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As part of a fire modeling analysis evalua … As part of a fire modeling analysis evaluating a missing fire barrier reported in ENS notification 50475 (a gap where the ventilation duct passes through the wall from the Bus 150/160 room to the Auxiliary Feedwater (AFW) pump room), an additional missing fire barrier was identified. The barrier is related to separation of redundant pressurizer heater banks credited for safe shutdown. For Fire Area 32 (AFW pump room), Group E Pressurizer Heaters are credited for safe shutdown because Group A and Group B Pressurizer Heater cables could be affected by a fire in this area. It was determined that a cable associated with the Group C, D, and E Pressurizer Heaters is routed in Fire Area 32. Therefore, a fire in Fire Area 32 could affect all five Pressurizer Heater Groups. An evaluation has previously demonstrated that Mode 3 Hot Standby could be maintained with no charging pumps or pressurizer heaters available, but it has not been determined if Mode 5 could be achieved. Therefore, this missing fire barrier meets the reporting criteria for 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition that significantly degrades plant safety.</br>The protection of the health and safety of the public was not affected by this issue. Unit 1 is in mode 6 and no fire has occurred. Compensatory measures (fire watches) are in place for Fire Area 32.</br>The licensee has notified the NRC Senior Resident Inspector.</br>Unit 2 has a different cable routing and is not affected.fferent cable routing and is not affected. +
19:25:00, 13 October 2014 +
50,531 +
20:48:00, 13 October 2014 +
19:25:00, 13 October 2014 +
As part of a fire modeling analysis evalua … As part of a fire modeling analysis evaluating a missing fire barrier reported in ENS notification 50475 (a gap where the ventilation duct passes through the wall from the Bus 150/160 room to the Auxiliary Feedwater (AFW) pump room), an additional missing fire barrier was identified. The barrier is related to separation of redundant pressurizer heater banks credited for safe shutdown. For Fire Area 32 (AFW pump room), Group E Pressurizer Heaters are credited for safe shutdown because Group A and Group B Pressurizer Heater cables could be affected by a fire in this area. It was determined that a cable associated with the Group C, D, and E Pressurizer Heaters is routed in Fire Area 32. Therefore, a fire in Fire Area 32 could affect all five Pressurizer Heater Groups. An evaluation has previously demonstrated that Mode 3 Hot Standby could be maintained with no charging pumps or pressurizer heaters available, but it has not been determined if Mode 5 could be achieved. Therefore, this missing fire barrier meets the reporting criteria for 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition that significantly degrades plant safety.</br>The protection of the health and safety of the public was not affected by this issue. Unit 1 is in mode 6 and no fire has occurred. Compensatory measures (fire watches) are in place for Fire Area 32.</br>The licensee has notified the NRC Senior Resident Inspector.</br>Unit 2 has a different cable routing and is not affected.fferent cable routing and is not affected. +
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, 13 October 2014 +
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>.
01:49:27, 2 March 2018 +
20:48:00, 13 October 2014 +
false +
false +
0.0575 d (1.38 hours, 0.00821 weeks, 0.00189 months) +
19:25:00, 13 October 2014 +
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.