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ENS 46830
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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
With Unit 2 at 100% power and Unit 1 in Mo … With Unit 2 at 100% power and Unit 1 in Mode 6 and severe weather in the vicinity, (a) Unit 2 Main Generator Lockout trip occurred at 0722 (CDT). The reactor trip was 'Turbine Trip'. Procedure 2E-0, 'Reactor Trip or Safety Injection' was completed at 0725 hrs. (with) no Safety Injection required. (Procedure) 2ES-0.1, 'Reactor Trip Recovery' is in progress. Offsite power remains on all safeguards buses for both units. (The) 21 and 22 AFW (Auxiliary Feed Water) pumps automatically started on steam generator low level and are supplying Unit 2 steam generators. Unit 1 shutdown cooling was not affected.</br>Reportable actuations are: Unit 2 Reactor Protection (scram), Unit 2 AFW pumps automatic start.</br>The licensee has notified the State of Wisconsin, the State of Minnesota, the Prairie Island Indian Nation and the NRC Resident Inspector. They will be issuing a press release.or. They will be issuing a press release.  +
Discovered date
12:22:00, 9 May 2011  +
ENS id number
46,830  +
Emergency class
Non Emergency +
Entered date
08:44:00, 9 May 2011  +
Equipment trip
Turbine Trip +  and Reactor Trip +
Event date
12:22:00, 9 May 2011  +
Event description
With Unit 2 at 100% power and Unit 1 in Mo … With Unit 2 at 100% power and Unit 1 in Mode 6 and severe weather in the vicinity, (a) Unit 2 Main Generator Lockout trip occurred at 0722 (CDT). The reactor trip was 'Turbine Trip'. Procedure 2E-0, 'Reactor Trip or Safety Injection' was completed at 0725 hrs. (with) no Safety Injection required. (Procedure) 2ES-0.1, 'Reactor Trip Recovery' is in progress. Offsite power remains on all safeguards buses for both units. (The) 21 and 22 AFW (Auxiliary Feed Water) pumps automatically started on steam generator low level and are supplying Unit 2 steam generators. Unit 1 shutdown cooling was not affected.</br>Reportable actuations are: Unit 2 Reactor Protection (scram), Unit 2 AFW pumps automatic start.</br>The licensee has notified the State of Wisconsin, the State of Minnesota, the Prairie Island Indian Nation and the NRC Resident Inspector. They will be issuing a press release.or. They will be issuing a press release.  +
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ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +, ENS 46830 +  and ENS 46830 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 9 May 2011  +
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>.
02:07:14, 2 March 2018  +
NRC officer
Howie Crouch +
Notification date
08:44:00, 9 May 2011  +
Originated by
John Kempkes +
Reactor critical
true  +
Reactor type
Westinghouse PWR 2-Loop +
Region
NRC Region 3 +
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
-0.151 d (-3.63 hours, -0.0216 weeks, -0.00497 months)  +
SSC
2E-0 +  and 2ES-0 +
Scram
Automatic Scram +
Site
Prairie Island +
Start date
12:22:00, 9 May 2011  +
State
Minnesota +  and Wisconsin +
System
Steam Generator +  and Shutdown Cooling +
Title
Automatic Reactor Trip Upon Turbine Trip Due to Main Generator Lockout  +
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/2011/20110510en.html#en46830  +
Unit
2  +
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