ML100780483

Email from Wendi Croft, Exelon to Peter Bamford, NRR Et Al. on, TMI-1 INES Report with Site Comments

ML100780483
Person / Time
Site:	Three Mile Island
Issue date:	11/23/2009
From:	Croft W Exelon Corp
To:	Peter Bamford, Chernoff H, Geoffrey Miller Plant Licensing Branch 1
References
FOIA/PA-2010-0118
Download: ML100780483 (3)

Text

Bamford, Peter From: Wendi.Croft@exeloncorp.com 6a XE*°0A Sent: Monday, November 23, 2009.5:01 PM,,

To: Bamford, Peter; edward.miller@nrc.gov; Chernoff, Harold (/ "Ž.

Cc: Pamela. Cowan@exeloncorp.com; david.helker@exeloncorp.com

Subject:

TMI-1 INES Report with Site Comments Attachments: TMI High Activity Preliminary ERF with Site Comments.doc Importance: High

Peter, Thank you for the opportunity to review the TMI High Activity ERF prior to INES submittal. In the attached document we have provided minor comments from the site.

Please let us know if you have any questions.

Thank you!

Wendi Croft Corporate Licensing Engineer Exelon Nuclear, Kennett Square Wendi.Croft~cexeloncorp.com Ph: 610-765-5726, Fax: 610-765-5807 "Success is getting what you want, and happiness is wanting what you get." - Dale Carnegie

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • This e-mail and any of its attachments may contain Exelon Corporation proprietary information, which is privileged, confidential, or subject to copyright belonging to the Exelon Corporation family of Companies. This e-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this e-mail is strictly prohibited and may be unlawful. If you have received this e-mail in error, please notify the sender immediately and permanently delete the original and any copy of this e-mail and any printout. Thank You. **************************************************

16

EVENT RATING FORM (ERF)

Event No.:

Sent Date:

THE INTERNATIONAL NUCLEAR EVENT SCALE (INES)

EVENT RADIATION RELEASE IN CONTAINMENT ASSOCIATED WITH STEAM EVENT DATE TITLE GENERATOR REMOVAL _11/21/2009 RATING RATING OUTOF DEVIATION INCIDENT ACCIDENT FACILITY TYPE PROVISIONAL X DATE SCALE 0 1 2 3 4 5 6 7 Power Reactor X Research Reactor Dl FINAL E] 11/23/2009 [] X DID 0 0 [] [] RadWaste Facility [ Radiation Source D COUNTRY FACILITY NAME / PLACE Irradiation [ Transportation D United States Three Mile Island, Unit I/Middletown, PA Fuel Fabrication Fuel Reprocessing E]

Research Facility F] Mining/Milling E]

Enrichment Other D Facility YES NO Off-site impact Release Beyond Authorised Limits X Overexposure of Members of Public D X On-Site Impact Contamination Spread X E Worker Overexposure X Damage to Radiological Barriers D X Degradation of Defence In-depth X Person Injured Physically or Casualty D X Is There a Continuing Problem X Press Release Issued (if yes, please attach) X Event Description During refueling outage activities, which included operations to replace both of the unit's steam generators, low levels of radiation activity were measured on radiation monitors installed in the reactor building. Personnel were directed to immediately leave the reactor building untilthe source of the activity could be identified. Monitoring devices at the reactor building steam generator replacement construction opening indicated a slight increase in activity. Levels have since returned to normal. No contamination was identified outside of the reactor building. Of 145 workers monitored for exposure to the radiation activity, about 19 were initially found to have exposures greater than 0.1 mSv (10 mrem), with the highest exposure estimated to be 0.38 mSv (38. mrem). No worker approached or exceeded any exposure limits. The sources of the activity are believed to be from maintenance tasks related to the removal of the plant's steam generators or ventilation line-up changes, though the exact cause of the increase.in activity levels is still unknown. The reactor was defueled at the time of the event.

Rating Justification and Difficulties Encountered (quote relevant user manual paragraphs)

This event has been given a preliminary rating of 0, "Below Scale" based on section 2.3.1 of the International Nuclear and Radiological Event Scale 2008 User's Manual (http://www-pub.iaea.org/MTCD/publications/PubDetails.asp?pubId=8120).

The justification for the rating is that no member of the public was exposed to any excess activity, and all exposures to workers were well within established statutory limits and licensee-established dose constraints. Though increasing the rating based on the number of personnel exposed is indicated for higher levels of exposure, at these levels no such increase is warranted. This event is. being submitted due to interest expressed by member states of the IAEA for the INES rating of the event.

Contact Person for Further Information This form is provided by the IAEA INES Coordinator: Rejane Spiegelberg Planer, Incident and Emergency Centre, Department of Nuclear Safety and Security, Tel: +43 (1) 2600-26074, Fax: +43 (1) 26007-26074, email: r.spiegelberp-planer(Oiaea.org.

NOTE: This form should not be used for sending infonnation to the IAEA about an actual event!

For this purpose the Nuclear Events Web-based System (http://www-news.iaea.ora) should be used instead.

EVENT RATING FORM (ERF)

Name Affiliation Dr. Cynthia Jones, Office of Nuclear Security and Incident Response U.S. Nuclear Regulatory Commission Address: Mail Stop T4-D22A, Washington, DC 20555 Phone: 301-415-0298 1Fax: 301-415-6382 eMail: cynthia.jones(onrc eov This form is provided by the IAEA INES Coordinator: ReJane Spiegelberg Planer, Incident and Emergency Centre, Department of Nuclear Safety and Security, Tel: +43 (I) 2600-26074, Fax: +43 (1) 26007-26074, email: r.spieeelberg-planer(Thiaea~or .

NOTE: This form should not be used for sending information to the IAEA about an actual event!

For this oumose the Nuclear Events Web-based System (htao://www-news.iaea.or,) should be used instead.