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ENS 43590
Show incoming properties
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(b)(3)(xiii), Loss of Emergency Preparedness +, 10 CFR 50.72#b2ivB +, 10 CFR 50.72#b3ivA +  and 10 CFR 50.72#b3xiii +
Current power
100  +  and 0  +
Current reactor mode
Hot Standby +  and Power Operation +
Description
At 1530 hours on 8/23/07, Braidwood Statio … At 1530 hours on 8/23/07, Braidwood Station Unit 2 was manually tripped due to lowering condenser vacuum. The lowering condenser vacuum resulted from the trip of two circulating water pumps. The cause of the two circulating water pump tripping is under investigation. All control rods inserted and there were no complications during the trip and all systems functions as required. Following the unit trip, the Auxiliary Feedwater System actuated as expected to maintain steam generator level. At the time of the unit trip, the Braidwood Station area was experiencing severe thunderstorms.</br>Additionally, at 1604 hours, 19 of 70 emergency sirens for the Braidwood Station were declared inoperable due to a loss of power from storms in the area. As of 1704 hours, 19 sirens (greater than 25%) remain inoperable. This event is considered a major loss of offsite response capability and applies to both Braidwood Station Unit 1 and Unit 2.</br>These events are is being reported under:</br>(1) 10 CFR 50.72(b)(2)(iv)(B) as an event that results in the actuation of the reactor protection system (RPS) when the reactor is critical,</br>(2) 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the PWR auxiliary feedwater system.</br>(3) 10 CFR 50.72(b)(3)(xiii) as a major loss of offsite response capability.</br>All safety buses remained powered by offsite power throughout this event. Emergency diesel generators are available if needed. No steam generator PORV's lifted as a result of the trip. Decay heat is being discharged to the condenser via the steam dumps.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector.  +
Discovered date
20:30:00, 23 August 2007  +
ENS id number
43,590  +
Emergency class
Non Emergency +
Entered date
20:14:00, 23 August 2007  +
Event date
20:30:00, 23 August 2007  +
Event description
At 1530 hours on 8/23/07, Braidwood Statio … At 1530 hours on 8/23/07, Braidwood Station Unit 2 was manually tripped due to lowering condenser vacuum. The lowering condenser vacuum resulted from the trip of two circulating water pumps. The cause of the two circulating water pump tripping is under investigation. All control rods inserted and there were no complications during the trip and all systems functions as required. Following the unit trip, the Auxiliary Feedwater System actuated as expected to maintain steam generator level. At the time of the unit trip, the Braidwood Station area was experiencing severe thunderstorms.</br>Additionally, at 1604 hours, 19 of 70 emergency sirens for the Braidwood Station were declared inoperable due to a loss of power from storms in the area. As of 1704 hours, 19 sirens (greater than 25%) remain inoperable. This event is considered a major loss of offsite response capability and applies to both Braidwood Station Unit 1 and Unit 2.</br>These events are is being reported under:</br>(1) 10 CFR 50.72(b)(2)(iv)(B) as an event that results in the actuation of the reactor protection system (RPS) when the reactor is critical,</br>(2) 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the PWR auxiliary feedwater system.</br>(3) 10 CFR 50.72(b)(3)(xiii) as a major loss of offsite response capability.</br>All safety buses remained powered by offsite power throughout this event. Emergency diesel generators are available if needed. No steam generator PORV's lifted as a result of the trip. Decay heat is being discharged to the condenser via the steam dumps.</br>The licensee informed the NRC Resident Inspector.ensee informed 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 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +, ENS 43590 +  and ENS 43590 +
Hours
0.0177 d (0.425 hours, 0.00253 weeks, 5.82165e-4 months)  +, 0.0186 d (0.446 hours, 0.00265 weeks, 6.10322e-4 months)  +  and 0.0197 d (0.473 hours, 0.00282 weeks, 6.48372e-4 months)  +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 23 August 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>.
02:16:07, 2 March 2018  +
NRC officer
Pete Snyder +
Notification date
20:14:00, 23 August 2007  +
Originated by
Ralph Richard +
Reactor critical
true  +
Reactor scram
false  +  and true  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 3 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +  and 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness +
Reporting time
-0.0113 d (-0.27 hours, -0.00161 weeks, -3.69846e-4 months)  +
Scram
Manual Scram +
Site
Braidwood +
Start date
20:30:00, 23 August 2007  +
State
Illinois +
System
Steam Generator +, Reactor Protection System +, Emergency Diesel Generator +, Auxiliary Feedwater +  and Control Rod +
Title
Manual Reactor Trip Because of Lowering Condenser Vacuum  +
Topic
Siren +
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/2007/20070824en.html#en43590  +
Unit
1  +  and 2  +
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