United States Nuclear Regulatory Commission - Protecting People and the Environment

Preliminary Notification (PN) Reports for 2015

| January | February | March | April | May | June | July | August | September | October | November | December |

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December
PNO-III-15-010A 12/03/2015 Northern States Power Co.: (Update) Monticello Automatic Scram Due to Reactor Protection System Signal
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November
PNO-III-15-010 11/27/2015 Northern States Power Co.: Monticello Automatic Scram Due to Reactor Protection System Signal
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October
PNO-III-15-009A 10/02/2015 DTE Energy Company: (Update) Fermi Power Plant – Unplanned Shutdown Greater than 72 Hours Following the Loss of Cooling Water in the Turbine Building
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September
PNO-III-15-009 09/15/2015 DTE Energy Company: Fermi Power Plant – Unplanned Shutdown Greater than 72 Hours Following the Loss of Cooling Water in the Turbine Building
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August
PNO-IV-15-02-A 08/26/2015 International Isotopes Incorporated: (Update) – Personnel Radiation Overexposure in Excess of Regulatory Limits
PNO-IV-15-02 08/21/2015 International Isotopes Incorporated: Personnel Radiation Overexposure in Excess of Regulatory Limits
PNO-II-15-002A 08/19/2015 Honeywell International, Inc.: (Update) – Alert At Honeywell Metropolis Works Due To Uf6 Leak
PNO-II-15-002 08/02/2015 Honeywell International, Inc.: Alert At Honeywell Metropolis Works Due To Uf6 Leak
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July
PNO-III-15-007-A 07/30/2015 Indiana Michigan Power Company: (Update) – Technical Specification Required Shutdown of D.C. Cook Unit 1 due to an Inoperable Emergency Diesel Generator
PNO-IV-15-001-A 07/28/2015 Union Electric Company: (Update) – Callaway Plant Technical Specification Shutdown Due To Reactor Coolant System Leakage
PNO-IV-15-001 07/24/2015 Union Electric Company: Callaway Plant Technical Specification Shutdown Due to Reactor Coolant System Leakage
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June
PNO-III-15-008 06/09/2015 Northern States Power Co.: Prairie Island Unit 2 Shutdown due to Trip of Main Power Turbine
PNO-III-15-007 06/02/2015 Indiana Michigan Power Company: Technical Specification Required Shutdown of D.C. Cook Unit 1 due to an Inoperable Emergency Diesel Generator
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May
PNO-I-15-002A 05/27/2015 Entergy Nuclear Operations, Inc.: (Update) – Indian Point Nuclear Power Station Unit No. 3 – Shutdown Greater than 72 Hours due to Reactor Trip Following #31 Main Transformer Failure
PNO-III-15-006 05/13/2015 FirstEnergy Nuclear Operating Co: Shutdown of Davis-Besse Due to Secondary Side Steam Line Rupture
PNO-I-15-002 05/11/2015 Entergy Nuclear Operations, Inc.: Indian Point Nuclear Power Station Unit No. 3 – Shutdown Greater than 72 Hours due to Reactor Trip Following #31 Main Transformer Failure
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April
PNO-III-15-005A 04/06/2015 DTE Energy Company: (Update) – Fermi Power Plant – Unplanned Shutdown Greater Than 72 Hours Following a Cooling Water Leak in Containment
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March
PNO-III-15-003A 03/26/2015 Northern States Power Co.: (Update) – Shutdown of Prairie Island Unit 2 Due to Loss of Instrument Air to Containment Building
PNO-III-15-005 03/24/2015 DTE Energy Company: Fermi Power Plant – Unplanned Shutdown Greater Than 72 Hours Following a Cooling Water Leak in Containment
PNO-III-15-004 03/10/2015 Exelon Generation Company, LLC: Byron Unit 1 Automatic Shutdown After Falling Ice Caused Main Power Transformer Short Circuit
PNO-III-15-003 03/10/2015 Northern States Power Co.: Shutdown of Prairie Island Unit 2 Due To Loss of Instrument Air To Containment Building and Notification of Unusual Event
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February
PNO-II-15-001A 02/23/2015 NextEra Energy: (Update) – St. Lucie, Unit 2 – Shutdown Greater than 72 Hours due to Condenser Tube Leak
PNO-II-15-001 02/17/2015 NextEra Energy: St. Lucie, Unit 2 – Shutdown Greater than 72 Hours due to Condenser Tube Leak
PNO-III-15-001A 02/17/2015 Northern States Power Co.: (Update) – Shutdown of Prairie Island Unit 1 due to Increasing Trend in Reactor Coolant System Leakage
PNO-III-15-002 02/11/2015 Exelon Generation Co.: Dresden Unit 2 Shutdown due to Loss Of Feedwater Level Control
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January
PNO-I-15-001 01/29/2015 Pilgrim Nuclear Power Station: Shutdown greater than 72 hours due to Reactor Scram following a Partial Loss of Offsite Power
PNO-III-15-001 01/27/2015 Northern States Power Co.: Shutdown of Prairie Island Unit 1 due to Increasing Trend In Reactor Coolant System Leakage
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Page Last Reviewed/Updated Thursday, April 07, 2016