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The team indentified a Green finding for l … The team indentified a Green finding for licensees failure to take adequate corrective action for the inadvertent closing of MOV 1CC-252 (Reactor Coolant Pump (RCP) Thermal Barrier Return Flow Isolation Valve) following the start of the standby Component Cooling Water (CCW) pump. As interim corrective action, the licensee revised operating procedures to reflect the issue and initiated compensatory measures which included Standing Instruction 11- 0012 to explain that during conditions where the standby CCW pump starts, a transient high flow can be expected that causes 1CC-252 to automatically close. Permanent corrective actions are still being evaluated by the licensee. The licensee entered this issue into the corrective action program (CAP) as NCR 460686. The licensees failure to take adequate corrective action for the inadvertent closing of MOV 1CC-252 following the start of the standby CCW pump was a performance deficiency. The finding was more than minor because it was affected the Equipment Performance attribute of the Initiating Events cornerstone and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the licensee failed to evaluate the potential for the RCP thermal barrier to isolate following safety injection (SI) or de-energization of a safety bus upon the auto start of the standby CCW pump. The finding was considered to be of very low safety significance because assuming worst case degradation, the finding would not result in exceeding the Technical Specification (TS) limit for any reactor coolant system (RCS) leakage, result in the total loss of a safety function, did not contribute to both the likelihood of a reactor trip or the likelihood that mitigating equipment or functions would not be available, and did not increase the likelihood of a fire or internal/external flooding. Because the licensee failed to thoroughly evaluate problems such that the resolution(s) address causes and extent of conditions, as necessary, this finding is assigned a crosscutting aspect in the corrective action program of the Problem Identification and Resolution area.roblem Identification and Resolution area.
23:59:59, 30 June 2011 +
23:59:59, 30 June 2011 +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
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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>.
00:44:23, 21 February 2018 +
23:59:59, 30 June 2011 +