PNO-III-09-003, Prairie Island - Unplanned Unit 1 Shutdown Greater than 72 Hours: Difference between revisions
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{{#Wiki_filter:PRELIMINARY NOTIFICATION- REGION III May 20, 2009 | {{#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 Licensee Emergency Classification Prairie Island Unit 1 Notification of Unusual Event Northern States Power-Minnesota Alert Welch, Minnesota Site Area Emergency Docket: 50-282 General Emergency License: DPR-42 X Not Applicable | |||
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: | |||
==SUBJECT:== | ==SUBJECT:== | ||
UNPLANNED UNIT 1 SHUTDOWN | 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. | |||
DESCRIPTION: | 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 licensees progress. | |||
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. | State and local officials have been informed about the situation. | ||
The information in this preliminary notification has been reviewed with licensee management. | |||
The licensee is investigating the cause of the pump trip and considering options for testing the pump and plant restart. | 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}} | |||
The NRC resident inspectors are evaluating the | |||
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: | |||
{{PNO-Nav|region=III}} | {{PNO-Nav|region=III}} | ||
Latest revision as of 06:39, 14 November 2019
| ML091400515 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 05/20/2009 |
| From: | Jack Giessner, Karla Stoedter NRC/RGN-III |
| To: | |
| References | |
| PNO-III-09-003 | |
| Download: ML091400515 (1) | |
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 Licensee Emergency Classification Prairie Island Unit 1 Notification of Unusual Event Northern States Power-Minnesota Alert Welch, Minnesota Site Area Emergency Docket: 50-282 General Emergency License: DPR-42 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 licensees 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