U-603204, Final Part 21 Rept 21-99-003 Re Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Supplier Trentec for Westinghouse Breaker 1AP05EH.Issue Determined Not Reportable Per 10CFR21

Final Part 21 Rept 21-99-003 Re Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Supplier Trentec for Westinghouse Breaker 1AP05EH.Issue Determined Not Reportable Per 10CFR21

ML20206E064
Person / Time
Site:	Clinton
Issue date:	04/30/1999
From:	Mcelwain J ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-99 21-99-003, 21-99-3, U-603204, NUDOCS 9905050003
Download: ML20206E064 (2)

Text

llhnois Power Company w P.O. Box 678 Clinton. it. 61727 Tel 217 935-8881 x3 BOO Fax 217 935-4632 John P. McElwain Chief Nuclear Officer P(MMER' a , uom4 4F.140.

nwa compan April 30, 1999

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Docket No. 50-461 10CFR21.21 Document ControlDesk Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

10CFR21 Final Report 21-99-003: Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Sunolier Trentec

Dear Madam or Sir:

Clinton Power Station (CPS) noti 6ed the NRC in a letter dated March 12,1999, that an evaluation under the provisions of 10CFR, Part 21, was not complete for a

- deficiency' identified in the commercial grade dedication process used by circuit breaker refurbishment supplier Trentec. The evaluation is now complete and this letter provides the final report on this issue. CPS has concluded that this issue is not reportable under the rule.

On January 15,1999, the CPS Quality Assurance (QA) Department identified that the commercial grade dedication process used by Trentec for Westinghouse circuit breaker (I AP05EH) serial number OlYN002 B2 SER 1 did not ensure its desi,in configuration was maintained. QA personnel identified this issue during a surveillance ofTrentec.

Trentec had purchased a commer.:ial grade Ratchet and Cam Assembly from the original equipment manufacturer and de.licated it for use in a safety-related Westinghouse circuit breaker. Trentec disassembled the Ratchet and Cam Assembly, verified critical characteristics and reassembled the unit. However, the process did not ensure the unit was reassembled to the configuration that it was purchased, nor did it ,g verify like-for-like characteristics of spacers and the ratchet wheel thickness within the assembly. The circuit breaker with the potentially deficient unit was thoroughly tested at the Trentec facility and at CPS prior to installation. At the time the deSciency was discovered, the circuit breaker was installed at the Unit Auxiliary Transformer IB Feed to 6.9 kilovolt Bus IB. To determine the impact of the deficiency on the installed breaker, the breaker needed to be removed from its cubicle and inspected. Plant conditions at that time prohibited removing the breaker, h,tf

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U-603204 Page 2

, ' The investigation determined that this circuit breaker was the only CPS breaker having this concern. Condition Report 1-99-01-136 was initiated to track investigation and resolution of this issue.

CPS has now completed qualification testing of a prototype breaker with acceptable results. In addition, the installed breaker has been inspected and the Ratchet and Cam Assembly was found to be in accordance with the design configuration. Based on the acceptable completion of these activities, the evaluation of this issue concludes that the installed breaker is acceptable and this issue is not reportable under the provisions of ,

10CFR, Part 21. l l

Additional information about this issue may be obtained by contacting R. D.  !

Weber, Procurement Engineering, at (217) 935-8881, extension 3785. i I

Sincerely yours, l John P. McE wam ChiefNuclear Officer RSF/krk cc: NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Regional Administrator, Region III, USNRC Illinois Department ofNuclear Safety INPO Records Center Trentec l

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