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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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February 06, 2006 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-06-003 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 Staff on this date.
Facility Licensee Emergency Classification Prairie Island Nuclear Generating Plant Notification of Unusual Event Nuclear Management Company Alert Welch, MN. Site Area Emergency Docket: 50-282 and 50-306 General Emergency License: DPR 42 and DPR 60 X Not Applicable
SUBJECT:
TECHNICAL SPECIFICATION REQUIRED SHUTDOWN OF PRAIRIE ISLAND UNIT 2 FOR GREATER THAN 72 HOURS DESCRIPTION:
Prairie Island Unit 2 was shutdown on February 5, 2006, at 11:42 p.m. due to an inoperable diesel generator. Specifically, during testing of diesel generator D6, elevated crankcase pressure was observed on engine 1, and the licensee determined repairs could not be completed in the Technical Specification allowed outage time. Prairie Island Unit 2 has two dedicated diesel generator sets. Each diesel generator set consists of two engines driving a common generator. The diesel generator sets were manufactured by Soc,t, Alsacienne de Constructions M,chaniques de Mullhouse (SACM).
The licensee removed the D6 diesel generator from service and entered a seven-day Technical Specification Allowed Outage Time at 8:10 p.m. on January 29, 2006, for the planned replacement of four pistons and cylinder liners on engine 2. Following the replacement and completion of a 12-hour break-in run, the licensee commenced surveillance testing to demonstrate operability of diesel generator D6. During testing, operators observed high crankcase pressure on engine 1 and aborted the test. Licensee troubleshooting determined that the high crankcase pressure was caused by passage of combustion gases between the piston rings and cylinder liner to the crankcase (blow-by). The licensee evaluated the condition of all 16 cylinders on engine 1 and concluded that all the cylinder liners and piston rings should be replaced on both engines. The licensee determined that the required repairs could not be conducted within the Technical Specification allowed outage time due to expire at 8:10 p.m. on February 5, 2006, and commenced a shutdown of Unit 2 at 1:36 p.m. In compliance with the plants Technical Specifications, the reactor was shutdown at 11:42 p.m. and is currently in Mode 3.
The cause of the high crankcase pressure identified on diesel generator D6 is currently under investigation. The licensee last replaced all of the cylinder liners, and piston rings on diesel
generator D6 in early 2001, to correct adverse conditions caused by an incompatibility between lubricating and fuel oils. Region III personnel will continue to follow the licensee's root cause investigation and monitor its recovery actions.
Region III received initial notification of this occurrence by discussion between the Senior Resident Inspector and Prairie Island Plant Manager at approximately 10:30 a.m. on Sunday, February 5. The information presented herein has been discussed with the licensee, and is current as of 7:00 a.m. EDT, February 6, 2006.
CONTACTS: John Adams Richard Skokowski jta@nrc.gov ras@nrc.gov (651) 388-8209 (630) 829-9620
