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A self-revealing Green NCV of 10 CFR 50 Ap … A self-revealing Green NCV of 10 CFR 50 Appendix B, Criterion XVI was identified for inadequate corrective actions which resulted in the 1C CCW Pumps circuit breaker failing to operate when required. The combination of inadequate tolerances, manipulation of the breaker foot pedal, and the interlock plunger being bound in the interlock bar resulted in the circuit breaker experiencing a trip free operation during its demanded closing operation. During the time the 1C CCW Pump was inoperable, the 1A CCW Pump would not have restarted during LOSP or SI conditions due to a latent failure of its circuit breaker. Thus, a loss of safety function existed for approximately seven hours and fifteen minutes. Because the latent failure of the 1A CCW pump was not a trendable or foreseeable failure, no performance deficiency was identified. The NRC reviewed both breaker failures for a common performance deficiency and none was identified. This finding has been entered into the licensees CAP as CR 2007108601. The licensees failure to ensure the interlock plunger was correctly aligned to allow proper operation of the 4160 volt 1C CCW pump circuit breaker is a performance deficiency. This finding is more than minor because it affected the equipment reliability attribute of the Mitigating Systems cornerstone. The cornerstone objective of ensuring the availability, reliability, and capability of systems responding to initiating events to prevent undesirable consequences was not met. The NRC performed a Phase 3 Significance Determination of the performance deficiency and concluded the finding was of very low safety significanceinding was of very low safety significance +
23:59:59, 31 March 2008 +
23:59:59, 31 March 2008 +
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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>.
03:04:21, 30 May 2018 +
23:59:59, 31 March 2008 +