05000482/FIN-2011007-01
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Finding | |
|---|---|
| Title | Failure to Verify Isolation of Associated Circuits on Isolation Switches |
| Description | The team identified a finding because the licensee was not fully testing the isolation function of local transfer switches located at motor control center breakers for individual components. As a result, the licensee was not performing periodic verifications to confirm that local control circuits would be isolated from the effects of fire damage caused by a control room fire. The licensee documented this deficiency in Condition Report 045434. The failure to maintain adequate written procedures covering fire protection program implementation was a performance deficiency. Specifically, the licensee failed to ensure that component specific transfer switch testing procedures verified proper circuit isolation from the control room in the event of a control room fire. The performance deficiency was more than minor because it was associated with the procedure quality attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The team evaluated the finding using Inspection Manual Chapter 0609, Appendix F, Fire Protection Significance Determination Process, because it affected fire protection defense-in-depth strategies involving post-fire safe shutdown. Using Appendix F, Attachment 2, Degradation Rating Guidance Specific to Various Fire Protection Program Elements, the team determined that the finding constituted a low degradation of the safe shutdown area since the control room isolation feature is expected to display nearly the same level of effectiveness and reliability as it would had the degradation not been present. This finding screened as having very low safety significance (Green). Since the failure to test the isolation function had not been verified since initial installation, the team determined that this failure did not reflect current performance. |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2011007 Section 1R05 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | G Pick G Miller S Alferink J Mateychick B Correll |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2011007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2011Q4
Self-Identified List (Wolf Creek)
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