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Title 10 CFR Part 50, Appendix B, Criterio … Title 10 CFR Part 50, Appendix B, Criterion III, Design Control, requires, in part, that measures shall be established for the selection and review for suitability of application of materials, parts, equipment, and processes that are essential to the SR function of structures, systems, and components. Contrary to this, in 1985, the licensee installed solenoid operated valves into an application that did not meet the minimum flow and/or differential pressure requirements needed to ensure the technical specification timing requirements for valve closure were met. Specifically, the licensee replaced RC-422 and RC-423, the inside and outside CIVs in the RCS Hot Leg Primary Sample Line, with new valves that were not appropriate for the flowrates and differential pressure experienced in the sample line. In early 2011, the licensee had ongoing timing problems with both valves and after multiple troubleshooting attempts, which included vendor interface, identified the design control error. The inspectors answered No to the MS Cornerstone questions and screened the finding as having very low safety significance (Green) in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Phase 1 Initial Screening and Characterization of Findings, Table 4a, dated January 10, 2008. The licensee documented this violation in their CAP as CRs 430865 and 432199. The licensee performed an apparent cause evaluation, which concluded that the design error was the cause of the slow to close valves. The licensees planned corrective actions included replacing the valves with a design appropriate for the application. a design appropriate for the application. +
23:59:59, 31 December 2011 +
23:59:59, 31 December 2011 +
10 +
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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>.
15:43:42, 30 May 2018 +
23:59:59, 31 December 2011 +