Palo Verde provides the following response: Yes. Palo Verde normally uses the MGP Instruments DMC-2000S for routine RCA entries; however, after experiencing frequent rate alarm "spikes" due to the strong EMF generated during welding we looked at what was causing the false alarms and at way to mitigate EMF/RFI interfere with our electronic dosimeters.
I performed tests with other electronic dosimeters and found that the military version of the DMC-2000S, the SOR/R is not susceptible due to the way the antenna is constructed and placed inside the dosimeter. I wrote some operating experiences on interference alarms and they are available on the INPO Nuclear Network: OE22508 - Results of Electronic Dosimeter Electro-Magnetic Interference (EMI) Testing during Welding Activities (Palo Verde) and OE14697 - DMC-2000 EPD Dose Rate Alarm Caused by Induced Oscillation from New RCA Turnstile System If you have any other questions, please feel free to call or email me. Seth. ********************************************************************** Seth J. Kanter, CHP, RPT Sr. Health Physicist Palo Verde Nuclear Generating Station Mail Sta. 7397 5801 S. Wintersburg Rd. Tonopah, AZ 85354 Phone (623) 393-3130 Fax (623) 393-2487 Unless otherwise noted, all opinions are my own Liviu Librescu ********************************************************************** From: [email protected] [mailto:[email protected]] On Behalf Of Whitener, Christopher A Sent: Thursday, September 09, 2010 7:34 AM To: [email protected] Subject: Powernet: Welding Electronic Dosimeter? Duke E nergy would appreciate any input for the following: Is anyone using an electronic dosimeter specifically for welding (special RF shielding)? Email Firewall made the following annotations --------------------------------------------------------------------- --- 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. ---------------------------------------------------------------------
