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ENS 46394
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
78  +
Current reactor mode
Power Operation +
Description
On November 4, 2010, at 11:28 AM both door … On November 4, 2010, at 11:28 AM both doors in airlock 124 from secondary containment to access control were simultaneously open for a period <5 seconds. The doors were immediately closed. This condition resulted in an unplanned entry into Technical Specification 3.6.4.1.A for secondary containment. The condition could have prevented the Standby Gas Treatment System from developing a negative pressure within secondary containment following a design basis accident. This negative pressure is required to prevent ground consequences following an accident. The Standby Gas Treatment System remained operable throughout the event.</br>The licensee was decreasing power at the time of the report for a condition unrelated to the report.</br>The licensee will notify the Minnesota Duty Officer.</br>The licensee notified the NRC Resident Inspector.licensee notified the NRC Resident Inspector.  +
Discovered date
05:00:00, 4 November 2010  +
ENS id number
46,394  +
Emergency class
Non Emergency +
Entered date
17:22:00, 4 November 2010  +
Event date
05:00:00, 4 November 2010  +
Event description
On November 4, 2010, at 11:28 AM both door … On November 4, 2010, at 11:28 AM both doors in airlock 124 from secondary containment to access control were simultaneously open for a period <5 seconds. The doors were immediately closed. This condition resulted in an unplanned entry into Technical Specification 3.6.4.1.A for secondary containment. The condition could have prevented the Standby Gas Treatment System from developing a negative pressure within secondary containment following a design basis accident. This negative pressure is required to prevent ground consequences following an accident. The Standby Gas Treatment System remained operable throughout the event.</br>The licensee was decreasing power at the time of the report for a condition unrelated to the report.</br>The licensee will notify the Minnesota Duty Officer.</br>The licensee notified the NRC Resident Inspector.licensee notified the NRC Resident Inspector.  +
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ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +, ENS 46394 +  and ENS 46394 +
Initial power
93  +
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, 4 November 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>.
22:29:13, 24 September 2017  +
NRC officer
Pete Snyder +
Notification date
17:22:00, 4 November 2010  +
Originated by
Ben Cook +
Procedure
AM +
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
0.515 d (12.37 hours, 0.0736 weeks, 0.0169 months)  +
Site
Monticello +
Start date
05:00:00, 4 November 2010  +
State
Minnesota +
System
Secondary containment +  and Standby Gas Treatment System +
TS
TS-3.6.4.1 +
Title
Containment Air Lock Doors Not Operated Properly  +
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/2010/20101105en.html#en46394  +
Unit
1  +
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