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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARML21190A2422021-07-0909 July 2021 PNO-lll-21-001A: Donald C. Cook Nuclear Plant, Unit 2, Update: Unplanned Shutdown Greater than 7 Days Due to Main Steam Leakage ML21181A4162021-06-30030 June 2021 PNO-lll-21-001 Donald C. Cook Nuclear Plant, Unit 2: Unplanned Shutdown Greater than 7 Days Due to Main Steam Leakage PNO-III-20-001A, Update: Unplanned Shutdown Greater than 72 Hours Due to Reactor Coolant System Leakage Exceeding Technical Specification Limits2020-05-11011 May 2020 PNO-III-20-001A Update: Unplanned Shutdown Greater than 72 Hours Due to Reactor Coolant System Leakage Exceeding Technical Specification Limits PNO-III-20-001, Unplanned Shutdown Greater than 72 Hours Due to Reactor Coolant System Leakage Exceeding Technical Specification Limits2020-05-0404 May 2020 PNO-III-20-001: Unplanned Shutdown Greater than 72 Hours Due to Reactor Coolant System Leakage Exceeding Technical Specification Limits ML17256A7152017-09-13013 September 2017 PNO-III-2017-002: Donald C. Cook Notice of Unusual Event During Plant Shutdown Due to Increased Reactor Coolant System Leakage PNO-III-16-003, D.C. Cook Unit 2 Manual Trip Resulting in a Shutdown for Greater than 72 Hours2016-07-12012 July 2016 PNO-III-16-003: D.C. Cook Unit 2 Manual Trip Resulting in a Shutdown for Greater than 72 Hours PNO-III-15-007, A - D.C. Cook: Update to Technical Specification Required Shutdown of D.C. Cook Unit 1 Due to an Inoperable Emergency Diesel Generator2015-07-30030 July 2015 PNO-III-15-007A - D.C. Cook: Update to Technical Specification Required Shutdown of D.C. Cook Unit 1 Due to an Inoperable Emergency Diesel Generator ML15153A6192015-06-0202 June 2015 PNO-III-15-007 - D.C. Cook: Technical Specification Required Shutdown of D.C. Cook Unit 1 Due to an Inoperable Emergency Diesel Generator ML14316A5922014-11-12012 November 2014 PNO-lll-14-010A - Update: D.C. Cook Dual Unit Manual Trip Resulting in a Shutdown for Greater than 72 Hours on Unit 2 PNO-III-14-010, D.C. Cook Dual Unit Manual Trip Resulting in a Shutdown for Greater than 72 Hours on Unit 22014-11-0404 November 2014 PNO-III-14-010: D.C. Cook Dual Unit Manual Trip Resulting in a Shutdown for Greater than 72 Hours on Unit 2 ML1123601032011-08-23023 August 2011 PNO-II-11-005: North Anna, Emergency Declarations Due to Seismic Event PNO-I-10-003, Unusual Event Declarations Due to Seismic Activity (Vermont Yankee and D.C. Cook)2010-06-23023 June 2010 PNO-I-10-003: Unusual Event Declarations Due to Seismic Activity (Vermont Yankee and D.C. Cook) PNO-III-09-015, D.C. Cook Unit 1, Return to 100 Percent Power2009-12-23023 December 2009 PNO-III-09-015: D.C. Cook Unit 1, Return to 100 Percent Power PNO-III-09-014, D.C. Cook Unit 1, Restart2009-12-18018 December 2009 PNO-III-09-014: D.C. Cook Unit 1, Restart PNO-III-09-013, D. C. Cook Unit 1 Mode Change Following 14 Months Forced Outage2009-11-23023 November 2009 PNO-III-09-013 - D. C. Cook Unit 1 Mode Change Following 14 Months Forced Outage PNO-III-09-006, A: D.C. Cook Unit 2, Forced Shutdown for Greater than 72 Hours to Repair Reactor Coolant Pump Seal (Update)2009-08-10010 August 2009 PNO-III-09-006A: D.C. Cook Unit 2, Forced Shutdown for Greater than 72 Hours to Repair Reactor Coolant Pump Seal (Update) ML0920901352009-07-28028 July 2009 PNO-III-09-006: D.C. Cook, Unit 2 Forced Shutdown for Greater than 72 Hours to Repair Reactor Coolant Pump Seal PNO-III-08-011, D. C. Cook - Unit 1 Manual Trip Due to Main Turbine Generator Fire and Significant Fire Suppression System