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A self-revealed finding of very low safety … A self-revealed finding of very low safety significance (Green) and associated NCV of 10 CFR 50.65(a)(4) was identified for failure to assess and manage risks associated with maintenance activities. The applicable maintenance activities occurred between July 1, 2010, and August 17, 2010, on Unit 2. The inspectors determined that the licensees actions to assess and manage the risks associated with maintenance activities did not prevent a transient that upset plant stability, and were identified as a performance deficiency. The inspectors identified that this finding has a cross-cutting aspect because the licensee failed to verify the validity of the underlying assumptions supporting the work activity and identify possible unintended consequences (H.1(b)). The inspectors determined the finding was more than minor because the performance deficiency adversely affected the Initiating Events Cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during power operations. Using IMC 0609, Table 4a, Initiating Events Cornerstone column, Transient Initiators subsection; the question: Does the finding contribute to both the likelihood of a reactor trip AND that mitigation equipment or functions will not be available? was answered, No by the inspectors because all mitigating functions were available after the event. Therefore, this finding screens as Green, or very low safety significance.as Green, or very low safety significance. +
23:59:59, 30 September 2010 +
23:59:59, 30 September 2010 +
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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J Mcghee +, C Mathews +, M Ring +, B Cushman +, Karla Stoedter +, Jason Draper + and Ellery Coffman +
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>.
21:48:34, 8 October 2017 +
J Mcghee +, C Mathews +, M Ring +, B Cushman +, Karla Stoedter +, Jason Draper + and Ellery Coffman +
23:59:59, 30 September 2010 +