United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9903260199


Illinois Power Company
P.O. Box 678
Clinton, IL 61727
Tel 217 935-8881 x3900
Fax 217 935-4632

John P. McElwain
Chief Nuclear Officer

ILLINOIS POWER
An Illinova Company

U-603182

4F.140

March 12, 1999

Docket No. 50-461 10CFR21.21

Document Control Desk
Nuclear Regulatory Commission
Washington, D. C. 20555

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

Dear Madam or Sir:

On January 15, 1999, the Illinois Power Quality Assurance (QA) Department identified that the commercial grade dedication process used by Trentec for Westinghouse circuit breaker (1AP05EH) serial number 01YN002 B2 SER 1 did not ensure that its configuration was maintained in accordance with its design. QA personnel identified this issue during a surveillance of Trentec, a circuit breaker refurbishment supplier for Clinton Power Station (CPS).

Trentec had purchased a commercial grade Ratchet and Cam Assembly from the original equipment manufacturer and dedicated 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 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. The circuit breaker is currently installed at the Unit Auxiliary Transformer 1B Feed to 6.9 kilovolt Bus 1B and will need to be removed from its cubicle for inspection. Current plant conditions prohibit removing the breaker.

The investigation has determined that this circuit breaker is the only CPS breaker having this concern. Condition Report 1-99-01-136 was initiated to track investigation and resolution of this issue. The CPS evaluation of this issue under the provisions of 10CFR21 has not been completed. The evaluation is expected to be completed by May 17, 1999.


U-603182
Page 2

Additional information about this issue may be obtained by contacting R. D. Weber, Procurement Engineer, at (217) 935-8881, extension 3785.

Sincerely yours,

John P. McElwain
Chief Nuclear Officer

RSF/krk

cc: NRC Clinton Licensing Project Manager
NRC Resident Office, V-690
Regional Administrator, Region III, USNRC
Illinois Department of Nuclear Safety
INPO Records Center
Trentec


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