Degradation2008-09-22022 September 2008 PNO-III-08-011: D. C. Cook - Unit 1 Manual Trip Due to Main Turbine Generator Fire and Significant Fire Suppression System Degradation PNO-III-08-004, A, Cook and Palisades, Update - Unusual Events Declared Due to Earthquake2008-04-18018 April 2008 PNO-III-08-004A, Cook and Palisades, Update - Unusual Events Declared Due to Earthquake ML0810903102008-04-18018 April 2008 PNO-III-08-004: Cook & Palisades, Unusual Events Declared Due to Earthquake PNO-III-06-017, A: D.C. Cook: Unit 1 Shuts Down Due to High Containment Air Temperature (Update)2006-08-0303 August 2006 PNO-III-06-017A: D.C. Cook: Unit 1 Shuts Down Due to High Containment Air Temperature (Update) ML0621302182006-08-0101 August 2006 PNO-III-06-017: D. C. Cook Unit 1 Shuts Down Due to High Containment Air Temperature PNO-III-05-015, D. C. Cook Unit 2 Special Inspection of Electrical Problems After Reactor Trip2005-11-10010 November 2005 PNO-III-05-015: D. C. Cook Unit 2 Special Inspection of Electrical Problems After Reactor Trip PNO-III-04-004, Indiana Michigan Power Co, Shutdown of D.C. Cook Unit 1 for Greater than 72 Hours2004-03-30030 March 2004 PNO-III-04-004: Indiana Michigan Power Co, Shutdown of D.C. Cook Unit 1 for Greater than 72 Hours PNO-III-03-021, D.C. Cook Dual Unit Shutdown Resulting from Fish Intrusion2003-04-24024 April 2003 PNO-III-03-021: D.C. Cook Dual Unit Shutdown Resulting from Fish Intrusion PNO-III-03-002, D.C. Cook Reactor Trip Due to Main Transformer Fire2003-01-21021 January 2003 PNO-III-03-002: D.C. Cook Reactor Trip Due to Main Transformer Fire PNO-III-02-025, A - Alert -- Fire in D.C. Cook Unit 1 Switchyard (Update)2002-06-13013 June 2002 PNO-III-02-025A - Alert -- Fire in D.C. Cook Unit 1 Switchyard (Update) 2021-07-09
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PRELIMINARY NOTIFICATION June 30, 2021 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-21-001 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 and is basically all that is known by the Region III staff on this date.
Facility Licensee Emergency Classification Donald C. Cook Nuclear Plant, Unit 2 Notification of Unusual Event Indiana Michigan Power Company Alert Stevensville, MI Site Area Emergency Docket No: 50-316 General Emergency X Not Applicable
SUBJECT:
UNPLANNED SHUTDOWN GREATER THAN 7 DAYS DUE TO MAIN STEAM LEAKAGE On June 22, 2021, at 11:31 p.m. EDT, with the plant at full power, operators at the Donald C. Cook Nuclear Plant manually tripped the Unit 2 reactor in response to a steam leak in the turbine building. The steam leak was quickly isolated and decay heat was initially removed by the steam dump system. No personnel were injured during the leak.
On June 24, 2021, the licensee began removing decay heat using the steam generator powered operated relief valves to facilitate personnel access during repair/investigation activities. There was no radioactive release.
All other systems functioned normally. Unit 1 remains at full power. There was no impact on public health.
Region III received initial notification of this occurrence by telephone call from the licensee at 12:25 a.m. EDT on June 23, 2021. The resident inspector responded to the plant, walked down the area of the steam leak and monitored plant parameters.
The State of Michigan has been notified.
This preliminary notification is issued for information only.
The information presented herein has been discussed with the licensee, and is current as of 5:15 p.m. EDT on June 30, 2021.
ADAMS Accession Number: ML21181A416
Contact:
N. Feliz-Adorno (630) 829-9739 Nestor.Feliz-Adorno@nrc.gov