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The inspectors identified a Non-cited viol … The inspectors identified a Non-cited violation of TS 3.4.10 requirements on Unit3 regarding required components, when plant operation continued although a structural flaw in Class 2 main steam isolation valve steam trap piping had been identified. As a result of using an incorrect drawing in assessing the leak, plant operation continued although a plant shutdown should have been initiated. The licensee documented this in CR 2009-15284.The finding was more than minor because it affected the RCS equipment and barrier performance attribute of the Barrier Integrity cornerstone and the un-isolable through wall leak challenged the integrity of the main steam system for isolating steam generator tube ruptures. Using Manual Chapter 0609, Attachment 0609.04, Phase 1 screening, this finding was determined to be of very low safety significance because all containment barrier characterization answers marked as No. The cross-cutting element of Human Performance, Decision Making, Conservative Assumptions & Safe Actions (H.1 (b)) was affected when the licensee did not use conservative assumptions in evaluating a Class 2component flaw and its TS implications, and did not demonstrate that continued operation with the crack was safe in order to proceedon with the crack was safe in order to proceed +
23:59:59, 30 June 2009 +
23:59:59, 30 June 2009 +
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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>.
00:37:29, 29 October 2017 +
23:59:59, 30 June 2009 +
Failure to Implement TS Requirements Regarding Structural Integrity of Code Class 2 Main Steam Isolation Components +