05000317/FIN-2008004-02
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Finding | |
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| Title | Failure to Establish and Maintain Adequate Procedures for 4 kV Circuit breaker Maintenance |
| Description | A self-revealing, NCV of Technical Specification (TS) 5.4.1.a, Procedures, was identified because Constellation did not adequately establish and maintain electrical maintenance procedures for 4 kV circuit breakers such that the procedures incorporated torque values and verification steps to ensure the adjustment setscrew for the trip armature was properly tightened. During a surveillance test, on June 21, 2008, the adjustment setscrew backed out which prevented the 13 SRW pump breaker from opening. Constellation entered this issue into their CAP for resolution as IRE-032-517. The immediate corrective actions following the event included the replacement of the locking setscrew and trip coil. The planned corrective actions included the revision of maintenance orders and procedures to ensure that technicians perform peer verifications and check the tightness of the adjustment setscrew following maintenance activities. This finding is more than minor because it is associated with the procedure quality attribute of the Mitigating System cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding is of very low safety significance because it is not a design or qualification deficiency, did not represent a loss of a safety function of a system or a single Train greater than its TS allowed outage time, and did not screen as potentially risk significant due to external events. This finding has a cross-cutting aspect in the area of problem identification and resolution because Constellation did not implement and institutionalize operating experience (OE), including internal and external OE to change station processes, procedures, and training programs when similar issues of internal and external events occurred on 4 kV circuit breakers that involved inadequate maintenance procedures (P.2.b). (Section 1R19) |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2008004 Section 1R19 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | J Richmond M Davis M Patel S Kennedy N Perry R Rolph J Hawkins |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Calvert Cliffs - IR 05000317/2008004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2008Q3
Self-Identified List (Calvert Cliffs)
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