05000461/FIN-2013002-04
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | UN-FUSED DC Ammeter Circuits Results in Unanalyzed Condition |
| Description | Clinton Power Station Unit 1 Operating Licensee Condition 2.F required, in part, that the licensee implement and maintain in effect all provisions of the approved Fire Protection Program as described in the Final Safety Analysis Report, as amended, and as approved in the Safety Evaluation Report (NUREG-0853), dated February 1982 and Supplemented Numbers 1 through 8. The Clinton Power Station UFSAR, Appendix F, Safe Shutdown Analysis, Section 1.5, Associated Circuits, stated, in part, that at Clinton Power Station, there were no associated non-safe shutdown cables that were not electrically protected and shared a common enclosure with safe shutdown cables. Contrary to the above, on December 8, 2011, the licensee identified that non-safe shutdown cables that shared a common enclosure with safe shutdown cables were not electrically protected. Specifically, the licensee identified that the battery ammeter circuits routed from the DC motor control centers to the ammeters located in the Control Room were not fused. These cables were routed in trays and installed in panels with other safe shutdown cables. During a fire event in the Control Room, fire-induced failures could have damaged the ammeter circuit and could have resulted in damaging other safe shutdown cables that are in direct physical contact with these cables in different fire zones. The licensee completed a fire risk evaluation for worst case fire scenarios in the Control Room and concluded that the delta core damage frequency (ACDF) from a fire due to the un-fused ammeter circuit was 8.26E-8 per year. The evaluation also concluded that for all postulated fire scenarios in the Control Room; at least one safe shutdown division would not be impacted by the fire. The inspectors reviewed the licensees risk evaluation and based on the small calculated ACDF and at least one safe shutdown train would not be affected by all postulated fire scenarios in the Control Room, the inspectors determined that the issue was of very low safety-significance. The licensee entered this violation into its corrective action program as AR 01299460. The licensee submitted LER 05000461/2011-007-00 to report this issue. Refer to Section 4OA3.2 of this inspection report for the review and closure of the LER. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2013002 Section 4OA7 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Dahbur R Orlikowski B Kemker S Mischke D Lords J Bozga A Shaikh V Myers |
| Violation of: | License Condition - Fire Protection |
| INPO aspect | |
| ' | |
Finding - Clinton - IR 05000461/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Clinton) @ 2013Q1
Self-Identified List (Clinton)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||