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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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April 24, 2002 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-III-02-016A 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 III staff on this date.
Facility Licensee Emergency Classification Davis-Besse Nuclear Power Plant Notification of Unusual Event FirstEnergy Corporation Alert Oak Harbor, Ohio Site Area Emergency Docket: 50-346 General Emergency x Not Applicable
SUBJECT:
DISCRETE RADIOACTIVE PARTICLES FOUND OUTSIDE THE RADIOLOGICALLY RESTRICTED AREA (UPDATE)
DESCRIPTION:
On March 22, 2002, radiation protection personnel at the Davis-Besse Nuclear Power Plant were notified by the Oconee Nuclear Power Station that discrete radioactive particles had been found on the clothing of a worker who was undergoing in-processing prior to beginning work at the plant. The worker had most recently worked at Davis-Besse.
The licensees investigation subsequently was expanded to seven individuals who had worked at Davis-Besse performing steam generator work during the current outage. Surveys were conducted by and for the licensee in Florida, Georgia, Virginia, North Carolina, and Texas, as well as several locations in the vicinity of the Davis-Besse plant. These surveys included the clothing, residences, hotel rooms, and vehicles used by the seven individuals.
A total of approximately 18 items have been found during these surveys which contained radioactive particles. Thirteen particles were reported in Preliminary Notification III-02-016, issued April 16, including two particles found onsite and eleven found offsite. Five additional items were found during subsequent surveys that contained radioactive particles.
The particles are generally of fuel origin, containing niobium, zirconium, ruthenium, and cerium, although several particles contained corrosion or activation products like cobalt-60.
Workers at the Davis-Besse plant who have suspected intakes of radioactive material are routinely checked with a whole body counter to measure any possible uptake. The plant staff determined that the whole body counter had not been programmed to identify the predominant fission products that made up the particles - those originating in the fuel - but only to identify corrosion or activation products and certain fission products from the measurements. As a result, many fuel-related isotopes would not have been reported by the whole body counter.
The licensee reanalyzed the whole body counter data for the seven individuals to search for fission products and found evidence of fission products, which the more limited earlier analysis did not show. Although it appears that the seven individuals are the only ones with possible fuel-related contamination, the licensee is evaluating other individuals as well.
All of the particles found were small - ranging from 2 to 80 nanocuries. The licensees dose calculations indicate that the particles found would not represent a health threat to the workers or to the general public.
On April 18, NRC Region III (Chicago) began a special inspection of the circumstances surrounding the particles found offsite. State of Ohio personnel have accompanied the NRC inspectors. The inspectors monitored the licensees offsite surveys in the Davis-Besse area and performed independent surveys as well. The inspection is continuing with emphasis on the causes of the radioactive particles being found offsite. The review includes the licensees procedures and equipment for measuring contamination, and the practices used in surveying individuals and their clothing.
The State of Ohio will be informed of this updated information. The information in this preliminary notification has been reviewed with licensee management.
This information is current as of 10 a.m. on April 24, 2002.
CONTACTS:
John House Steven Orth 630/829-9824 630/829-9827