ML19354E174

Provides Current Status of Ds Breaker Insps for Plant Following Completion of Recent Unit 1 Refueling Outage & Advises That Remaining Ds Breaker Insps Will Be Completed by End of Upcoming Unit 2 Refueling Outage

ML19354E174
Person / Time
Site:	Braidwood
Issue date:	01/22/1990
From:	Richter M COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-88-001, IEB-88-1, NUDOCS 9001290165
Download: ML19354E174 (2)

Text

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L One FirO Nabonel Plaza. CNca00. Hhnois ll .e .

l Address Reply to; Post Omco Box 767 gl :$' w CNoegg Minois 60000 0767 January 22, 1990 Mr. A. Bert Davis Reglonal Administrator

. U.S. Nuclear Regulatory Conunission Region III 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Braidwood Station Units 1 and 2-

-Supplenental Response to NRC Bulletin 88-01 NRC Docket Nos. 50-456 and 50-457 References (a) NRC Bulletin 88-01, dated February 5, 1988.

(b) W.E. Morgan letter to A.B. Davis, dated April 8, 1988.

(c) W.E. Morgan letter to A.B. Davis, dated June 27, 1988.

LDear Mr'. Davis

. Reference (a), addressed to all holders of' operating licenses o::-

construction permits for nuclear power reactors, provided information on Westinghouse series _ DS circuit breakers and safety concerns associated with their use.__ Addressees-using these breakers in Class 1E se rice were requested to perform and document inspection of the welds on-the. pole shafts and >

inspection of: the alignment in the breaker' closing mechanism.

For Braidwood Station, References (b) and (c) presented tm. " M te of.the inspections on the reactor trip / bypass breakers, and providem a r.hedule for the inspection of the-remaining Westinghouse DS breakers. This lene.-

provides the current status =of the DS breaker inspections for Braidwood Station following completion of the recent Unit I refueling outage (Fall 1989). The progress of the breaker inspectious is ahead of the schedule previously presented in Reference (b).

As reported in- Reference (b), there are 73 breakers, consisting of Westinghouse DS-206 and DS-416 circuit breakers, which require inspection at Braidwood Station. At this time, 69 of the 73 breakers have had "short-term" and t'long-term" inspections - perf ormed as defined in Reference (a). Pole shafts were replaced on those breakers which feiled to meet all of the weld-acceptance criteria identified in Reference (a). Breaker alignment inspections were only performed with originally installed pole shafts, or replacement pole shafts, which met the weld acceptance criteria. The results of the breaker inspections' are presented in ttw following table.

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Type 41h Iype 206 No. of breakers inspected- 9 60

. _No. of breakers which had pole 8 57

,c; shafts replaced due to welds t No. of breakere requiring corrective 0 0 action for alignment As' reported in Reference (b), the Unit i reactor trip / bypass breckers,

.which are DS-416 circuit breakers, were initially inspected to Westinghouse

• Technical Bulletin NSID-TB-87-11 prior to the issuance of Reference (a).

Therefore, the pole shaft welds for the breakers were not initially inspected for porosity, an inspection parameter which was added to the Westinghouse Bulletin by Reference (a). The Unit i reactor trip / bypass breakers were reinspected to the additional acceptance criteria provided by Reference (a),

and these inspection results are reflected in the previous table. '

i At this time it is expected'that the remaining DS breaker inspections will t'e completed by the end of the upcoming Unit 2 refueling outage (scheduled .

to begin in March.1990). A final response, to Reference (a) for Braidwood "

Station-will be submitted 30' days following the completion of the-Unit 2

/ refueling outage.

Please direct tm r questions thtt you may'have concerning this response .

to this office. ~'

Respectfully,

- M.H. Richter Generic Issues Administrator cc: Document Control Desk - NRR Senior Resident Inspection - Braidwood S. Sands - Project Manager, NRR SUBSCRIBED AND SWO to before me this h g day [~[~hg-[~((~[h'[~.}l; 3ry 3 it o A

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ll PATRICIA LYNN MARLOW l A. , 90

' ' ll NOTARY PUBUC, ST',TE OF ILLIN0IS l;

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