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This 60-day telephone notification is bein … This 60-day telephone notification is being made under the reporting requirements specified by 10 CFR 50.13(a)(2)(iv) and 10 CFR 50.73(a)(I) to describe an invalid RPS (Scram) actuation.</br>On May 1, 2011, at 0244 hours Central Daylight Time (CDT), during a non-refueling outage, Browns Ferry Unit 2 was at 000 percent power in Mode 4 with all control rods already inserted into the core when an invalid full scram signal was received.</br>The reactor scram signal was determined to be the result of a failure of the Unit 2 Unit Preferred Motor-Motor-Generator Set, which caused an electrical transient and resulted in noise In adjacent nuclear instrumentation cables.</br>The scram signal was Initiated due to Invalid Indications (spikes) associated with the C and D Intermediate Range Monitors (IRMs). The spikes did not render the IRMs inoperable as these were momentary spikes. Therefore, the actuation was invalid.</br>The scram was reset at 0312 CDT.</br>This event was entered In the Corrective Action Program as Service Request (SR) 362127, which generated Problem Evaluation Report (PER) 362897.</br>There were no safety consequences or impact on the health and safety of the public as a result of these events.</br>The NRC Resident Inspector has been notified of this event.Inspector has been notified of this event. +
07:44:00, 1 May 2011 +
47,003 +
21:03:00, 30 June 2011 +
07:44:00, 1 May 2011 +
This 60-day telephone notification is bein … This 60-day telephone notification is being made under the reporting requirements specified by 10 CFR 50.13(a)(2)(iv) and 10 CFR 50.73(a)(I) to describe an invalid RPS (Scram) actuation.</br>On May 1, 2011, at 0244 hours Central Daylight Time (CDT), during a non-refueling outage, Browns Ferry Unit 2 was at 000 percent power in Mode 4 with all control rods already inserted into the core when an invalid full scram signal was received.</br>The reactor scram signal was determined to be the result of a failure of the Unit 2 Unit Preferred Motor-Motor-Generator Set, which caused an electrical transient and resulted in noise In adjacent nuclear instrumentation cables.</br>The scram signal was Initiated due to Invalid Indications (spikes) associated with the C and D Intermediate Range Monitors (IRMs). The spikes did not render the IRMs inoperable as these were momentary spikes. Therefore, the actuation was invalid.</br>The scram was reset at 0312 CDT.</br>This event was entered In the Corrective Action Program as Service Request (SR) 362127, which generated Problem Evaluation Report (PER) 362897.</br>There were no safety consequences or impact on the health and safety of the public as a result of these events.</br>The NRC Resident Inspector has been notified of this event.Inspector has been notified of this event. +
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, 30 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>.
22:27:40, 24 September 2017 +
21:03:00, 30 June 2011 +
false +
false +
60.555 d (1,453.32 hours, 8.651 weeks, 1.991 months) +
07:44:00, 1 May 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.