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The inspectors identified a finding of ver … The inspectors identified a finding of very low safety significance (Green) involving a non-cited violation of 10 CFR 50 Appendix B, Criterion XVI, \"Corrective Action,\" for Exelon\'s failure to promptly identify and correct a condition adverse to quality associated with the January 2009 failure of the reactor building to torus vacuum breaker system. Specifically, Exelon did not promptly identify and correct an inadequate instrument air flow capacity condition associated with the reactor building to torus vacuum breaker trip valve. Due to the inadequate corrective actions, the reactor building to torus vacuum breaker system experienced a subsequent failure in April 2009. Exelon entered this issue into their corrective action program as I R 1088325 to evaluate the corrective actions needed to address this issue. The finding was determined to be more than minor because the performance deficiency was associated with the containment attribute of the barrier integrity cornerstone and adversely impacted the cornerstone objective of providing reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. The inspectors evaluated the finding using IMC 0609, \"Significance Determination Process,\" Attachment 0609.04, \"Phase 1 - Initial Screening and Characterization of Findings,\" Table 4a, for the Barrier Integrity Cornerstone. Specifically, since all four containment barrier screening questions were answered \"no,\" the finding was determined to be of very low safety significance (Green). In addition, the failure did not represent an actual open pathway in the physical integrity of the reactor containment. This finding has a cross-cutting aspect in the area of problem identification and resolution because Exelon failed to thoroughly evaluate the condition adverse to quality and appropriately address the cause. (P.1.(c))appropriately address the cause. (P.1.(c)) +
23:59:59, 30 September 2010 +
23:59:59, 30 September 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>.
00:41:23, 21 February 2018 +
23:59:59, 30 September 2010 +
Inadequate Corrective Actions Associated With the Reactor Building to Torus Vacuum Breaker Trip Valve Failures +