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10 CFR 50.65(a)(4), Requirements for Monit … 10 CFR 50.65(a)(4), Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, requires in part, that prior to performing maintenance activities, the licensee shall assess and manage the increase in risk that may result from the proposed maintenance activities. Nuclear System Directive (NSD) 415, Operational Risk Management (Modes 1-3) per 10 CFR 50.65(a)(4), implements the requirements set forth in 10 CFR 50.65(a)(4) during power operation. Contrary to the above, on November 30, 2009, with Unit 1 in Mode 3, the licensee failed to assess emergent work and allowed the Unit 1 Power Operated Relief Valve and Pressurizer Spray Valve to be concurrently out of service. This configuration resulted in the licensee entering an unplanned Red ORAM-Sentinel condition. The safety significance of this violation was assessed using IMC 0609, Appendix K and determined to be of very low safety significance (Green) based on the calculated incremental core damage probability increase for the exposure period of approximately 11 hours being 1.8E-7. The licensee entered the finding into their CAP as PIP O-09-8959.e finding into their CAP as PIP O-09-8959. +
23:59:59, 31 March 2010 +
23:59:59, 31 March 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>.
15:39:38, 30 May 2018 +
23:59:59, 31 March 2010 +