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ENS 43346
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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 +  and 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge +
Current power
0  +
Current reactor mode
Hot Shutdown +
Description
The condensate prefilters isolated earlier … The condensate prefilters isolated earlier in the day and the bypass valve automatically opened. The computer controlling these valves was in the process of being replaced when the bypass valve shut. </br>Unit experienced a loss of feedwater due to condensate pre-filter valves going closed. The reactor was manually scrammed and HPCI was used to restore reactor water level. MSIVs closed and the U2 and U2/3 EDGs auto started on low level.</br>All rods fully inserted on the manual scram. Minimum level was approximately -54 inches. Decay heat is being removed using the isolation condenser and level is being maintained with Control Rod Drive leak by. No safety or relief valves lifted during this event. The plant is in the normal shutdown electrical lineup.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
04:05:00, 5 May 2007  +
ENS id number
43,346  +
Emergency class
Non Emergency +
Entered date
02:13:00, 5 May 2007  +
Event date
04:05:00, 5 May 2007  +
Event description
The condensate prefilters isolated earlier … The condensate prefilters isolated earlier in the day and the bypass valve automatically opened. The computer controlling these valves was in the process of being replaced when the bypass valve shut. </br>Unit experienced a loss of feedwater due to condensate pre-filter valves going closed. The reactor was manually scrammed and HPCI was used to restore reactor water level. MSIVs closed and the U2 and U2/3 EDGs auto started on low level.</br>All rods fully inserted on the manual scram. Minimum level was approximately -54 inches. Decay heat is being removed using the isolation condenser and level is being maintained with Control Rod Drive leak by. No safety or relief valves lifted during this event. The plant is in the normal shutdown electrical lineup.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +, ENS 43346 +  and ENS 43346 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 5 May 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>.
02:16:46, 2 March 2018  +
NRC officer
Mark Abramovitz +
Notification date
02:13:00, 5 May 2007  +
Originated by
Chris Kent +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
GE-3 +
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)(2)(iv)(A), System Actuation - ECCS Discharge +
Reporting time
-0.0779 d (-1.87 hours, -0.0111 weeks, -0.00256 months)  +
Scram
Manual Scram +
Site
Dresden +
Start date
04:05:00, 5 May 2007  +
State
Illinois +
System
Feedwater +  and Control Rod +
Title
Manual Reactor Scram on Loss of Feedwater  +
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/2007/20070507en.html#en43346  +
Unit
2  +
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