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ENS 41531
Show incoming properties
Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +  and 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +
Current power
0  +  and 85  +
Current reactor mode
Power Operation +  and Refueling +
Description
The following information was obtained fro … The following information was obtained from the licensee via facsimile (licensee text in quotes):</br>At 1930, Unit 1 experienced a loss of 480 VAC busses 18 and 19. This caused a loss of power to the Control Room Emergency Ventilation System (CREVS) and the CREVS Air Conditioning System (CREVS AC). This event also caused a loss of power to the U1 equipment that was supporting the Alternate Decay Heat Removal (ADHR) mode of operation.</br>Power was restored to Bus 19 at 2001 and Bus 18 at 2013. The restoration of Bus 18 also restored power to CREVS and CREVS AC. All systems supporting ADHR were restored by 2015. At the time of the occurrence, the estimated time to boil without decay heat removal capability was 571 minutes. All isolations and actuations occurred as expected. The cause of the bus trips is being investigated.</br>This Event is being reported under 50.72 (b)(3)(v)(B) and 50.72 (b)(3)(v)(D).</br>The licensee stated at the time of the event, Busses 18 and 19 were cross-tied and the feeder breaker to Bus 18 tripped open. The breaker was changed out and power to Busses 18 and 19 restored. The cause of the Bus 18 feeder breaker trip has not yet been determined. </br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM THE LICENSEE (OSELAND) TO NRC (HUFFMAN) AT 0312 EST ON 3/28/05 * * *</br>The licensee stated that the Alternate Decay Heat Removal pumps from Unit 2 remained in service so that all decay heat removal was not lost. The Unit 1 primary coolant system temperature increase during the 45 minute duration of this event was approximately 1 degree. R3DO (Kozak) has been notified. degree. R3DO (Kozak) has been notified.  +
Discovered date
01:30:00, 28 March 2005  +
ENS id number
41,531  +
Emergency class
Non Emergency +
Entered date
01:12:00, 28 March 2005  +
Event date
01:30:00, 28 March 2005  +
Event description
The following information was obtained fro … The following information was obtained from the licensee via facsimile (licensee text in quotes):</br>At 1930, Unit 1 experienced a loss of 480 VAC busses 18 and 19. This caused a loss of power to the Control Room Emergency Ventilation System (CREVS) and the CREVS Air Conditioning System (CREVS AC). This event also caused a loss of power to the U1 equipment that was supporting the Alternate Decay Heat Removal (ADHR) mode of operation.</br>Power was restored to Bus 19 at 2001 and Bus 18 at 2013. The restoration of Bus 18 also restored power to CREVS and CREVS AC. All systems supporting ADHR were restored by 2015. At the time of the occurrence, the estimated time to boil without decay heat removal capability was 571 minutes. All isolations and actuations occurred as expected. The cause of the bus trips is being investigated.</br>This Event is being reported under 50.72 (b)(3)(v)(B) and 50.72 (b)(3)(v)(D).</br>The licensee stated at the time of the event, Busses 18 and 19 were cross-tied and the feeder breaker to Bus 18 tripped open. The breaker was changed out and power to Busses 18 and 19 restored. The cause of the Bus 18 feeder breaker trip has not yet been determined. </br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM THE LICENSEE (OSELAND) TO NRC (HUFFMAN) AT 0312 EST ON 3/28/05 * * *</br>The licensee stated that the Alternate Decay Heat Removal pumps from Unit 2 remained in service so that all decay heat removal was not lost. The Unit 1 primary coolant system temperature increase during the 45 minute duration of this event was approximately 1 degree. R3DO (Kozak) has been notified. degree. R3DO (Kozak) 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 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +, ENS 41531 +  and ENS 41531 +
Initial power
0  +  and 85  +
Initial reactor mode
Power Operation +  and Refueling +
Last update date
00:00:00, 28 March 2005  +
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>.
22:41:18, 24 September 2017  +
NRC officer
Bill Huffman +
Notification date
01:12:00, 28 March 2005  +
Originated by
Tom Oseland +
Reactor critical
false  +  and 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 +  and 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +
Reporting time
-0.0125 d (-0.3 hours, -0.00179 weeks, -4.1094e-4 months)  +
Site
Quad Cities +
Start date
01:30:00, 28 March 2005  +
State
Illinois +
System
Control Room Emergency Ventilation +  and Decay Heat Removal +
Title
Electrical Safety Bus Trip During Quad Cities Unit 1 Refueling Outage  +
Topic
Time to boil +
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/2005/20050329en.html#en41531  +
Unit
1  +  and 2  +
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