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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-III-23-002B, Prairie Island Update to PNO-III-23-002 Declaration of an Unusual Event Following a Turbine Generator and Reactor Trip Due to Fault on Unit 2 Generator Main Transformer2023-06-0808 June 2023
PNO-III-23-002B Prairie Island Update to PNO-III-23-002 Declaration of an Unusual Event Following a Turbine Generator and Reactor Trip Due to Fault on Unit 2 Generator Main Transformer
PNO-III-23-002, Prairie Island Nuclear Power Station Declaration of an Unusual Event Following a Turbine Generator and Reactor Trip Due to Fault on Unit 2 Generator Main Transformer2023-06-0101 June 2023
PNO-III-23-002 - Prairie Island Nuclear Power Station Declaration of an Unusual Event Following a Turbine Generator and Reactor Trip Due to Fault on Unit 2 Generator Main Transformer
PNO-III-15-011, Prairie Island Nuclear Plant: Shutdown of Unit 2 and Notice of Unusual Event2015-12-18018 December 2015
PNO-III-15-011 - Prairie Island Nuclear Plant: Shutdown of Unit 2 and Notice of Unusual Event
PNO-III-15-008, Prairie Island Unit 2 Shutdown Due to Trip of Main Power Turbine2015-06-0909 June 2015
PNO-III-15-008: Prairie Island Unit 2 Shutdown Due to Trip of Main Power Turbine
PNO-III-15-003, A: Update: Shutdown of Prairie Island Unit 2 Due to Loss of Instrument Air to Containment Building2015-03-26026 March 2015
PNO-III-15-003A: Update: Shutdown of Prairie Island Unit 2 Due to Loss of Instrument Air to Containment Building
ML15069A1852015-03-10010 March 2015
PNO-III-15-003 Prairie Island Nuclear Plant: Shutdown of Prairie Island Unit 2 Due to Loss of Instrument Air to Containment Building and Notification of Unusual Event
PNO-III-15-001, A: Update: Shutdown of Prairie Island Unit 1 Due to Increasing Trend in Reactor Coolant System Leakage2015-02-17017 February 2015
PNO-III-15-001A: Update: Shutdown of Prairie Island Unit 1 Due to Increasing Trend in Reactor Coolant System Leakage
ML15028A0232015-01-27027 January 2015
PNO-III-15-001 - Shutdown of Prairie Island Unit 1 Due to Increasing Trend in Reactor Coolant System Leakage
PNO-III-14-012, A Update: Shutdown of Prairie Island Unit 1 Due to Increasing Trend in Reactor Coolant System Leakage2014-12-29029 December 2014
PNO-III-14-012A Update: Shutdown of Prairie Island Unit 1 Due to Increasing Trend in Reactor Coolant System Leakage
ML14346A4682014-12-12012 December 2014
PNO-III-14-012 Shutdown of Prairie Island Unit 1 Due to Increasing Trend in Reactor Coolant System Leakage
PNO-III-12-014, Notification of Unusual Event at Prairie Island Nuclear Generating Plant2012-11-0101 November 2012
PNO-III-12-014, Notification of Unusual Event at Prairie Island Nuclear Generating Plant
ML12234A6382012-08-20020 August 2012
Update to Prairie Island Unit 1 Unplanned Shutdown Due to Both Emergency Diesel Generators Being Declared Inoperable
ML12229A3572012-08-16016 August 2012
PNO-lll-12-008 - Prairie Island, Unit 1 Unplanned Shutdown Due to Both Emergency Diesel Generators Being Declared Inoperable
PNO-III-11-013, A, Prairie Island Unit 2 Unplanned Shutdown for Greater than 72 Hours (Update)2011-10-20020 October 2011
PNO-III-11-013A, Prairie Island Unit 2 Unplanned Shutdown for Greater than 72 Hours (Update)
ML1127804832011-10-0505 October 2011
PNO-III-11-013 - Prairie Island Unit 2 Unplanned Shutdown for Greater than 72 Hours
PNO-III-10-002, Prairie Island Units 1 and 2, Fire in a Nonsafety-Related Diesel Generator2010-01-21021 January 2010
PNO-III-10-002, Prairie Island Units 1 and 2, Fire in a Nonsafety-Related Diesel Generator
PNO-III-09-003, Prairie Island - Unplanned Unit 1 Shutdown Greater than 72 Hours2009-05-20020 May 2009
PNO-III-09-003: Prairie Island - Unplanned Unit 1 Shutdown Greater than 72 Hours
PNO-III-08-007, A - Prairie Island, Unplanned Unit 1 Shutdown Greater than 72 Hours (Update)/ Notification of Unusual Event Due to a Release of a Toxic Gas Deemed Detrimental to Normal Operation of the Plant2008-08-0404 August 2008
PNO-III-08-007A - Prairie Island, Unplanned Unit 1 Shutdown Greater than 72 Hours (Update)/ Notification of Unusual Event Due to a Release of a Toxic Gas Deemed Detrimental to Normal Operation of the Plant
ML0821408742008-08-0101 August 2008
PNO-III-08-007, Prairie Island Unit 1, Unplanned Unit 1 Shutdown Greater than 72 Hours/Special Inspection
PNO-III-07-016, Prairie Island, Unplanned Unit 1 Shutdown Greater than 72 Hours2007-12-26026 December 2007
PNO-III-07-016: Prairie Island, Unplanned Unit 1 Shutdown Greater than 72 Hours
PNO-III-07-005, Prairie Island Non-Credible Bomb Threat2007-03-20020 March 2007
PNO-III-07-005 - Prairie Island Non-Credible Bomb Threat
PNO-III-06-003, Prairie Island Technical Specification Required Shutdown of Unit 2 for Greater than 72 Hours2006-02-0606 February 2006
PNO-III-06-003, Prairie Island Technical Specification Required Shutdown of Unit 2 for Greater than 72 Hours
PNO-III-05-009, Technical Specification Required Shutdown of Prairie Island Unit 2 for Greater than 72 Hours2005-04-20020 April 2005
PNO-III-05-009, Technical Specification Required Shutdown of Prairie Island Unit 2 for Greater than 72 Hours
2023-06-08
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PRELIMINARY NOTIFICATION- REGION III August 1, 2008 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-08-007
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 Nuclear Management Company (NMC)
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 GREATER THAN 72 HOURS/SPECIAL INSPECTION
DESCRIPTION:
On July 31, 2008 at 8:17a.m. the Unit 1 reactor tripped based on an overtemperature delta T (OTT) signal at the Prairie Island Site. At the time, one channel of the reactor trip system instrumentation was out of service for testing, and this, coupled with the OTT signal, caused the reactor trip.
All systems performed as expected with the exception of the turbine driven auxiliary feed water (AFW) pump which auto started but tripped 50 seconds later on low suction/discharge pressure.
The licensee is continuing to investigate. All rods inserted and all other AFW system components operated as expected. Applicable emergency operating procedures were entered and completed. The plant was shutdown in accordance with station procedures.
The NRC resident inspectors and region-based inspectors are monitoring this event. The duration of the unit shutdown is expected to be approximately 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The NRC has dispatched a Special Inspection team to the plant to review the root causes of the
reactor trip and the turbine driven AFW pump issue. The team will also focus on the licensee's corrective actions and extent of condition reviews.
The information in this preliminary notification has been reviewed with licensee management.
This information is current as of 11:30 a.m. on August 1, 2008.
CONTACTS: Richard Skokowski Karla Stoedter 630-829-9620 651-388-8209
