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ENS 40664
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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
San Onofre Unit 2 was manually tripped fro … San Onofre Unit 2 was manually tripped from 97% power due to the loss of feed water pumps. After both feedwater pumps tripped, the operators manually tripped the reactor. Both trains of the emergency feed water system actuated as expected due to the initial power level. The plant is stable at NOP/NOT. The cause of the feed water pump trips is being evaluated. All control rods fully inserted and all safety systems worked properly. The steam generators are discharging steam to the main condenser using the turbine bypass valves. AFW pumps are running to maintain steam generator water levels.</br>The Licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
18:50:00, 10 April 2004  +
ENS id number
40,664  +
Emergency class
Non Emergency +
Entered date
16:54:00, 10 April 2004  +
Event date
18:50:00, 10 April 2004  +
Event description
San Onofre Unit 2 was manually tripped fro … San Onofre Unit 2 was manually tripped from 97% power due to the loss of feed water pumps. After both feedwater pumps tripped, the operators manually tripped the reactor. Both trains of the emergency feed water system actuated as expected due to the initial power level. The plant is stable at NOP/NOT. The cause of the feed water pump trips is being evaluated. All control rods fully inserted and all safety systems worked properly. The steam generators are discharging steam to the main condenser using the turbine bypass valves. AFW pumps are running to maintain steam generator water levels.</br>The Licensee notified the NRC Resident Inspector.ensee 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 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +, ENS 40664 +  and ENS 40664 +
Initial power
97  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 10 April 2004  +
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>.
02:23:47, 2 March 2018  +
NRC officer
Bill Gott +
Notification date
16:54:00, 10 April 2004  +
Originated by
Joel Barnett +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
CE +
Region
NRC Region 4 +
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
-0.0804 d (-1.93 hours, -0.0115 weeks, -0.00264 months)  +
Scram
Manual Scram +
Site
San Onofre +
Start date
18:50:00, 10 April 2004  +
State
California +
System
Steam Generator +, Feedwater +, Main Condenser +  and Control Rod +
Title
Manual Reactor Trip Due to Loss of Both Main Feedwater Pumps  +
Turbine component
Turbine bypass valve +
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/2004/20040412en.html#en40664  +
Unit
2  +
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