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This is a 4-hr Non-Emergency notification … This is a 4-hr Non-Emergency notification to the NRCOC (Nuclear Regulatory Commission Operations Center) for an event that results in actuation of the Reactor Protection System (RPS) when the reactor is critical in accordance with 10CFR50.72(b)(2)(iv)(B).</br>On 3/6/11 at approx 16:20 (EST), Steam Generator sodium concentrations started to rise and exceeded 3-ONOP-071.1 (Secondary Chemistry Deviation from limits) Action Level 3 criteria (250 ppb Sodium). The plant power was reduced to 25% per 3-ONOP-100, Fast Load Reduction, and a manual plant trip (was) initiated per procedure at 16:44 (EST). Unit (3) is stabilized in Mode 3, and (the licensee) is performing secondary clean-up.</br> All rods fully inserted. All safety systems functioned as required. The reactor trip was uncomplicated. Unit 4 was unaffected by this event.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
21:44:00, 6 March 2011 +
19:38:00, 6 March 2011 +
21:44:00, 6 March 2011 +
This is a 4-hr Non-Emergency notification … This is a 4-hr Non-Emergency notification to the NRCOC (Nuclear Regulatory Commission Operations Center) for an event that results in actuation of the Reactor Protection System (RPS) when the reactor is critical in accordance with 10CFR50.72(b)(2)(iv)(B).</br>On 3/6/11 at approx 16:20 (EST), Steam Generator sodium concentrations started to rise and exceeded 3-ONOP-071.1 (Secondary Chemistry Deviation from limits) Action Level 3 criteria (250 ppb Sodium). The plant power was reduced to 25% per 3-ONOP-100, Fast Load Reduction, and a manual plant trip (was) initiated per procedure at 16:44 (EST). Unit (3) is stabilized in Mode 3, and (the licensee) is performing secondary clean-up.</br> All rods fully inserted. All safety systems functioned as required. The reactor trip was uncomplicated. Unit 4 was unaffected by this event.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 6 March 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>.
02:07:43, 2 March 2018 +
19:38:00, 6 March 2011 +
true +
true +
-0.0875 d (-2.1 hours, -0.0125 weeks, -0.00288 months) +
21:44:00, 6 March 2011 +
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