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On April 11, 2015 at 0051 EDT, Secondary C … On April 11, 2015 at 0051 EDT, Secondary Containment became inoperable requiring a Technical Specification 3.6.4.1 entry for failure to meet SR (Surveillance Requirement) 3.6.4.1.1 on Unit 1 and Unit 2, loss of required differential pressure.</br> </br>The inoperability was caused by a loss of normal Zone 2 differential pressure due to loss of running fans and failure to start of standby fans. The cause is being investigated.</br>Engineering and maintenance personnel implemented a Temporary Engineering Change, which allowed restoration of one set of fans and dampers. Normal secondary containment differential pressure was restored. Technical Specification 3.6.4.1 was exited at 0320 EDT.</br>This event is being reported under 10 CFR 50.72(b)(3)(v)(c) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment system.</br>The NRC Resident Inspector was notified.</br>Temporary Engineering Change consisted of removing air to a previously running fan discharge damper so it would close and allow standby fans to start.uld close and allow standby fans to start. +
04:51:00, 11 April 2015 +
50,974 +
05:22:00, 11 April 2015 +
04:51:00, 11 April 2015 +
On April 11, 2015 at 0051 EDT, Secondary C … On April 11, 2015 at 0051 EDT, Secondary Containment became inoperable requiring a Technical Specification 3.6.4.1 entry for failure to meet SR (Surveillance Requirement) 3.6.4.1.1 on Unit 1 and Unit 2, loss of required differential pressure.</br> </br>The inoperability was caused by a loss of normal Zone 2 differential pressure due to loss of running fans and failure to start of standby fans. The cause is being investigated.</br>Engineering and maintenance personnel implemented a Temporary Engineering Change, which allowed restoration of one set of fans and dampers. Normal secondary containment differential pressure was restored. Technical Specification 3.6.4.1 was exited at 0320 EDT.</br>This event is being reported under 10 CFR 50.72(b)(3)(v)(c) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment system.</br>The NRC Resident Inspector was notified.</br>Temporary Engineering Change consisted of removing air to a previously running fan discharge damper so it would close and allow standby fans to start.uld close and allow standby fans to start. +
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>.
00:00:00, 11 April 2015 +
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>.
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04:51:00, 11 April 2015 +
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.