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A self-revealing finding of very low safet … A self-revealing finding of very low safety significance (Green) was identified for Dominion\'s failure to properly plan work activities associated with the Unit 2 \'D\' circulating water (CW) bay outage in accordance with Dominion procedure WM-M- 3000, Managing Complex Work. The work plan failed to properly sequence work activities to prevent fouling of the \'C\' CW screens. The subsequent fouling of the \'C\' CW travelling screen resulted in an automatic trip of the \'C\' CW pump. Loss of the \'C\' CW pump, coupled with the unavailability of the \'D\' CW pump, required the operators to manually trip the reactor. Dominion entered this issue into their corrective action program (CR370363). This finding is more than minor because it was similar to NRC IMC 0612, Appendix E, Examples of Minor Issues, Example 4b, in that the implementation of the inadequate work plan caused the loss of the \'C\' CW pump, and required the operators to manually trip the reactor. The inspectors determined this finding was associated with the Human 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 power operations. Specifically, the work plan for the \'D\' CW bay outage did not properly sequence the work, which led to the loss of the \'C\' CW pump and required the operators to manually trip the reactor. The inspectors determined the significance of the finding using IMC 0609.04, Phase 1 - Initial Screening and Characterization of Findings, and determined that the finding was of very low safety significance (Green) because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. The inspectors determined that this finding had a cross-cutting aspect in the Human Performance cross-cutting area, Work Control component, because Dominion did not appropriately plan the bay cleaning and demucking (removal of scraped material) work activity to address the risk of the activity to impact the other CW bays (H.3(a)).vity to impact the other CW bays (H.3(a)).
23:59:59, 30 June 2010 +
23:59:59, 30 June 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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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>.
00:39:54, 21 February 2018 +
23:59:59, 30 June 2010 +