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Valve BNHV8812A RWST to RHR Pump A Isolati … Valve BNHV8812A RWST to RHR Pump A Isolation is manually closed in OFN RP-017, Control Room Evacuation, in response to a control room fire. Simulated timing assumed approximately 1 minute to close the valve. Discussions with the MOV engineer revealed that the valve takes 600 turns to close. Operations Standing Order 1 limits the number of hand wheel turns to 60 per minute. At a closure rate of 60 turns per minute, it will take a minimum of 10 minutes to close the valve, rather than the assumed 1-minute. The additional 9 minutes necessary to close the valve will delay the completion of subsequent steps. Most significantly, the time to establish charging flow increases from 20 minutes to a minimum of 29 minutes. Thermal hydraulic analysis documented in SA-08-006 assumed the charging flow will be established within 28 minutes. Therefore the time to establish charging flow exceeds that assumed in the thermal hydraulic analysis by at least 1 minute. Compensatory actions have been put in place in order to accomplish this task within the time allowed by the thermal hydraulic analysis.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
20:00:00, 19 August 2009 +
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20:33:00, 19 August 2009 +
20:00:00, 19 August 2009 +
Valve BNHV8812A RWST to RHR Pump A Isolati … Valve BNHV8812A RWST to RHR Pump A Isolation is manually closed in OFN RP-017, Control Room Evacuation, in response to a control room fire. Simulated timing assumed approximately 1 minute to close the valve. Discussions with the MOV engineer revealed that the valve takes 600 turns to close. Operations Standing Order 1 limits the number of hand wheel turns to 60 per minute. At a closure rate of 60 turns per minute, it will take a minimum of 10 minutes to close the valve, rather than the assumed 1-minute. The additional 9 minutes necessary to close the valve will delay the completion of subsequent steps. Most significantly, the time to establish charging flow increases from 20 minutes to a minimum of 29 minutes. Thermal hydraulic analysis documented in SA-08-006 assumed the charging flow will be established within 28 minutes. Therefore the time to establish charging flow exceeds that assumed in the thermal hydraulic analysis by at least 1 minute. Compensatory actions have been put in place in order to accomplish this task within the time allowed by the thermal hydraulic analysis.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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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>.
02:11:29, 2 March 2018 +
20:33:00, 19 August 2009 +
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0.0229 d (0.55 hours, 0.00327 weeks, 7.5339e-4 months) +
20:00:00, 19 August 2009 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.