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ENS 46653
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +  and 10 CFR 50.72#b3v +
Current power
100  +
Current reactor mode
Power Operation +
Description
While testing fire detection systems, a ra … While testing fire detection systems, a radio was keyed in the vicinity of the Auxiliary Shutdown Panel. Control Room alarms that occurred at the same time led to a review of plant data. This review revealed two momentary events (approximately 8 and 19 seconds) over an approximate two minute period that caused momentary reductions in the control signals to the Auxiliary Feedwater Pump and Motor-Driven Feedwater Pump discharge control valves. These momentary signal reductions resulted in all trains of Emergency Feedwater being inoperable for approximately two minutes, pending further evaluation.</br>With all trains of Emergency Feedwater inoperable, this event is being reported in accordance with 10 CFR 50.72(b)(3)(v) as a momentary loss of safety function for equipment needed to (A) shut down the reactor and maintain it in a safe shutdown condition and to (B) remove residual heat. </br>Fire detection testing has been completed, and a sign placed on the Auxiliary Shutdown Panel Room door stating that no radio usage is permitted inside the room.</br>All trains of Emergency Feedwater are now operable.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.  +
Discovered date
18:53:00, 3 March 2011  +
ENS id number
46,653  +
Emergency class
Non Emergency +
Entered date
20:11:00, 3 March 2011  +
Event date
18:53:00, 3 March 2011  +
Event description
While testing fire detection systems, a ra … While testing fire detection systems, a radio was keyed in the vicinity of the Auxiliary Shutdown Panel. Control Room alarms that occurred at the same time led to a review of plant data. This review revealed two momentary events (approximately 8 and 19 seconds) over an approximate two minute period that caused momentary reductions in the control signals to the Auxiliary Feedwater Pump and Motor-Driven Feedwater Pump discharge control valves. These momentary signal reductions resulted in all trains of Emergency Feedwater being inoperable for approximately two minutes, pending further evaluation.</br>With all trains of Emergency Feedwater inoperable, this event is being reported in accordance with 10 CFR 50.72(b)(3)(v) as a momentary loss of safety function for equipment needed to (A) shut down the reactor and maintain it in a safe shutdown condition and to (B) remove residual heat. </br>Fire detection testing has been completed, and a sign placed on the Auxiliary Shutdown Panel Room door stating that no radio usage is permitted inside the room.</br>All trains of Emergency Feedwater are now operable.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.  +
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ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +, ENS 46653 +  and ENS 46653 +
Initial power
100  +
Initial reactor mode
Power Operation +
LER
05000346/LER-2011-003, Regarding Radio Usage Renders Emergency Feedwater Inoperable +  and Regarding Radio Usage Renders Emergency Feedwater Inoperable +
Last update date
00:00:00, 3 March 2011  +
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>.
02:07:43, 2 March 2018  +
NRC officer
John Knoke +
Notification date
20:11:00, 3 March 2011  +
Originated by
Tom Cobbledick +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
B&W-R-LP +
Region
NRC Region 3 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +  and 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +
Reporting time
0.0542 d (1.3 hours, 0.00774 weeks, 0.00178 months)  +
Site
Davis Besse +
Start date
18:53:00, 3 March 2011  +
State
Ohio +
System
Feedwater +  and Auxiliary Feedwater +
Title
Temporary Loss of Emergency Feedwater Trains  +
Topic
Safe Shutdown +
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/2011/20110304en.html#en46653  +
Unit
1  +
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