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ENS 46155
Show incoming properties
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
On August 5, 2010 at 1145 CDT, both doors … On August 5, 2010 at 1145 CDT, both doors in Airlock 413 from Secondary Containment (SCT) to the 985 ft Radwaste Pump Room were simultaneously open for a period of approximately five (5) seconds and subsequently reclosed. This condition caused an unplanned entry into Technical Specification 3.6.4.1.A for SCT. The condition could have prevented the Standby Gas Treatment system from developing a negative pressure with SCT following a design basis accident. This negative pressure is required to prevent ground level release of radioactivity and to minimize onsite and offsite dose consequences following an accident. The Standby Gas Treatment system remained operable throughout the event.</br>The licensee will inform the State and has notified the NRC Resident Inspector.d has notified the NRC Resident Inspector.  +
Discovered date
16:45:00, 5 August 2010  +
ENS id number
46,155  +
Emergency class
Non Emergency +
Entered date
15:30:00, 5 August 2010  +
Event date
16:45:00, 5 August 2010  +
Event description
On August 5, 2010 at 1145 CDT, both doors … On August 5, 2010 at 1145 CDT, both doors in Airlock 413 from Secondary Containment (SCT) to the 985 ft Radwaste Pump Room were simultaneously open for a period of approximately five (5) seconds and subsequently reclosed. This condition caused an unplanned entry into Technical Specification 3.6.4.1.A for SCT. The condition could have prevented the Standby Gas Treatment system from developing a negative pressure with SCT following a design basis accident. This negative pressure is required to prevent ground level release of radioactivity and to minimize onsite and offsite dose consequences following an accident. The Standby Gas Treatment system remained operable throughout the event.</br>The licensee will inform the State and has notified the NRC Resident Inspector.d has notified the NRC Resident Inspector.  +
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ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +, ENS 46155 +  and ENS 46155 +
Initial power
100  +
Initial reactor mode
Power Operation +
LER
05000397/LER-2012-007, For Columbia Generating Station Regarding Secondary Containment Inoperable Due to Both Airlock Doors Being Open +  and For Columbia Generating Station Regarding Secondary Containment Inoperable Due to Both Airlock Doors Being Open +
Last update date
00:00:00, 5 August 2010  +
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>.
02:09:03, 2 March 2018  +
NRC officer
Steve Sandin +
Notification date
15:30:00, 5 August 2010  +
Originated by
Randy Sand +
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
-0.0521 d (-1.25 hours, -0.00744 weeks, -0.00171 months)  +
Site
Monticello +
Start date
16:45:00, 5 August 2010  +
State
Minnesota +
System
Secondary containment +  and Standby Gas Treatment System +
TS
TS-3.6.4.1 +
Title
Momentary Loss of Secondary Containment Due to Personnel Passing Through Open Airlocks  +
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/2010/20100806en.html#en46155  +
Unit
1  +
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