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A self-revealing Green Finding was identif … A self-revealing Green Finding was identified for the incorrect operability determination of main control room isolation damper 1-VS-MOD-103D. The damper, declared operable and left in-service following loss of power to its hydraulic pump on September 21, 2009 (CR 349003), failed to close on demand, on September 22, 2009. The damper was inoperable for approximately 19 hours (CR 349075) before power was restored to the pump, the damper closed, and the actuator repaired. The finding, associated with the performance attribute of the barrier integrity cornerstone, is more than minor because it adversely affected the cornerstone objective as it relates to control room integrity, to provide reasonable assurance physical design barriers protect public health and safety. The finding, evaluated perMC-0609, Attachment 4, Phase 1 Initial Screening and Characterization of Findings, was determined to be of very low safety significance (Green) because it did not result in a loss of safety function or the loss of a singe train of the control room isolation boundary for more than its allowed outage time. This finding has a cross-cutting aspect in the area of problem identification, corrective action program, in that an adequate operability assessment that thoroughly evaluated the degraded condition of 1-VS-MOD-103D was not performed (P.1.c)of 1-VS-MOD-103D was not performed (P.1.c) +
23:59:59, 31 December 2009 +
23:59:59, 31 December 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>.
00:38:18, 21 February 2018 +
23:59:59, 31 December 2009 +
Failure to perform an adequate operability determination for main control room isolation damper 1-VS-MOD-103D +