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MONTHYEARML23159A1652023-05-11011 May 2023 TMI-2 Pol Am. 67 and SER Minor Discrepancies ML22194A9072022-07-13013 July 2022 NAC-MAGNASTOR Amd. 13 - TMI-2 Fbm (22A) Packing Slip ML20279A3722020-11-23023 November 2020 TMI-2 LTA Notice of Significant Licensing Action RS-20-140, Proposed Changes to Decommissioning Trust Agreements2020-10-30030 October 2020 Proposed Changes to Decommissioning Trust Agreements ML20008D2232020-01-0808 January 2020 NRC Region I Twitter Feeds 10-1 to 12-31-2019 ML17143A0152017-05-23023 May 2017 Attendance List on 04/20/17 ML16090A2852016-03-23023 March 2016 Aam March 23 2016 Signin Sheet ML15162A0842015-06-11011 June 2015 GTCC Disposals at the Barnwell Low-Level Radioactive Waste Facility from 1998 to Present ML15099A4562015-04-0707 April 2015 Annual Assessment Meeting - Attendance List, April 7, 2015 ML15071A1192015-03-0202 March 2015 Attachment 1 - Response to the Request for Additional Information - License Amendment Request to Adopt Emergency Action Level Schemes Pursuant to NEI 99-01, Revision 6, Development of Emergency Action Levels for Non-Passive Reactors RA-15-019, Attachment 1 - Response to the Request for Additional Information - License Amendment Request to Adopt Emergency Action Level Schemes Pursuant to NEI 99-01, Revision 6, Development of Emergency Action Levels for Non-Passive Reactors2015-03-0202 March 2015 Attachment 1 - Response to the Request for Additional Information - License Amendment Request to Adopt Emergency Action Level Schemes Pursuant to NEI 99-01, Revision 6, Development of Emergency Action Levels for Non-Passive Reactors ML14113A3352014-04-17017 April 2014 April 17, 2014 Aam Signin Sheet ML13262A1112012-09-20020 September 2012 Enclosure 6 - Mary Stamos Presentation ML12263A3092012-09-13013 September 2012 TMI Alert Presentation Notes Sept 13 2012 NUREG-0654 Public Mtg ML1117502192011-06-22022 June 2011 NRC Inspection Findings Related to Closed Cooling Water Systems (1/1/2004 to 6/22/2011) ML1115902162011-06-0707 June 2011 TMI Annual Assessment Meeting Attendance List, June 7, 2011 ML1111006452011-04-20020 April 2011 Gpu Nuclear, TMI 2 Special Orders and Agreements ML1015505362010-05-26026 May 2010 ECR Tm 06-00816 Rev 1, Attachment 1, Containment Structural Opening ML1015505482010-05-26026 May 2010 Workers Restricted from RCA & Whole Body Counts ML1015505472010-05-26026 May 2010 Workers Restricted from RCA & Whole Body Counts ML1015505372010-05-26026 May 2010 IR 1000819 - Condition Description ML1015505442010-05-26026 May 2010 Workers Restricted from RCA & Whole Body Counts ML1014105492010-05-21021 May 2010 TMI Sign-in Sheet, Aam, April 13, 2010 ML1012300732010-04-19019 April 2010 Response to Questions from Chairman Klein'S Office ML1015505392010-01-28028 January 2010 Assignment Report (AR) 01000819 Report ML1015505452009-12-14014 December 2009 Follow-up Personnel Contamination Monitoring ML1015505292009-12-0101 December 2009 Assignment Report (AR) 00999752 Report ML1015505322009-11-27027 November 2009 TMI-I Standing Order Rev. 2 ML1015505382009-11-24024 November 2009 Attachment 2, Event/Issues Report Format, Human Performance Issue Verbal Report Format (TMI-1) ML1015505352009-11-24024 November 2009 Reportable Event Plant Specific: TMI-02 ML1012304772009-11-23023 November 2009 Chairman'S Talking Points, TMI Airborne Contamination Event Inside Containment ML1015505312009-11-23023 November 2009 Attachment 2, Event/Issues Report Format, Human Performance Issue Verbal Format (TMI-1) ML1007604742009-11-22022 November 2009 TMI Help Team Report Regarding RB Contamination Issue ML1015505332009-11-22022 November 2009 Low Level Airborne Radioactivity in Reactor Building - Draft ML1015505402009-11-21021 November 2009 Assignment Report (AR) 00996823 Report ML1015505422009-11-21021 November 2009 Assignment Report (AR) 00996823 Report ML1007604702009-11-0202 November 2009 News Flash, Update to Employees on RB Contamination Issue on 11/21/09 from Exelon Nuclear ML0908404622009-03-0303 March 2009 Comment from M. 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0 Chairman's Talking Points Ai123209415P TMI Airborne Contamination Event inside n t
- At about 4:00 p.m., on November 21, while shutdown for a refueling outage and steam generator (SG) replacement, TMI experienced alarms inside the containment due to high airborne contamination levels.
- As a precaution in response to the alarms, approximately 150 workers exited the containment. Several workers alarmed the portal monitors due to contamination levels, and were whole body counted to assess their dose. Of these workers, approximately 12 workers received doses ranging from 10 mrem to about 40 mrem, which was a very small fraction of the annual federal occupational exposure limit (5000 mrem/yr). It is not unusual for contamination events to occur during refueling outages and workers would be processed as they were in this event.
- Exelon has attributed the cause of the contamination event to a change in air pressure inside the containment building that dislodged small irradiated particles in piping systems.
Some of these particles became airborne and were detected by containment air monitors.
One airborne monitor near the containment construction opening did show a short duration increase in activity; however, the licensee esimates that this released activity was less than 1% (0.04 mrem) of the quarterly Offsite Dose Calculation Model (ODCM) limit (7.5 mrem).
The licensee surveyed the rea. around the containment construction opening and did not detect any contamination i the areas that were surveyed.
- The airborne contamination returned to pre-event levels 4 to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after the initial alarms.
This event drew a significant amount of media attention, as well as attention from other federal agencies and the State of Pennsylvania. A number of Region I personnel and Headquarters personnel responded to this event over the weekend. The Resident Inspectors, Division of Reactor Safety Inspectors, and the Public Affairs Officer responded to the site to investigate the event and to address media inquires. In addition, representatives from Region I Senior Management, Division of Reactor Projects Branch 6, State Liaison Officers, and Public Affairs responded to the Regional Office to coordinyte-ur understandiýg of the event and outreach activities. Exelon has issue* twV ress releases and the R is in the process of issuing a press release on the event.-
- There was no affect on public health and safety as a result of this event. This event did not result in the licensee exceeding any emergency action levels, nor were any formal event notification criteria met. The workers that were affected by this event received doses that were a small percentage of the annual occupational exposure limit. Region I is continuing to followt-fe licensee's evaluations for this event.
- There is a potential concern from the State of Pennsylvania about the timeliness of the licensee's notification to the State for this event. Exelon informed the NRC Resident Inspector at about 5:30 pm on November 21 that a prompt investigation was underway for radiological conditions inside the reactor building that required personnel to be removed as a precautionary measure. No additional details &eerovoded at the time. As additional details became available, further notifications were made including informing the State at about 9:30pm and updating the NRC at about 9:45pm. Exelon submitted an event report (50.72) at 1:13 am on November 22 based on significant public interest.