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While performing a startup of HNP-2, after … While performing a startup of HNP-2, after reaching criticality, the crew observed erratic indications on two Intermediate Range Monitors (IRMs), 2C51K601A and 2C51K601C. IRM 2C51K601A had been spiking and was subsequently bypassed. The 2C51K601C was spiking downscale and could not be bypassed due to the 2C51K601A being bypassed already. Both IRMs are in the 'A' RPS trip system. At the time when the second IRM was acting erratic, the crew identified the condition as both IRMs in the same quadrant and did not continue withdrawal of control rods. As a result of not withdrawing control rods, reactor power began to decrease and the crew conservatively inserted a manual reactor scram to shutdown the reactor. All rods did fully insert into the core. No PCIS (Primary Containment Isolation System) actuations occurred and none were expected to occur based on plant conditions following the scram.</br>At this time, investigation is in progress, but the investigation and corrective actions have not yet been completed.</br>The crew is maintaining HNP-2 in Hot Standby (Mode 3) at this time.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector. +
20:11:00, 24 October 2011 +
47,369 +
17:01:00, 24 October 2011 +
20:11:00, 24 October 2011 +
While performing a startup of HNP-2, after … While performing a startup of HNP-2, after reaching criticality, the crew observed erratic indications on two Intermediate Range Monitors (IRMs), 2C51K601A and 2C51K601C. IRM 2C51K601A had been spiking and was subsequently bypassed. The 2C51K601C was spiking downscale and could not be bypassed due to the 2C51K601A being bypassed already. Both IRMs are in the 'A' RPS trip system. At the time when the second IRM was acting erratic, the crew identified the condition as both IRMs in the same quadrant and did not continue withdrawal of control rods. As a result of not withdrawing control rods, reactor power began to decrease and the crew conservatively inserted a manual reactor scram to shutdown the reactor. All rods did fully insert into the core. No PCIS (Primary Containment Isolation System) actuations occurred and none were expected to occur based on plant conditions following the scram.</br>At this time, investigation is in progress, but the investigation and corrective actions have not yet been completed.</br>The crew is maintaining HNP-2 in Hot Standby (Mode 3) at this time.</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>.
00:00:00, 24 October 2011 +
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>.
02:05:41, 2 March 2018 +
17:01:00, 24 October 2011 +
true +
true +
-0.132 d (-3.17 hours, -0.0189 weeks, -0.00434 months) +
20:11:00, 24 October 2011 +
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.