05000313/FIN-2008003-01
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Finding | |
|---|---|
| Title | Failure to Adequately Monitor the Performance of the Alternate AC Diesel Generator |
| Description | The inspectors identified a noncited violation of 10 CFR 50.65 (a)(2) for the licensees failure to demonstrate that alternate AC diesel generator performance was being effectively controlled through preventative maintenance. The licensee maintained the diesel generator in a Maintenance Rule a(2) status but the diesel had suffered ten functional failures (for Maintenance Rule scoped functions) between April 2006 through March 2008. Functional failures included 8 failures of the starting air compressor and 2 failures of building ventilation. The licensee maintained separate performance criteria for these components but had failed to properly characterize the malfunctions as Maintenance Rule functional failures. The licensee entered this issue in their corrective action program as CR ANO-2-2008-1265. The finding was more than minor because it was similar to non-minor Maintenance Rule Example 7.b in NRC Manual Chapter 0612, Appendix E, Examples of Minor Issues, in that the problem involved degraded equipment performance. This finding had very low safety significance because the finding did not lead to an actual loss of safety function or cause the diesel to be inoperable, nor did it screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding had a cross-cutting aspect in the area of Human Performance associated with decision making H.1(b), in that engineers failed to verify the validity of the underlying assumptions for compressor and building ventilation functional failures when evaluating preventative maintenance effectivenes |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2008003 Section 1R12 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| 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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