Finding | |
|---|---|
| Title | Inadequate Calculations/Analyses for Essential 4160 Vac Circuit Breaker Close/Open Coils |
| Description | A finding of very low safety significance (Green) and associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the inspectors for the failure to assure and verify that adequate control voltage was available for the close and open coils of the 4160VAC [volts alternating current] safety-related breakers. The licensee entered this performance deficiency into its corrective action program, performed a simplified evaluation to determine the worst case available close coil voltage at the worst case breaker fed from the 4160VAC essential switchgear, and conducted testing to demonstrate a reasonable assurance of operability. The finding was determined to be more than minor because the failure to assure and verify that adequate control voltage was available to close and open the 4160VAC breakers could have affected the capability of emergency diesel generators and other safety-related equipment to respond to initiating events. The issue was of very low safety significance because the inspectors determined it was a design deficiency that did not result in actual loss of safety function. The inspectors determined there was no cross-cutting aspect associated with this finding. (Section 1R21.3.b.(1) |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2008006 Section 1R21 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dunlop S Sheldon B Palagi H Campbell J Tapp C Acosta Acevedog Nicely A Stone |
| INPO aspect | |
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Finding - Duane Arnold - IR 05000331/2008006 | |||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2008Q1
Self-Identified List (Duane Arnold)
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