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ENS 44931
Show incoming properties
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)(ii)(B), Unanalyzed Condition +, 10 CFR 50.72#b3iiB +  and 10 CFR 50.72#b3vA +
Current power
100  +
Current reactor mode
Power Operation +
Description
At 1700 on 3/23/09 Prairie Island staff de … At 1700 on 3/23/09 Prairie Island staff declared both trains of Unit 1 Component Cooling (CC) system inoperable due to discovery that a postulated missile hazard in the Fuel Handling Area could fail a CC line to 122 Spent Fuel Pool Heat Exchanger (SFP HX), affecting both trains of CC. This condition represented an unanalyzed condition reportable under 10 CFR 50.72(b)(3)(ii)(B) since the event might represent a significant degradation of plant safety. The inoperability of Unit 1 CC caused entry into Technical Specification LCO 3.0.3. The CC line in question does not have automatic closure and the resulting loss of CC inventory would eventually affect both trains of CC. This condition represents a loss of safety function for safe shutdown capability and is reportable per 10 CFR 50.72 (b)(3)(v)(A). </br>122 SFP HX was last modified by design change 99SF02 to allow for full redundant capacity of the 121 SFP HX. While seismic was addressed in the design change, tornado protection was not.</br>The CC line to the 122 SFP HX was isolated at 1759 on 3/23/09 returning Unit 1 CC to operable status. Unit 1 remained at 100% power. </br>121 SFP HX is currently in service and is in a location that meets the missile protection requirements.</br>The condition was discovered during a tornado protection vulnerability walk-down. A similar line on Unit 2 was already isolated. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.  +
Discovered date
22:00:00, 23 March 2009  +
ENS id number
44,931  +
Emergency class
Non Emergency +
Entered date
23:10:00, 23 March 2009  +
Event date
22:00:00, 23 March 2009  +
Event description
At 1700 on 3/23/09 Prairie Island staff de … At 1700 on 3/23/09 Prairie Island staff declared both trains of Unit 1 Component Cooling (CC) system inoperable due to discovery that a postulated missile hazard in the Fuel Handling Area could fail a CC line to 122 Spent Fuel Pool Heat Exchanger (SFP HX), affecting both trains of CC. This condition represented an unanalyzed condition reportable under 10 CFR 50.72(b)(3)(ii)(B) since the event might represent a significant degradation of plant safety. The inoperability of Unit 1 CC caused entry into Technical Specification LCO 3.0.3. The CC line in question does not have automatic closure and the resulting loss of CC inventory would eventually affect both trains of CC. This condition represents a loss of safety function for safe shutdown capability and is reportable per 10 CFR 50.72 (b)(3)(v)(A). </br>122 SFP HX was last modified by design change 99SF02 to allow for full redundant capacity of the 121 SFP HX. While seismic was addressed in the design change, tornado protection was not.</br>The CC line to the 122 SFP HX was isolated at 1759 on 3/23/09 returning Unit 1 CC to operable status. Unit 1 remained at 100% power. </br>121 SFP HX is currently in service and is in a location that meets the missile protection requirements.</br>The condition was discovered during a tornado protection vulnerability walk-down. A similar line on Unit 2 was already isolated. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.  +
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 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +, ENS 44931 +  and ENS 44931 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 23 March 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>.
02:12:28, 2 March 2018  +
NRC officer
Joe O'Hara +
Notification date
23:10:00, 23 March 2009  +
Originated by
William Bodine +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
Westinghouse PWR 2-Loop +
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)(ii)(B), Unanalyzed Condition +
Reporting time
0.0488 d (1.17 hours, 0.00696 weeks, 0.0016 months)  +
Site
Prairie Island +
Start date
22:00:00, 23 March 2009  +
State
Minnesota +
TS
TS-3.0.3 +
Title
Unanalyzed Condition for Postulated Missile Hazard That Could Disable Both Trains of Component Cooling  +
Topic
Safe Shutdown +  and Unanalyzed Condition +
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/2009/20090324en.html#en44931  +
Unit
1  +
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