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A finding of very low safety significance … A finding of very low safety significance and associated NCV of Technical Specification 5.4.1 was self revealed during the performance of Operating Instruction (OI) 358, Reactor Protection System. Specifically, while transferring the B Reactor Protection System to its alternate power supply, the common suction isolation valve for both trains of shutdown cooling closed, causing a loss of shutdown cooling. The licensee entered the issue into the CAP as CR 593949, and revised OI 358 to prevent a similar condition in the future. The inspectors determined that the issue was a performance deficiency because it was the result of the failure to meet a requirement, and the cause was reasonably within the licensees ability to foresee and correct and should have been prevented. The inspectors determined that the performance deficiency was more than minor and a finding because it was associated with the procedure quality attribute of the Initiating Events Cornerstone and adversely affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown. The inspectors determined the finding was of very low safety significance using IMC 0609 Appendix G, Shutdown Operations Significance Determination Process, Table 1, Losses of Control, and Checklist 7 of Attachment 1, BWR Refueling Operation with RCS Level >23. No cross-cutting aspect was identified for this finding since it did not reflect current performance.since it did not reflect current performance. +
23:59:59, 31 December 2010 +
23:59:59, 31 December 2010 +
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Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
21:45:22, 8 October 2017 +
23:59:59, 31 December 2010 +