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ENS 48549
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Current power
14  +
Current reactor mode
Power Operation +
Description
The Anticipated Transient Without Scram Mi … The Anticipated Transient Without Scram Mitigation System Actuation Circuitry (AMSAC) caused a Unit 2 turbine trip with reactor power at 31%. The 2A and 2B Auxiliary Feedwater pumps automatically started. The 2B Nuclear Service Water pump started as a result of 2B Auxiliary Feedwater pump automatically starting. The Main Feedwater Regulating valves and the Main Feedwater Bypass valves were in the correct position for corresponding power level and turbine inlet pressure, but AMSAC actuated earlier than design (290 psig vs. 360 psig).</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.  +
Discovered date
04:17:00, 2 December 2012  +
ENS id number
48,549  +
Emergency class
Non Emergency +
Entered date
03:05:00, 2 December 2012  +
Equipment trip
Turbine Trip +
Event date
04:17:00, 2 December 2012  +
Event description
The Anticipated Transient Without Scram Mi … The Anticipated Transient Without Scram Mitigation System Actuation Circuitry (AMSAC) caused a Unit 2 turbine trip with reactor power at 31%. The 2A and 2B Auxiliary Feedwater pumps automatically started. The 2B Nuclear Service Water pump started as a result of 2B Auxiliary Feedwater pump automatically starting. The Main Feedwater Regulating valves and the Main Feedwater Bypass valves were in the correct position for corresponding power level and turbine inlet pressure, but AMSAC actuated earlier than design (290 psig vs. 360 psig).</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>.
ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +, ENS 48549 +  and ENS 48549 +
Initial power
31  +
Initial reactor mode
Power Operation +
LER
05000370/LER-2012-002, Regarding Automatic Actuation of the Auxiliary Feedwater and Nuclear Service Water Systems +  and Regarding Automatic Actuation of the Auxiliary Feedwater and Nuclear Service Water Systems +
Last update date
00:00:00, 2 December 2012  +
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>.
02:02:21, 2 March 2018  +
NRC officer
John Knoke +
Notification date
03:05:00, 2 December 2012  +
Originated by
Eric Wilkinson +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 2 +
Reporting criterion
10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Reporting time
-0.05 d (-1.2 hours, -0.00714 weeks, -0.00164 months)  +
Site
McGuire +
Start date
04:17:00, 2 December 2012  +
State
North Carolina +
System
Feedwater +, Service water +  and Auxiliary Feedwater +
Title
Amsac Actuated at Lower than Expected Turbine Inlet Pressure  +
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.
http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20121203en.html#en48549  +
Unit
2  +
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