North Anna does not use additional measures to cool water temperatures or ambient temperatures in the Cavity. We do use light weight cooling vests to help the workers in this hot, humid environment. The vests can be re-charged with cooling medium in the field.
Barbara J. Thompson Supervisor of Exposure Control Dominion - North Anna Power Station Email: [email protected] Phone: 540-894-2605 Beeper: #3469 FAX: 540-894-2408 From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, October 12, 2010 9:25 AM To: [email protected] Cc: [email protected] Subject: Powernet: Cavity Decon Stay Times Limerick asked this question before and got no response. We are putting it out again for review. Rad Engineering is trying evaluate "out of the box" methods for increasing stay times due to heat during reactor re-assembly and cavity decon. Any information is appreciated. Limerick is a Boiling Water Reactor (BWR). Stays times for initial cavity decontamination activities during refueling outages are limited to 30 to 45 minutes due to temperatures. 1) Prior to reactor cavity drain down - What methods (other than shut down cooling) are used to control water temperature prior to drain down to reduce temperatures in the cavity post drain down? (Note: A large in-vessel inspection or repair scope may limit the use of shut down cooling.) 2) Post reactor cavity drain down - What method is used (if any) to control or reduce reactor cavity temperatures after drain down to increase stay times? (e.g., in-cavity air-conditioning, evaporative cooling fans). 3) If you don't do anything to reduce temperatures for worker stay times, please state that and why. You can respond via Powernet or contact our Rad. Engineer directly. [email protected]<mailto:[email protected]> or 610-718-2248. Thanks Linda Parlatore ************************************************** 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. ************************************************** CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
