Browse wiki
Jump to navigation
Jump to search
100 +
On August. 24, 2007, Prairie Island staff … On August. 24, 2007, Prairie Island staff completed a past operability evaluation of a condition involving a missing fire barrier, such that the required degree of separation for redundant safe shutdown trains was lacking. The floor trench which transverses the auxiliary feedwater pump (AFWP) rooms has a 12 inch thick concrete barrier at the interface of Fire Areas 31 and 32 (Unit 1 and Unit 2 AFWP rooms). That barrier is required by NRC commitment to prevent the flow of flammable liquid (i.e., oil) and fire suppression water from transferring fire from one AFWP room to the other. That barrier contains penetrations which shall be controlled like any other fire barrier penetration.</br>One of those penetrations is a 4 inch pipe sleeve. When stuffed with fire-retardant wool and capped with provided threaded caps, it is a qualified seal. However, for approximately ten years, the 4 inch sleeve has contained a 3 inch hose. During most of this 10 year period there were hourly fire watches in these two fire areas, which were an acceptable compensatory measure. However; for a period between Sept. 19, 2005 and April 9, 2006 there were no hourly fire watches in place. Prairie Island staff concluded the required degree of separation was lacking with no compensatory measures, thus the as-found condition is reportable per 10 CFR 50.72(b)(3)(ii) as an unanalyzed condition that significantly degraded plant safety.</br>This condition was discovered and corrected on 8/10/07.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
16:30:00, 24 August 2007 +
43,592 +
13:41:00, 24 August 2007 +
16:30:00, 24 August 2007 +
On August. 24, 2007, Prairie Island staff … On August. 24, 2007, Prairie Island staff completed a past operability evaluation of a condition involving a missing fire barrier, such that the required degree of separation for redundant safe shutdown trains was lacking. The floor trench which transverses the auxiliary feedwater pump (AFWP) rooms has a 12 inch thick concrete barrier at the interface of Fire Areas 31 and 32 (Unit 1 and Unit 2 AFWP rooms). That barrier is required by NRC commitment to prevent the flow of flammable liquid (i.e., oil) and fire suppression water from transferring fire from one AFWP room to the other. That barrier contains penetrations which shall be controlled like any other fire barrier penetration.</br>One of those penetrations is a 4 inch pipe sleeve. When stuffed with fire-retardant wool and capped with provided threaded caps, it is a qualified seal. However, for approximately ten years, the 4 inch sleeve has contained a 3 inch hose. During most of this 10 year period there were hourly fire watches in these two fire areas, which were an acceptable compensatory measure. However; for a period between Sept. 19, 2005 and April 9, 2006 there were no hourly fire watches in place. Prairie Island staff concluded the required degree of separation was lacking with no compensatory measures, thus the as-found condition is reportable per 10 CFR 50.72(b)(3)(ii) as an unanalyzed condition that significantly degraded plant safety.</br>This condition was discovered and corrected on 8/10/07.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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>.
100 +
00:00:00, 24 August 2007 +
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>.
02:16:05, 2 March 2018 +
13:41:00, 24 August 2007 +
true +
false +
-0.118 d (-2.82 hours, -0.0168 weeks, -0.00386 months) +
16:30:00, 24 August 2007 +
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.