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The inspectors identified a Green NCVof 10 … The inspectors identified a Green NCVof 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, in that PPL did not implement timely corrective actions to preclude repetition of a significant condition adverse to quality. Specifically, actions taken to address causes of the Unit 1 high pressure coolant injection (HPCI) stop valve failure to close in 2006 did not prevent the same HPCI stop valve from failing to close on August 18, 2009. In both cases, the stop valve failure to close rendered this single train HPCI system inoperable as it was unable to meet the 30 second injection response time as described in the design basis. Corrective maintenance was performed on the valve and the issue was entered into PPL\'s CAP. The finding is more than minor because it adversely affected the performance attribute of the Mitigating Systems cornerstone objective, to ensure the availability, reliability, and capability of equipment that respond to initiating events to prevent undesirable consequences. Specifically, a full closed stop valve indication resets the HPCI ramp generator via a lower limit switch. Without this reset, the governor is unprepared to restart the turbine from an idle state during a designed basis event. The inspectors assessed this finding in accordance with IMC 0609, Attachment 4, Phase 1 -Initial Screening and Characterization of Findings and determined the finding to be of very low safety significance because it did not result in an actual loss of safety function for greater than the Technical Specification allowed outage time. The finding was determined to have a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, because PPL did not take appropriate corrective actions to address safety issues in a timely manner, commensurate with their safety significance and complexity (P.1(d)). Specifically, PPL did not appropriately implement corrective actions following the 2006 failure of the HPCI stop valve.g the 2006 failure of the HPCI stop valve.
23:59:59, 30 September 2009 +
23:59:59, 30 September 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>.
00:37:55, 21 February 2018 +
23:59:59, 30 September 2009 +