05000331/FIN-2012002-04
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Finding | |
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Title | Battery Conditions Adverse to Quality Not Promptly Identified |
Description | A finding of very low safety significance and associated NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, was identified by the inspectors on January 23, 2012, for the licensees failure to promptly identify and correct safety-related direct current (DC) battery system conditions adverse to quality. Specifically, several through-lid cracks on the 1D1 and 1D2 125 volts direct current (VDC), and 1D4 250 VDC batteries, that were considered degraded conditions, were not promptly identified by the licensee. The susceptibility and progression of lid cracking was a known condition; however, monitoring of the condition was not adequate to ensure correction of the conditions prior to impacting the qualification of the batteries. The licensee entered the inspectors issues into the CAP as CRs 01727026, 01727028 and 01727030. The licensee performed prompt operability determinations (PODs) that determined the affected DC electrical subsystems were operable, but degraded, pending restoration of the batteries to full qualification (epoxy repairs). The inspectors determined that failing to promptly identify and correct battery lid cracking that impacted qualification represented a performance deficiency because it was the result of the licensees failure to meet a regulatory requirement, and the cause was reasonably within the licensees ability to foresee and correct and should have been prevented. The performance deficiency was determined to be more than minor and a finding because, if left uncorrected, failing to promptly identify and evaluate the operability of a degraded condition would have the potential to lead to a more significant safety concern. The inspectors evaluated the finding in accordance with IMC 0609.04, Table 4a. Because the finding was a qualification deficiency confirmed not to result in loss of operability (Question 1 under the Mitigating Systems Cornerstone column), the finding screened as very low safety significance (Green). The inspectors determined that the contributing cause that provided the most insight into the performance deficiency was associated with the cross-cutting aspect of Human Performance, having Resources components, and involving the licensee maintaining long term plant safety by maintenance of design margin and minimization of long-standing equipment issues. |
Site: | Duane Arnold |
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Report | IR 05000331/2012002 Section 4OA2 |
Date counted | Mar 31, 2012 (2012Q1) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | R Orlikowski T Bilik M Mitchell M Ring L Haeg K Walton J Draper R Murray S Bell |
CCA | H.6, Design Margins |
INPO aspect | WP.2 |
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Finding - Duane Arnold - IR 05000331/2012002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2012Q1
Self-Identified List (Duane Arnold)
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