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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-III-22-001, Dresden Nuclear Power Station, Unit 3, Unplanned Shutdown Greater than 72 Hours and Notice of Unusual Event for a Fire Affecting the Main Power Transformer2021-10-19019 October 2021
PNO-III-22-001 Dresden Nuclear Power Station, Unit 3, Unplanned Shutdown Greater than 72 Hours and Notice of Unusual Event for a Fire Affecting the Main Power Transformer
PNO-III-15-002, Dresden Unit 2 Shutdown2015-02-11011 February 2015
PNO-III-15-002 Dresden Unit 2 Shutdown
PNO-III-14-006, Dresden, Unit 2 and Unit 3, Report of Tritium at Dresden Sewage Treatment Plant2014-06-11011 June 2014
PNO-III-14-006, Dresden, Unit 2 and Unit 3, Report of Tritium at Dresden Sewage Treatment Plant
ML14120A1602014-04-29029 April 2014
Update to Dresden, Unit 2, Shutdown Due to Main Transformer Damage
PNO-III-14-005, Dresden Unit 2 Shutdown Due to Main Transformer Damage2014-04-15015 April 2014
PNO-III-14-005 Dresden Unit 2 Shutdown Due to Main Transformer Damage
PNO-III-12-010, A - Update-Unplanned Shutdown Greater than 72 Hours on August 30, 2012, Due to Circulating Water System Vacuum Vent Line Failure2012-09-0707 September 2012
PNO-III-12-010A - Update-Unplanned Shutdown Greater than 72 Hours on August 30, 2012, Due to Circulating Water System Vacuum Vent Line Failure
ML12248A3962012-09-0404 September 2012
PNO-III-12-010 - Unplanned Shutdown Greater than 72 Hours on August 30, 2012, Due to Circulating Water System Vacuum Vent Line Failure
PNO-III-09-004, Dresden Tritium Leakage2009-06-10010 June 2009
PNO-III-09-004: Dresden Tritium Leakage
ML0604602112006-02-15015 February 2006
PNO-III-06-004, Tritium Leakage
PNO-III-05-012, Dresden: Shutdown Expected to Be Greater than 72 Hours to Replace the Unit 2 Main Transformer2005-09-0101 September 2005
PNO-III-05-012, Dresden: Shutdown Expected to Be Greater than 72 Hours to Replace the Unit 2 Main Transformer
PNO-III-02-030, Granting of Notice of Enforcement Discretion (NOED) to 54 Licensed Operators for Failure to Take a Comprehensive Requalification Written Examination2002-07-0505 July 2002
PNO-III-02-030 - Granting of Notice of Enforcement Discretion (NOED) to 54 Licensed Operators for Failure to Take a Comprehensive Requalification Written Examination
ML17252A9231974-02-21021 February 1974
Notification of an Explosion in the Off-Gas System on 02/20/1974 at Dresden Unit 3
2021-10-19
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PRELIMINARY NOTIFICATION-REGION III April 29, 2014 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE-PNO-III-14-005A 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 Licensee Emergency Classification Dresden Unit 2 Notification of Unusual Event Exelon Generation Company Alert Morris, IL Site Area Emergency Docket: 50-237 General Emergency License: DPR-19 X Not Applicable
Subject:
UPDATE TO DRESDEN UNIT 2 SHUTDOWN DUE TO MAIN TRANSFORMER DAMAGE This Preliminary Notification provides an update to PNO-III-14-005, which addressed an April 12, 2014, shutdown when the Main Transformer sudden pressure relays actuated resulting in a generator trip and reactor trip. The main transformer takes electricity from the generator and sends it to the switchyard.
The licensee replaced the Unit 2 Main Transformer with a spare which was on site, performed testing and then restarted the unit. The licensee restarted the reactor on Saturday, April 26, 2014 and the generator was placed on the grid on April 28, 2014. NRC Resident Inspectors observed the licensees response to the plant transient and restarting activities.
This preliminary notification is issued for information only and no further action by the staff is anticipated.
Region III received initial notification of this occurrence by the NRC Resident Inspectors. The information presented herein has been discussed with the licensee, and is current as of 1:00 p.m. (CDT) on April 29, 2014.
The State of Illinois has been informed.
ADAMS Accession Number: ML14120A160 Contacts: Bruce L. Bartlett 630-829-9754 Bruce.Bartlett@nrc.gov
