Browse wiki
Jump to navigation
Jump to search
On October 31, 2001, at approximately 1409 … On October 31, 2001, at approximately 1409, Unit 2 Reactor was manually tripped from 100% power when 2A/2B Condenser differential pressure reached 2.5 inches Hg.</br></br>A steam leak on the body of 21 air ejector main steam supply control valve had been identified on October 24, 2001. Plans were made to temporarily repair the steam leak by installing an enclosure box around the valve and its proximate piping and injecting leak sealant. As part of this planning a contingency action plan was developed to isolate the leak if further degradation of the valve occurred.</br></br>On October 31, 2001, temporary repairs to stop the leak were started by installing an enclosure box and injecting leak sealant. While preparing to inject the last stick of sealant, the enclosure box unexpectedly shifted. Due to a concern that the valve may have degraded further, with a potential for a steam release, the Shift Supervisor made a conservative decision and ordered an immediate evacuation of the Unit 2 Turbine Building.</br></br>While performing the steps of the contingency action plan to isolate and bypass the control valve, vacuum was lost faster in 2A condenser than in 2B condenser. When the vacuum differential pressure between the condensers reached 2.5 inches Hg the reactor/turbine was manually tripped as required by procedure. The post-trip recovery was normal.cedure. The post-trip recovery was normal. +
On October 31, 2001, at approximately 1409 … On October 31, 2001, at approximately 1409, Unit 2 Reactor was manually tripped from 100% power when 2A/2B Condenser differential pressure reached 2.5 inches Hg.</br></br>A steam leak on the body of 21 air ejector main steam supply control valve had been identified on October 24, 2001. Plans were made to temporarily repair the steam leak by installing an enclosure box around the valve and its proximate piping and injecting leak sealant. As part of this planning a contingency action plan was developed to isolate the leak if further degradation of the valve occurred.</br></br>On October 31, 2001, temporary repairs to stop the leak were started by installing an enclosure box and injecting leak sealant. While preparing to inject the last stick of sealant, the enclosure box unexpectedly shifted. Due to a concern that the valve may have degraded further, with a potential for a steam release, the Shift Supervisor made a conservative decision and ordered an immediate evacuation of the Unit 2 Turbine Building.</br></br>While performing the steps of the contingency action plan to isolate and bypass the control valve, vacuum was lost faster in 2A condenser than in 2B condenser. When the vacuum differential pressure between the condensers reached 2.5 inches Hg the reactor/turbine was manually tripped as required by procedure. The post-trip recovery was normal.cedure. The post-trip recovery was normal. +
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>.
5 +
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>.
05:28:54, 1 December 2017 +
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.