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ENS 43866
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +, 10 CFR 50.72#b2ivB +  and 10 CFR 50.72#b3ivA +
Current power
0  +
Current reactor mode
Hot Standby +
Description
On 12/25/07 at 2110 hours EST, Unit 2 trip … On 12/25/07 at 2110 hours EST, Unit 2 tripped from 100% power due to a trip of the 'B' Reactor Coolant Pump. The reactor trip 1st out annunciator was 'Loss of flow, power >30%'. All control rods fully inserted. This event is reportable per 10 CFR 50.72(b)(2)(iv)(B). The Auxiliary Feedwater (AFW) pumps auto started due to the event and the steam driven AFW pump subsequently tripped on overspeed. The steam driven AFW pump was reset and placed in service. The ESF (Engineered Safety Function) actuation is reportable per 10 CFR 50.72(b)(3)(iv)(A). The unit is currently in mode 3 and (the licensee is) investigating the cause of the ground on the 'B' reactor coolant pump.</br>The plant is at normal operating pressure and temperature. The electrical grid is stable and supplying plant loads through the startup transformer. Decay heat is being removed via the steam dumps to the condenser with feedwater being supplied via the normal path. </br>The licensee has notified the NRC Resident Inspector.nsee has notified the NRC Resident Inspector.  +
Discovered date
02:10:00, 26 December 2007  +
ENS id number
43,866  +
Emergency class
Non Emergency +
Entered date
23:22:00, 25 December 2007  +
Equipment trip
Reactor Trip +
Event date
02:10:00, 26 December 2007  +
Event description
On 12/25/07 at 2110 hours EST, Unit 2 trip … On 12/25/07 at 2110 hours EST, Unit 2 tripped from 100% power due to a trip of the 'B' Reactor Coolant Pump. The reactor trip 1st out annunciator was 'Loss of flow, power >30%'. All control rods fully inserted. This event is reportable per 10 CFR 50.72(b)(2)(iv)(B). The Auxiliary Feedwater (AFW) pumps auto started due to the event and the steam driven AFW pump subsequently tripped on overspeed. The steam driven AFW pump was reset and placed in service. The ESF (Engineered Safety Function) actuation is reportable per 10 CFR 50.72(b)(3)(iv)(A). The unit is currently in mode 3 and (the licensee is) investigating the cause of the ground on the 'B' reactor coolant pump.</br>The plant is at normal operating pressure and temperature. The electrical grid is stable and supplying plant loads through the startup transformer. Decay heat is being removed via the steam dumps to the condenser with feedwater being supplied via the normal path. </br>The licensee has notified the NRC Resident Inspector.nsee has notified the NRC Resident Inspector.  +
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ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +, ENS 43866 +  and ENS 43866 +
Hours
0.0244 d (0.586 hours, 0.00349 weeks, 8.02855e-4 months)  +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 25 December 2007  +
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>.
02:15:22, 2 March 2018  +
NRC officer
Howie Crouch +
Notification date
23:22:00, 25 December 2007  +
Originated by
Page Kemp +
Reactor critical
true  +
Reactor type
Westinghouse PWR 3-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
-0.117 d (-2.8 hours, -0.0167 weeks, -0.00384 months)  +
Scram
Automatic Scram +
Site
North Anna +
Start date
02:10:00, 26 December 2007  +
State
Virginia +
System
Feedwater +, Auxiliary Feedwater +  and Control Rod +
Title
Automatic Reactor Trip Due to Trip of "B" Reactor Coolant Pump  +
Topic
Overspeed +
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/2007/20071226en.html#en43866  +
Unit
2  +
 
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