Fermi - similar experiences with dropped dosimeters as described by Seth. Fermi practice, if dosimeter is dropped, exit area and read dosimeter.
Benjy Bertossi Fermi2 - RP Supervisor 734-586-4935 [email protected] From: <[email protected]> To: <[email protected]> Date: 04/26/2012 11:02 AM Subject: Powernet: RE: Dropped ED registering faulty dose rates Sent by: [email protected] Zach, I think that you find that other users have experiences a false rate due to mechanical shock i.e., dropping the dosimeter. As rugged as the dosimeter is, it is not 100% shock proof. Your alarm response program should evaluate both the potential for an alarm to have been caused by shock as well as actually radiation. Older dosimeters can experience this condition more frequently because they have had more time to be used / dropped by workers. Dropping a dosimeter can damage sensitive electronics or jar the battery connections momentarily inducing an alarm.. OE16937 - Dose Rate Alarms On MGP DMC 2000 S Due To Mechanical Shock OE11382 - Electro-Magnetic Interference Problem with the Merlin Gerin DMC-2000 OE14697 - DMC-2000 EPD Dose Rate Alarm Caused by Induced Oscillation from New RCA Turnstile System Seth ********************************************************************** Seth J. Kanter, CHP, RRPT Sr. Health Physicist Palo Verde Nuclear Generating Station Mail Sta. 7397 5801 S. Wintersburg Rd. Tonopah, AZ 85354 Phone (623) 393-3130 Cell (602) 376-7131 or (602) 402-5764 Fax (623) 393-1853 Unless otherwise noted, all opinions are my own Liviu Librescu ********************************************************************** -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of BRAJUHA Zach(ZR) - BRUCE POWER Sent: Thursday, April 26, 2012 7:36 AM To: [email protected] Subject: Powernet: Dropped ED registering faulty dose rates Good morning, We have recently started using DMC2000S electronic dosimeters and have received several reports in the field of dose rate alarms after the device has has been dropped. We are currently working with the vendor to analyze the specific dosimeters in questions, but I'm wondering if anyone else in the industry has experienced this problem. I would like to know if this issue is specific to some of the dosimeters we have received, or if this has affected other plants? Any information is greatly appreciated. Thanks, Zach Brajuha RP FLM (Acting) Bruce Power (519) 361-2673 ext. 12851 ----------------------------------- Powernet - a service of the Health Physics Society Power Reactor Section Powernet archives at http://www.mail-archive.com/[email protected]/ Reply to: [email protected] If Questions, contact Mike Russell, CHP at [email protected] --- 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. ----------------------------------- Powernet - a service of the Health Physics Society Power Reactor Section Powernet archives at http://www.mail-archive.com/[email protected]/ Reply to: [email protected] If Questions, contact Mike Russell, CHP at [email protected]
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