05000313/FIN-2008003-07
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Finding | |
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Title | Failure to Adequately Monitor the Performance of the Unit 1 Emergency Switchgear Chillers |
Description | The inspectors identified a noncited violation involving the licensees failure to adequately monitor the performance of the emergency switchgear chillers in accordance with 10 CFR 50.65 (a)(2). Specifically, while re-evaluating the systems\' performance for 10 CFR 50.65 (a)(1) status as a corrective action in response to a previous noncited violation for failure to adequately monitor the performance of the system, the licensee inappropriately determined that two independent functional failures should be counted as one based on time between failures. The extra failure would have resulted in exceeding the licensee\'s performance criteria for these components. The licensee entered this issue in their corrective action program as Condition Report ANO-1-2008-0360. The finding was more than minor because it was similar to nonminor Maintenance Rule Example 7.b in NRC Manual Chapter 0612, Appendix E, Examples of Minor Issues, in that the failure to demonstrate effective control of performance or condition and not putting the affected structure, system or component in (a)(1), necessarily involved degraded system performance. This finding had very low safety significance because the failure to properly categorize failures in accordance with the Maintenance Rule Program did not create, in itself, additional operability or functionality concerns. This finding was determined to have a cross-cutting aspect in the area of Human Performance associated with Decision Making H.1(b), in that the licensee did not use conservative assumptions and failed to verify the validity of the underlying assumptions used when evaluating the performance criteria of the emergency switchgear chillers for classification as 10 CFR 50.65 (a)(1) statu |
Site: | Arkansas Nuclear |
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Report | IR 05000313/2008003 Section 4OA2 |
Date counted | Jun 30, 2008 (2008Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | L Ricketson P Elkmann G George S Graves A Sanchez W Walker W Sifre J Josey S Alferink C Young G Apger S Makor B Rice |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Arkansas Nuclear - IR 05000313/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2008Q2
Self-Identified List (Arkansas Nuclear)
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