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A finding of very low safety significance … A finding of very low safety significance was self-revealed on September 16, 2011, when the packing for CV-1057, one of two pressurizer spray control valves, failed resulting in unidentified Primary Coolant System (PCS) leakage in excess of TS limits. As a result, the licensee manually tripped the reactor and declared an Unusual Event was declared. The licensee failed to maintain the configuration of the plant in accordance with the design. No violation of regulatory requirements was identified, however, the licensee failed to implement an Entergy procedure, a self-imposed standard. Contrary to the licensees Configuration Management procedure, EN-DC-105, the intended packing configuration was not installed during RFO 21. Specifically, end rings integral to the design were omitted. As immediate corrective action, the licensee repacked CV-1057 and checked the consolidation of the sister valve, CV-1059. The licensee also entered the issue in their CAP as CR-PLP-2012-04620 and performed a root cause analysis. The inspectors determined the failure of the packing due to inadequate configuration management was a performance deficiency warranting further evaluation with the Significance Determination Process. The performance deficiency was more than minor because it affected the Initiating Events Cornerstone attribute of Design Control and adversely impacted the objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during power operations. Specifically, the issue resulted in PCS leakage greater than TS limits, a manual reactor trip, and declaration of an Unusual Event. The issue screened as Green, or very low safety significance, in a Phase 3 SDP evaluation performed by regional Senior Reactor Analysts. The finding had a cross-cutting aspect in the area of Human Performance associated with the Resources component. Specifically, the licensee failed to ensure that complete, accurate, and up-to-date design documentation, procedures, and work packages were available and adequate to ensure nuclear safety for maintenance on the pressurizer spray control valves (H.2(c)) pressurizer spray control valves (H.2(c))

Discovered date

23:59:59, 31 December 2011 +

Docket

05000255 +

Entergy procedure

EN-DC-105 +

Event date

23:59:59, 31 December 2011 +

Finding integer

2 +

Finding type

Finding +

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WP.3 +

IP 71152, Problem Identification and Resolution (PI&R) +

Inspection report

IR 05000255/2011005 +

Inspector

J Cassidy +, A Scarbeary +, John Ellegood +, Matthew Learn +, Lionel Rodriguez +, Chuck Zoia + and Thomas Taylor +

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>.

19:05:50, 30 September 2017 +

Person