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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-III-18-002, Beaver Valley, Davis-Besse, Perry Notification of Bankruptcy Filing by Firstenergy Solutions2018-04-0404 April 2018 PNO-III-18-002: Beaver Valley, Davis-Besse, Perry Notification of Bankruptcy Filing by Firstenergy Solutions PNO-III-16-004, A - Unplanned Shutdown of Davis-Besse Nuclear Power Station for Greater than 72 Hours - Update2016-09-23023 September 2016 PNO-III-16-004A - Unplanned Shutdown of Davis-Besse Nuclear Power Station for Greater than 72 Hours - Update ML16257A2032016-09-13013 September 2016 PNO-III-16-004, Davis-Besse Nuclear Power Station, Unplanned Shutdown for Greater than 72 Hours PNO-III-15-006, Davis-Besse Shutdown Due to Secondary Side Steam Line Rupture2015-05-13013 May 2015 PNO-III-15-006: Davis-Besse Shutdown Due to Secondary Side Steam Line Rupture PNO-III-14-003, A - Update to Davis-Besse Shield Building Restoration2014-04-28028 April 2014 PNO-III-14-003A - Update to Davis-Besse Shield Building Restoration ML14050A0262014-02-19019 February 2014 PNO-III-14-003: Davis-Besse Shield Building Voids PNO-III-13-007, Davis-Besse Shield Building Laminar Cracks2013-09-20020 September 2013 PNO-III-13-007 Davis-Besse Shield Building Laminar Cracks PNO-III-13-006, A: Davis Besse Preliminary Notification Update Unplanned Shutdown Greater than 72 Hours on June 29, 2013, Due to Trip of Reactor Coolant Pump and Subsequent Discovery of Reactor Pressure Boundary Leakage2013-07-15015 July 2013 PNO-III-13-006A: Davis Besse Preliminary Notification Update Unplanned Shutdown Greater than 72 Hours on June 29, 2013, Due to Trip of Reactor Coolant Pump and Subsequent Discovery of Reactor Pressure Boundary Leakage ML13184A1762013-07-0202 July 2013 PNO-III-13-006 - Davis Besse Unplanned Shutdown Greater than 72 Hours on June 26, 2013, Due to Trip of Reactor Coolant Pump and Subsequent Discovery of Reactor Pressure Boundary Leakage PNO-III-11-014, Davis-Besse Shield Building Indications2011-10-20020 October 2011 PNO-III-11-014, Davis-Besse Shield Building Indications PNO-III-10-011, DAVIS-BESSE Start-Up of Following Repairs of Control Rod Drive Mechanism Nozzle Flaw Indications2010-06-29029 June 2010 PNO-III-10-011 - DAVIS-BESSE Start-Up of Following Repairs of Control Rod Drive Mechanism Nozzle Flaw Indications PNO-III-10-008, Davis-Besse, Public Availability of Two NRC Employee Differing Professional Opinions Concerning Past Issues at Davis-Besse2010-05-20020 May 2010 PNO-III-10-008: Davis-Besse, Public Availability of Two NRC Employee Differing Professional Opinions Concerning Past Issues at Davis-Besse PNO-III-10-003, A - Davis-Besse Nuclear Power Station - Update - Davis-Besse Control Rod Drive Mechanism Nozzle Indications2010-04-12012 April 2010 PNO-III-10-003A - Davis-Besse Nuclear Power Station - Update - Davis-Besse Control Rod Drive Mechanism Nozzle Indications ML1007503172010-03-16016 March 2010 PNO-III-10-003 - Davis-Besse Nuclear Power Station - Davis-Besse Control Rod Drive Mechanism Nozzle Indications PNO-III-09-005, A: Davis-Besse, Transitory Alert Due to Electric Device Failure (Update)2009-06-29029 June 2009 PNO-III-09-005A: Davis-Besse, Transitory Alert Due to Electric Device Failure (Update) ML0917706352009-06-26026 June 2009 PNO-III-09-005: Davis-Besse, Transitory Alert Due to Electric Device Failure PNO-III-06-002, Security Event at Davis-Besse2006-01-23023 January 2006 PNO-III-06-002-Security Event at Davis-Besse PNO-III-04-008, Davis Besse Issued 08/04/2004 Re Automatic Reactor Shutdown2004-08-0404 August 2004 PNO-III-04-008: Davis Besse Issued 08/04/2004 Re Automatic Reactor Shutdown PNO-III-04-003, Shutdown of the Davis-Besse Nuclear Power Station Plant for Greater than 72 Hours2004-03-17017 March 2004 PNO-III-04-003: Shutdown of the Davis-Besse Nuclear Power Station Plant for Greater than 72 Hours PNO-III-03-010, Davis Besse: Fuel Loading2003-02-21021 February 2003 PNO-III-03-010, Davis Besse: Fuel Loading PNO-III-02-036, Crack Identified in Vessel Head Stainless Steel Liner2002-09-10010 September 2002 PNO-III-02-036: Crack Identified in Vessel Head Stainless Steel Liner ML0308703762002-09-10010 September 2002 Preliminary Notification of Event or Unusual Occurrence -- PNO-III-02-036 PNO-III-02-016, A; Discrete Radioactive Particles Found Outside the Radiologically Restricted Area, Davis-Besse Update2002-04-24024 April 2002 PNO-III-02-016A; Discrete Radioactive Particles Found Outside the Radiologically Restricted Area, Davis-Besse Update PNO-III-02-006, B, Davis Besse - Reactor Vessel Head Degradation (Second Update)2002-04-0505 April 2002 PNO-III-02-006B, Davis Besse - Reactor Vessel Head Degradation (Second Update) ML0235800962002-03-11011 March 2002 E-mail from PN1 to Events, Front, PN1, PN302006, Davis-Besse - Update - Significant Metal Loss Observed in Reactor Vessel Head 2018-04-04
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PRELIMINARY NOTIFICATION September 13, 2016 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE: PNO-III-16-004 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 Davis-Besse Nuclear Power Station FirstEnergy Nuclear Operating Co.
Oak Harbor, OH Docket: 50
-346 License: NPF
-3 Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency x Not Applicable
SUBJECT:
UNPLANNED SHUTDOWN OF DAVIS-BESSE NUCLEAR POWER STATION FOR GREATER THAN 72 HOURS On September 10, 2016, the Davis
-Besse Nuclear Power Station automatically shut down due to an electrical issue with the main generator. The cause of the electrical issue is still being investigated, but is believed to be water intrusion into associated electrical components due to heavy rainfall from storms passing through the area.
The main generator is used by the plant to generate electricity using steam from the nuclear reactor. If an unexpected problem occurs affecting the operation of the main generator, then the reactor is designed to automatically shutdown to prevent damage to plant components.
During the shutdown, there was also an unexpected issue with high level indication on one of the two steam generators. The steam generators are used to generate steam using hot water from the reactor which, as stated above, is used to generate electricity using the main generator. The plant operators responded to this issue and maintained steam generator level within the normal range. The cause of the high steam generator level indication is also being investigated by the plant
. The plant is currently shut down and in a stable condition. The resident inspectors responded to the event and are evaluating the licensee's investigation regarding the cause of the main generator and steam generator level issues. The NRC will review the licensee's actions before plant restart.
This preliminary notification is issued for information only and no further action by the staff is anticipated.
Ohio state officials have been informed.
The information presented herein has been discussed with the licensee, and is current as of 10:51 am EST, on September 13, 2016. ADAMS Accession Number: ML16257A203 CONTACT: Jamnes Cameron 630-829-9833 Jamnes.Cameron@nrc.gov