Browse wiki
Jump to navigation
Jump to search
On January 4, 2013, at 0941 hours (CST), U … On January 4, 2013, at 0941 hours (CST), Unit 2 was manually tripped after 2 shutdown rods unexpectedly dropped during monthly control rod surveillance testing. Shutdown Bank C rods were being inserted in accordance with the surveillance procedure, when 2 rods in Shutdown Bank E (D-8 and M-8) unexpectedly dropped. This met the criteria for a manual reactor trip, which was immediately performed.</br>The appropriate procedures were entered to mitigate the transient and all systems responded as designed. </br>Unit 2 is currently in Mode 3 and the cause of the 2 dropped rods is under investigation.</br>All three (3) motor-driven and the steam-driven Auxiliary Feedwater Pumps started as required and have since been secured. Decay heat is being removed using normal startup feedwater with steam discharge to the main condenser via the bypass valves. Unit 2 is in a normal post trip electrical lineup.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector. +
15:41:00, 4 January 2013 +
48,651 +
14:19:00, 4 January 2013 +
15:41:00, 4 January 2013 +
On January 4, 2013, at 0941 hours (CST), U … On January 4, 2013, at 0941 hours (CST), Unit 2 was manually tripped after 2 shutdown rods unexpectedly dropped during monthly control rod surveillance testing. Shutdown Bank C rods were being inserted in accordance with the surveillance procedure, when 2 rods in Shutdown Bank E (D-8 and M-8) unexpectedly dropped. This met the criteria for a manual reactor trip, which was immediately performed.</br>The appropriate procedures were entered to mitigate the transient and all systems responded as designed. </br>Unit 2 is currently in Mode 3 and the cause of the 2 dropped rods is under investigation.</br>All three (3) motor-driven and the steam-driven Auxiliary Feedwater Pumps started as required and have since been secured. Decay heat is being removed using normal startup feedwater with steam discharge to the main condenser via the bypass valves. Unit 2 is in a normal post trip electrical lineup.</br>The licensee informed the NRC Resident Inspector.ensee informed 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, 4 January 2013 +
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>.
22:23:27, 24 September 2017 +
14:19:00, 4 January 2013 +
true +
true +
-0.0571 d (-1.37 hours, -0.00815 weeks, -0.00188 months) +
15:41:00, 4 January 2013 +
Unit 2 Manually Tripped After Two Shutdown Control Rods Unexpectedly Dropped During Surveillance Testing +
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.