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Event: During startup of Unit 1 on June 1 … Event: During startup of Unit 1 on June 10, 2011, after increasing power to approximately 50 percent, it was noticed that power range nuclear instrumentation was not responding adequately to power imbalance differences. At 0802 EDT, all four channels of Reactor Protective System instrumentation were declared inoperable. TS 3.3.1., Reactor Protective System (RPS) instrumentation, Condition A, B, and C were entered. RPS Channel D was placed in trip per Condition A. Trouble shooting efforts were immediately initiated.</br>Initial Safety Significance: This issue constitutes a loss of safety function because the nuclear overpower flux/flow imbalance trip function of RPS was not operable.</br>Corrective Action(s): Trouble-shooting commenced. A wiring error was identified that affected all four RPS channels. At this time, all four channels have been restored to operability. All conditions of TS 3.3.1, Conditions A, B, and C have been exited as of 1438 EDT hours when all four channels of RPS were restored.</br>The licensee stated that the wiring error is associated with a modification package that was completed during the recent refueling outage.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
12:02:00, 10 June 2011 +
46,947 +
15:55:00, 10 June 2011 +
12:02:00, 10 June 2011 +
Event: During startup of Unit 1 on June 1 … Event: During startup of Unit 1 on June 10, 2011, after increasing power to approximately 50 percent, it was noticed that power range nuclear instrumentation was not responding adequately to power imbalance differences. At 0802 EDT, all four channels of Reactor Protective System instrumentation were declared inoperable. TS 3.3.1., Reactor Protective System (RPS) instrumentation, Condition A, B, and C were entered. RPS Channel D was placed in trip per Condition A. Trouble shooting efforts were immediately initiated.</br>Initial Safety Significance: This issue constitutes a loss of safety function because the nuclear overpower flux/flow imbalance trip function of RPS was not operable.</br>Corrective Action(s): Trouble-shooting commenced. A wiring error was identified that affected all four RPS channels. At this time, all four channels have been restored to operability. All conditions of TS 3.3.1, Conditions A, B, and C have been exited as of 1438 EDT hours when all four channels of RPS were restored.</br>The licensee stated that the wiring error is associated with a modification package that was completed during the recent refueling outage.</br>The licensee has notified the NRC Resident Inspector.e has notified 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>.
50 +
00:00:00, 10 June 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>.
02:06:54, 2 March 2018 +
15:55:00, 10 June 2011 +
true +
false +
0.162 d (3.88 hours, 0.0231 weeks, 0.00531 months) +
12:02:00, 10 June 2011 +
All Four Channels of Rps Overpower Flux/Flow Imbalance Protection Trip Discovered to Be Inoperable +
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.