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ENS 46937
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Category
ENS Notification  and Power Reactor
CFR
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)(v)(C), Loss of Safety Function - Release of Radioactive Material +
Current power
100  +
Current reactor mode
Power Operation +
Description
Secondary containment was declared inopera … Secondary containment was declared inoperable after transferring refuel floor supply fans. Secondary containment D/P (Differential Pressure) lowered to 0.17 inches of water vacuum which does not meet the surveillance requirement to have secondary containment vacuum greater than or equal to 0.25 inches of water vacuum. Refuel floor ventilation was restored back to the previous configuration and secondary containment D/P was restored back to greater than 0.25 inches of water vacuum. Vacuum was less than 0.25 inches of water for approximately 4 minutes.</br>There were no actual radiological releases associated with the event.</br>Actual secondary containment integrity was not challenged. The lowered secondary containment D/P was a result of a ventilation lineup change.</br>The licensee has notified the NRC Resident Inspector and the State of Minnesota.dent Inspector and the State of Minnesota.  +
Discovered date
13:00:00, 8 June 2011  +
ENS id number
46,937  +
Emergency class
Non Emergency +
Entered date
14:12:00, 8 June 2011  +
Event date
13:00:00, 8 June 2011  +
Event description
Secondary containment was declared inopera … Secondary containment was declared inoperable after transferring refuel floor supply fans. Secondary containment D/P (Differential Pressure) lowered to 0.17 inches of water vacuum which does not meet the surveillance requirement to have secondary containment vacuum greater than or equal to 0.25 inches of water vacuum. Refuel floor ventilation was restored back to the previous configuration and secondary containment D/P was restored back to greater than 0.25 inches of water vacuum. Vacuum was less than 0.25 inches of water for approximately 4 minutes.</br>There were no actual radiological releases associated with the event.</br>Actual secondary containment integrity was not challenged. The lowered secondary containment D/P was a result of a ventilation lineup change.</br>The licensee has notified the NRC Resident Inspector and the State of Minnesota.dent Inspector and the State of Minnesota.  +
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ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +, ENS 46937 +  and ENS 46937 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 8 June 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>.
02:06:56, 2 March 2018  +
NRC officer
Howie Crouch +
Notification date
14:12:00, 8 June 2011  +
Originated by
Brandon Diggs +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
GE-3 +
Region
NRC Region 3 +
Reporting criterion
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)(v)(C), Loss of Safety Function - Release of Radioactive Material +
Reporting time
0.05 d (1.2 hours, 0.00714 weeks, 0.00164 months)  +
Site
Monticello +
Start date
13:00:00, 8 June 2011  +
State
Minnesota +
System
Secondary containment +
Title
Secondary Containment Inoperable Due to Ventilation Alignment Issue  +
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/2011/20110609en.html#en46937  +
Unit
1  +
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