Browse wiki

Jump to navigation Jump to search
ENS 42010
Show incoming properties
Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +, 10 CFR 50.72#b2iv +  and 10 CFR 50.72#b3iv +
Current power
0  +
Current reactor mode
Hot Shutdown +
Description
At 0040 hours Central Daylight Time, Coope … At 0040 hours Central Daylight Time, Cooper Nuclear Station was manually scrammed due to degrading main condenser vacuum. Subsequent to the scram, reactor vessel level lowered to minus 20 inches wide range which corresponds to approximately 140 inches above the top of fuel. A Primary Containment Isolation System (PCIS) group 2 isolation occurred as expected due to the level transient. All automatic actions occurred as expected.</br>This report includes both a 4 hour and an 8 hour report. The 4 hour report is being made pursuant to 10CFR50.72(b)(2)(iv)(b), Actuation of RPS when the reactor is critical. The 8 hour report is being made pursuant to 10CFR50.72(b)(3)(iv)(a), Actuation of PCIS group 2 due to expected RPV low level following the scram.</br>The NRC Resident Inspector has been informed of the event.</br>All control rods fully inserted following the scram. All safety-related equipment including Emergency Diesel Generators are operable. Offsite power is stable and available. RPV water level is currently being maintained at approximately 35 inches with feedwater supplied by the condensate pumps. The cause of the degrading main condenser vacuum is unknown and under investigation. The RWCU Heat Exchanger is in service to remove decay heat.hanger is in service to remove decay heat.  +
Discovered date
05:40:00, 23 September 2005  +
ENS id number
42,010  +
Emergency class
Non Emergency +
Entered date
04:38:00, 23 September 2005  +
Event date
05:40:00, 23 September 2005  +
Event description
At 0040 hours Central Daylight Time, Coope … At 0040 hours Central Daylight Time, Cooper Nuclear Station was manually scrammed due to degrading main condenser vacuum. Subsequent to the scram, reactor vessel level lowered to minus 20 inches wide range which corresponds to approximately 140 inches above the top of fuel. A Primary Containment Isolation System (PCIS) group 2 isolation occurred as expected due to the level transient. All automatic actions occurred as expected.</br>This report includes both a 4 hour and an 8 hour report. The 4 hour report is being made pursuant to 10CFR50.72(b)(2)(iv)(b), Actuation of RPS when the reactor is critical. The 8 hour report is being made pursuant to 10CFR50.72(b)(3)(iv)(a), Actuation of PCIS group 2 due to expected RPV low level following the scram.</br>The NRC Resident Inspector has been informed of the event.</br>All control rods fully inserted following the scram. All safety-related equipment including Emergency Diesel Generators are operable. Offsite power is stable and available. RPV water level is currently being maintained at approximately 35 inches with feedwater supplied by the condensate pumps. The cause of the degrading main condenser vacuum is unknown and under investigation. The RWCU Heat Exchanger is in service to remove decay heat.hanger is in service to remove decay heat.  +
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 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +, ENS 42010 +  and ENS 42010 +
Hours
4.62963e-4 d (0.0111 hours, 6.613757e-5 weeks, 1.522e-5 months)  +, 4.62963e-5 d (0.00111 hours, 6.613757e-6 weeks, 1.522e-6 months)  +  and 9.259259e-5 d (0.00222 hours, 1.322751e-5 weeks, 3.044e-6 months)  +
Initial power
75  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 23 September 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>.
02:20:11, 2 March 2018  +
NRC officer
Steve Sandin +
Notification date
04:38:00, 23 September 2005  +
Originated by
Steve Wheeler +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
GE-4 +
Region
NRC Region 4 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Reporting time
-0.0429 d (-1.03 hours, -0.00613 weeks, -0.00141 months)  +
Scram
Manual Scram +
Site
Cooper +
Start date
05:40:00, 23 September 2005  +
State
Nebraska +
System
Feedwater +, Emergency Diesel Generator +, Primary Containment Isolation System +, Main Condenser +  and Control Rod +
Title
Manual Reactor Scram Due to Degrading Main Condenser Vacuum  +
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/2005/20050926en.html#en42010  +
Unit
1  +
Retrieved from "https://kanterella.com/Special:Browse/:ENS-5F42010"