRC Regional Administrator, Region !

USNRC Resident Inspector, VYNPS

.