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ENS 50688
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Current power
0  +
Current reactor mode
Hot Standby +
Description
At 1014 (CST) on 12/17/2014, the reactor a … At 1014 (CST) on 12/17/2014, the reactor automatically tripped due to loss of load on RPS (Reactor Protection System). Preliminary information indicates turbine-generator trip caused an uncomplicated reactor trip . All safety functions are met. Currently maintaining Mode 3, Hot Shutdown. At time of trip, non-safety related house transformers, T1A1 and T1A2 became inoperable as expected due to generator trip. Entered Technical Specification 2.7 (2)a, 72 hr LCO (for the inoperable T1A1 and T1A2 transformers).</br>All control rods fully inserted. All busses are energized via offsite power. Decay heat is being released via AFW and the condenser bypass valves. The unit is stable in Mode 3. Cause of the loss of load is being investigated.</br>The NRC Resident Inspector has been informed. NRC Resident Inspector has been informed.  +
Discovered date
16:14:00, 17 December 2014  +
ENS id number
50,688  +
Emergency class
Non Emergency +
Entered date
12:56:00, 17 December 2014  +
Equipment trip
Reactor Trip +
Event date
16:14:00, 17 December 2014  +
Event description
At 1014 (CST) on 12/17/2014, the reactor a … At 1014 (CST) on 12/17/2014, the reactor automatically tripped due to loss of load on RPS (Reactor Protection System). Preliminary information indicates turbine-generator trip caused an uncomplicated reactor trip . All safety functions are met. Currently maintaining Mode 3, Hot Shutdown. At time of trip, non-safety related house transformers, T1A1 and T1A2 became inoperable as expected due to generator trip. Entered Technical Specification 2.7 (2)a, 72 hr LCO (for the inoperable T1A1 and T1A2 transformers).</br>All control rods fully inserted. All busses are energized via offsite power. Decay heat is being released via AFW and the condenser bypass valves. The unit is stable in Mode 3. Cause of the loss of load is being investigated.</br>The NRC Resident Inspector has been informed. NRC Resident Inspector has been informed.  +
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 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +, ENS 50688 +  and ENS 50688 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 17 December 2014  +
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>.
01:48:58, 2 March 2018  +
NRC officer
John Shoemaker +
Notification date
12:56:00, 17 December 2014  +
Originated by
Laurel Ketcham +
Reactor critical
true  +
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
-0.138 d (-3.3 hours, -0.0196 weeks, -0.00452 months)  +
Scram
Automatic Scram +
Site
Fort Calhoun +
Start date
16:14:00, 17 December 2014  +
State
Nebraska +
System
Control Rod +
TS
TS-2.7 +
Title
Automatic Reactor Trip Due to Loss of Load  +
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/2014/20141218en.html#en50688  +
Unit
1  +
 
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