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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 October 20, 2011 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-11-013A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. Some of the information may not yet be fully verified or evaluated by the Region III staff.
Facility Licensee Emergency Classification Prairie Island Nuclear Generating Plant, Unit 2 Notification of Unusual Event Northern States Power Company, Minnesota Alert Welch, Minnesota Site Area Emergency Docket No: 50-306 General Emergency License No: DPR-60 x Not Applicable
SUBJECT:
PRAIRIE ISLAND UNIT 2 UNPLANNED SHUTDOWN FOR GREATER THAN 72 HOURS (UPDATE)
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Description:==
On October 20, 2011, at approximately 03:43 a.m. CDT, Prairie Island Unit 2 was restarted after a forced outage. The outage began on October 4, 2011, after one of two reactor coolant pumps (RCP) experienced seal cooling water flow that was below procedural limits. The purpose of the seal is to keep water in the reactor coolant system. In order to keep the seal intact, a continuous flow of water is required. The rate at which flow comes out of a seal has to fall within a specified range in order to keep the RCP running. The licensee proceeded to shut down, as specified by their procedures, to replace the affected seal.
The licensee replaced the seals on both the RCPs during the forced shutdown. The NRC resident inspectors monitored the plant operator response during the shutdown and the reactor coolant pump seal replacement activities. Before the reactor start-up, the NRC inspectors reviewed the evaluations and tests performed to assure the adequacy of the plant repairs.
The inspectors were present in the control room to observe the Unit 2 restart.
Minnesota State officials have been informed of the plant restart. The information presented herein has been discussed with the licensee, and is current as of October 20, 2011, at 09:00 a.m. (CDT). This preliminary notification is issued for information only and no further action by the staff is anticipated.
ADAMS Accession Number ML11293A090 CONTACTS: Karla Stoedter Kenneth Riemer 651/388-8209 630/829-9628 Karla.Stoedter@nrc.gov Kenneth.Riemer@nrc.gov