ENS 40344

v t e ENS Event
16:20 Nov 20, 2003
Title	Low Voltage Circuit Breaker Defect and Noncompliance Report
Event Description	Deviation related to upper stud assemblies for General Electric Nuclear AKR-30 low voltage circuit breakers. The deviation is specific to upper stud assemblies supplied under part number Q139C4632G1 and consist of an incorrect angle between the stud and pivot. Of the fifteen assemblies supplied with possible deviations to AmerenUE, five were returned and ten had been installed in Callaway Plant. The deviation will not prevent the circuit breakers from performing their design basis function at the Callaway Plant, however, the capability of the assemblies is indeterminate for severe faulted conditions. A circuit breaker could fail if an upper stud assembly with identified deviation was installed and the circuit breaker was called upon to interrupt a severe fault. Callaway has concluded that this deviation does not constitute a "defect" as defined in 10CFR Part 21 because the breakers would still perform their design basis requirements and would not create a substantial safety hazard. However, Callaway can not determine if the potential for a significant safety hazard or exceeding of a technical specification safety limit could exist at another nuclear power plant. Received written documentation that the licensee has notified the NRC resident inspector.

ENS 40344 +/-
Where
Callaway Missouri (NRC Region 4)
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+-4.15 h-0.173 days <br />-0.0247 weeks <br />-0.00568 months <br />)
Opened:	David M Epperson 12:11 Nov 20, 2003
NRC Officer:	Jeff Rotton
Last Updated:	Nov 20, 2003
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v t e Emergency Notification System
Callaway with 10 CFR 21.21
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