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ENS 48198
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Current power
0  +
Current reactor mode
Hot Standby +
Description
At 1926 EDT on 8/16/2012, Unit 2 reactor a … At 1926 EDT on 8/16/2012, Unit 2 reactor automatically tripped on single loop loss of flow, following #4 RCP trip. Cause of RCP trip is under investigation.</br>Following the reactor trip, all safety related equipment operated as designed. Auxiliary feedwater actuated as expected on loss of the operating main feedwater pumps.</br>Unit 2 is currently being maintained in Mode 3 at NOP/NOT (normal operating pressure/normal operating temperature), with auxiliary feedwater supplying the steam generator.</br>Method of decay heat removal is via steam dumps to condenser. Current RCS conditions: Temp = 547 degrees F and stable, Pressure = 2235 psig and stable. No indication of any primary/secondary leakage. All rods are inserted. Electrical alignment is normal, supplied from offsite power. No impact to Unit 1: Unit 1 is operating at 100% power / Mode 1.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
23:26:00, 16 August 2012  +
ENS id number
48,198  +
Emergency class
Non Emergency +
Entered date
22:09:00, 16 August 2012  +
Equipment trip
Reactor Trip +
Event date
23:26:00, 16 August 2012  +
Event description
At 1926 EDT on 8/16/2012, Unit 2 reactor a … At 1926 EDT on 8/16/2012, Unit 2 reactor automatically tripped on single loop loss of flow, following #4 RCP trip. Cause of RCP trip is under investigation.</br>Following the reactor trip, all safety related equipment operated as designed. Auxiliary feedwater actuated as expected on loss of the operating main feedwater pumps.</br>Unit 2 is currently being maintained in Mode 3 at NOP/NOT (normal operating pressure/normal operating temperature), with auxiliary feedwater supplying the steam generator.</br>Method of decay heat removal is via steam dumps to condenser. Current RCS conditions: Temp = 547 degrees F and stable, Pressure = 2235 psig and stable. No indication of any primary/secondary leakage. All rods are inserted. Electrical alignment is normal, supplied from offsite power. No impact to Unit 1: Unit 1 is operating at 100% power / Mode 1.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +, ENS 48198 +  and ENS 48198 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 16 August 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>.
02:03:23, 2 March 2018  +
NRC officer
Mark Abramovitz +
Notification date
22:09:00, 16 August 2012  +
Originated by
Tracy Sudoko +
Reactor critical
true  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 2 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Reporting time
-0.0533 d (-1.28 hours, -0.00762 weeks, -0.00175 months)  +
Site
Sequoyah +
Start date
23:26:00, 16 August 2012  +
State
Tennessee +
System
Steam Generator +, Feedwater +, Auxiliary Feedwater +  and Decay Heat Removal +
Title
Reactor Trip from a Reactor Coolant Pump Trip  +
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/2012/20120817en.html#en48198  +
Unit
2  +
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