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Following startup from refueling outage 1R … Following startup from refueling outage 1R21, Arkansas Nuclear One Unit 1 was holding stable at 32% reactor power in order to perform Nuclear Instrumentation (NI) calibration. Control Rod Drive Mechanism (CRDM) control was in automatic with the controlling group (Group 7) at approximately 75% withdrawn. Control room operators received an asymmetric rod alarm and noted abnormal rod pattern on Group 7 with reactor power lowering. At this point, operations manually scrammed the reactor. Post trip response was normal and the plant is stable in Mode 3. Reactor Coolant System pressure is approximately 2155 psig and temperature is approximately 550 degree F. Post Transient Review is in progress.</br>Unit 1 is in a normal post trip electrical lineup. No primary or secondary reliefs lifted during the transient. Auxiliary feedwater was placed in service to supply the Steam Generators for decay heat removal via the Main Condenser.</br>The licensee informed both the State and NRC Resident Inspector.both the State and NRC Resident Inspector. +
14:55:00, 12 December 2008 +
11:48:00, 12 December 2008 +
14:55:00, 12 December 2008 +
Following startup from refueling outage 1R … Following startup from refueling outage 1R21, Arkansas Nuclear One Unit 1 was holding stable at 32% reactor power in order to perform Nuclear Instrumentation (NI) calibration. Control Rod Drive Mechanism (CRDM) control was in automatic with the controlling group (Group 7) at approximately 75% withdrawn. Control room operators received an asymmetric rod alarm and noted abnormal rod pattern on Group 7 with reactor power lowering. At this point, operations manually scrammed the reactor. Post trip response was normal and the plant is stable in Mode 3. Reactor Coolant System pressure is approximately 2155 psig and temperature is approximately 550 degree F. Post Transient Review is in progress.</br>Unit 1 is in a normal post trip electrical lineup. No primary or secondary reliefs lifted during the transient. Auxiliary feedwater was placed in service to supply the Steam Generators for decay heat removal via the Main Condenser.</br>The licensee informed both the State and NRC Resident Inspector.both the State and NRC Resident Inspector. +
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00:00:00, 12 December 2008 +
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>.
02:13:02, 2 March 2018 +
11:48:00, 12 December 2008 +
true +
true +
-0.13 d (-3.12 hours, -0.0186 weeks, -0.00427 months) +
14:55:00, 12 December 2008 +
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