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Title 10 CFR Part 50, Appendix B, Section … Title 10 CFR Part 50, Appendix B, Section III, Design Control, required, in part, that measures shall be established to assure that applicable regulatory requirements and the design basis are correctly translated into specifications, drawings, procedures, and instructions. Contrary to this, Pacific Gas and Electric failed to establish measures to ensure that applicable regulatory requirements and the design bases were correctly translated into specifications, drawings, procedures, and instructions. Specifically, on May 14, 2010, Pacific Gas and Electric discovered a design deficiency during the final preparation of the Diablo Canyon Power Plant Unit 1 design change package for the safety injection test line optimization modification. The package lacked the required flow restrictors for the reactor coolant pressure boundary isolation valves, resulting in the potential to create loss of reactor coolant system inventory in Mode 4 which would exceed normal charging makeup capability. On June 14, 2010, the licensee determined that this design deficiency impacted the Unit 2 safety injection modification that had been implemented during the most recent refueling outage. Pacific Gas and Electric entered this issue into the corrective action program as Notification 50316384 and initiated corrective actions to install travel limiting stops on all of the new safety injection test line manual valves to limit the opening size prior to valve testing. The inspectors concluded this finding was of very low safety significance because it is a design deficiency confirmed not to result in the loss of operability or functionality. the loss of operability or functionality. +
23:59:59, 31 December 2010 +
23:59:59, 31 December 2010 +
10 +
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C Graves +, M Peck +, L Ricketson +, D Allen +, B Latta +, E Wong +, Clyde Osterholtz +, Isaac Anchondo +, Ron Kopriva +, Dustin Reinert +, Michael Brown +, Paul Goldberg + and Casey Alldredge +
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>.
15:41:10, 30 May 2018 +
C Graves +, M Peck +, L Ricketson +, D Allen +, B Latta +, E Wong +, Clyde Osterholtz +, Isaac Anchondo +, Ron Kopriva +, Dustin Reinert +, Michael Brown +, Paul Goldberg + and Casey Alldredge +
23:59:59, 31 December 2010 +