Responses from San Onofre. We also use DMC-2000S electronic dosimeters. Regards, Eric
1. and 2. EDs are biased up 7% to more closely match TLD data. Not really over-responding. Really a correction for slight ED geometry and energy under-response compared to TLDs. 3. Not yet. We've had these EDs in service for about 5 years and only just recently implemented zinc injection. Will be completing another TLD/ED study after the current steam generator replacement outage. Eric M. Goldin, CHP Southern California Edison <[email protected]> From: "Courtenay, Christopher C" <[email protected]> To: "[email protected]" <[email protected]> Date: 12/14/2010 11:48 AM Subject: Powernet: Electronic Dosimeter Bias Sent by: [email protected] Duke Energy would like to know the following: 1. Do you bias your EDs to over-respond in the field? 2. What bias do you apply if you do? (5%, 10%, etc) 3. Have you noticed a change in ED response due to changing plant conditions (Co58/Co60 ratio changes due to Zinc injection, etc) or specific jobs (weld overlay, alloy 600, etc)? Point of reference ? Duke uses the DMC2000S from Mirion. Chris Courtenay Engineer, Duke Energy 980-875-5005 "To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be."
