PNO-III-09-003: Difference between revisions

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{{Adams
#REDIRECT [[PNO-III-09-003, Prairie Island - Unplanned Unit 1 Shutdown Greater than 72 Hours]]
| number = ML091400515
| issue date = 05/20/2009
| title = PNO-III-09-003: Prairie Island - Unplanned Unit 1 Shutdown Greater than 72 Hours
| author name = Giessner J, Stoedter K
| author affiliation = NRC/RGN-III
| addressee name =
| addressee affiliation =
| docket = 05000282
| license number = DPR-042
| contact person =
| document report number = PNO-III-09-003
| document type = NRC Preliminary Notification of Event/Occurrence
| page count = 1
}}
{{#Wiki_filter:PRELIMINARY NOTIFICATION- REGION III May 20, 2009
 
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-09-003
 
This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date.
Facility Prairie Island Unit 1 Northern States Power-Minnesota Welch, Minnesota Docket:  50-282 License:  DPR-42 Licensee Emergency Classification Notification of Unusual Event Alert      Site Area Emergency General Emergency X  Not Applicable
 
==SUBJECT:==
UNPLANNED UNIT 1 SHUTDOWN
 
DESCRIPTION:
 
On May 18, 2009 at 1:05 p.m. (CDT), the Unit 1 reactor tripped after a trip of the 12 circulating water pump. The trip of the circulating water pump resulted in a condenser A/B differential pressure trip of the main turbine which in turn caused an automatic reactor trip. Auxiliary Feedwater Pumps automatically started on low steam generator level. All control rods fully inserted and the other plant equipment responded as expected. The 12 circulating water pump is one of two pumps needed to operate at full power. 
 
The licensee is investigating the cause of the pump trip and considering options for testing the pump and plant restart.
 
The NRC resident inspectors are evaluating the licensee's progress.
 
State and local officials have been informed about the situation.
 
The information in this preliminary notification has been reviewed with licensee management.
 
This information is current as of 10:00 a.m.
on May 20, 2009.
 
CONTACTS:  Jack Giessner  Karla Stoedter 630-829-9619    651-388-8209}}
 
{{PNO-Nav|region=III}}

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