David, Palo Verde experienced similar elevated probe pusher dose rates and increased contamination levels on S/G eddy current filtration units. As with Cook, we tried other methods such as the River Technology HEPA filter system. We determined that as the probes traverse through the tubes they wear in such a manner as to create very fine particulates. These wear products combine with the high levels of contamination inside the tubes and produce elevated dose rates and contamination levels. One of our technically savvy Decon staff members designed a water impingement unit (patent pending) that is very effective at removing this combination of material. When the activity in the unit's water tank builds up we drain it directly to the liquid radwaste system and process it through normal plant systems. This has helped us reduce the number of highly radioactive filters that we have had to deal with.
Seth From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, November 02, 2011 7:05 AM To: [email protected] Subject: Powernet: All, Is anyone using the MIZ-80 probe from Areva during S/G Eddy Current testing and experiencing radiological issues such as elevated dose rates at probe pusher, increased contamination/dose rate levels on filtration units and airborne issues? I would appreciate a response as soon as possible. A phone call would be even better as this is an issue that needs immediate attention. Thanks to all for immediate considerations. Harry L Miller Exelon Nuclear Braidwood Station 815-417-2713 [email protected] ************************************************** 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. ************************************************** --- NOTICE --- This message is for the designated recipient only and may contain confidential, privileged or proprietary information. If you have received it in error, please notify the sender immediately and delete the original and any copy or printout. Unintended recipients are prohibited from making any other use of this e-mail. Although we have taken reasonable precautions to ensure no viruses are present in this e-mail, we accept no liability for any loss or damage arising from the use of this e-mail or attachments, or for any delay or errors or omissions in the contents which result from e-mail transmission.
