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ENS 45279
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +  and 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition +
Current power
100  +
Current reactor mode
Power Operation +
Description
At 08:38 on 08/20/09, a plant operator ide … At 08:38 on 08/20/09, a plant operator identified that DOOR-18, which is a normally open fire door, had closed due to a failed fusible link. With this door closed, the pathway for a potential flood due to a high energy line break (HELB) is blocked therefore closing off a drain path for the water. This represented an unanalyzed condition where both divisions of essential switchgear could be impacted. As a result, both divisions of essential switchgear were declared inoperable and Technical Specification LCO 3.0.3 was entered. </br>With both switchgear divisions being inoperable, this condition is also an event that could have prevented fulfillment of a Safely Function and reportable under 50.72(b)(3)(v). At 0942 on 08/20/09, the closed fire door was restored to the open state. Both divisions of switchgear were declared Operable and LCO 3.0.3 was exited. No system actuations occurred as a part of this event.</br>A continuous fire watch was posted as a compensatory measure while the fire door is being repaired.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
13:38:00, 20 August 2009  +
ENS id number
45,279  +
Emergency class
Non Emergency +
Entered date
15:19:00, 20 August 2009  +
Event date
13:38:00, 20 August 2009  +
Event description
At 08:38 on 08/20/09, a plant operator ide … At 08:38 on 08/20/09, a plant operator identified that DOOR-18, which is a normally open fire door, had closed due to a failed fusible link. With this door closed, the pathway for a potential flood due to a high energy line break (HELB) is blocked therefore closing off a drain path for the water. This represented an unanalyzed condition where both divisions of essential switchgear could be impacted. As a result, both divisions of essential switchgear were declared inoperable and Technical Specification LCO 3.0.3 was entered. </br>With both switchgear divisions being inoperable, this condition is also an event that could have prevented fulfillment of a Safely Function and reportable under 50.72(b)(3)(v). At 0942 on 08/20/09, the closed fire door was restored to the open state. Both divisions of switchgear were declared Operable and LCO 3.0.3 was exited. No system actuations occurred as a part of this event.</br>A continuous fire watch was posted as a compensatory measure while the fire door is being repaired.</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 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +, ENS 45279 +  and ENS 45279 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 20 August 2009  +
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>.
02:11:29, 2 March 2018  +
NRC officer
Pete Snyder +
Notification date
15:19:00, 20 August 2009  +
Originated by
Leroy Anderson +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
GE-3 +
Region
NRC Region 3 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +  and 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition +
Reporting time
0.07 d (1.68 hours, 0.01 weeks, 0.0023 months)  +
Site
Monticello +
Start date
13:38:00, 20 August 2009  +
State
Minnesota +
TS
TS-3.0.3 +
Title
Both Divisions of Vital Switchgear Inoperable Because Flood Door Found Closed  +
Topic
Unanalyzed Condition +, High Energy Line Break +  and Continuous fire watch +
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/2009/20090821en.html#en45279  +
Unit
1  +
 
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