Benchmark Watts Bar and DC Cook for 0.1 mrem ALARA estimating. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Barber, Jerry Sent: Tuesday, December 28, 2010 11:17 AM To: '[email protected]' Subject: Powernet: RE: Electronic Dosimeter Bias - "Rounding"
Thanks for your response Barbara. Do you have any reports (directly from WACs??) that give you dose to 0.1 mrem? Our relatively new RPM from Entergy says that many plants are improving the focus on ALARA by tracking work to this resolution. It makes sense to me, but I haven't ran across many other plants doing it. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of BJ Thompson Sent: Friday, December 24, 2010 8:43 AM To: [email protected] Subject: Powernet: RE: Electronic Dosimeter Bias - "Rounding" Jerry, North Anna's WACS system does round ED dose and the rounded value is entered in the exposure management software. 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 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Barber, Jerry Sent: Thursday, December 16, 2010 8:57 AM To: '[email protected]' Subject: Powernet: Electronic Dosimeter Bias - "Rounding" In addition to June Scott's excellent follow up questions I would also like to ask the following - Do any other facilities round EAD data before bringing it over into their Official dose tracking/reporting database? The version of Passport Total Exposure that we use as our Official dose tracking/reporting database currently does not accept decimal data. Our interface software (WACs) has been configured to round EAD dose as follows: EAD reading Value Input into Database 0 - 0.4 0 0.5 - 1.4 1 1.4 - 2.4 2 ........and so on................. Question: Does your facility round EAD data in a similar fashion before input into your Official dose tracking/reporting system? Thanks to all of you who help make Powernet such a valuable Benchmarking tool (Merry Christmas and Happy New Year!!!) Jerry Barber Lead RC Specialist H.B. Robinson Nuclear Plant 843-857-1496 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, December 15, 2010 3:28 PM To: [email protected] Subject: Re: Powernet: Electronic Dosimeter Bias Is this bias 7% the difference between TLD and EAD collective and individual dose after a read period? or is it the correction factor set on the calibrator compared to Cs-137 source? Do you irradiate on a phantom? or a box calibrator? or with a MG robot calibrator setup? How is your transfer cal performed? We have a over all bias factor after TLD reads of 7 to 8% with the EAD being high. To reach this we need to set the Cs-137 robot calibrator to 1.18 correction factor. This has been cross checked on a NVLAP phantom in open air geometry. I'd like to ensure we are comparing the same criteria. June L. Scott [email protected] Phone: 419-321-8555 Cell: 419-367-6651 Davis Besse Nuclear Power Station 5501 N State Route 2 Oak Harbor, Oh 43449 [email protected] om Sent by: To owner-power...@hp [email protected] s1.org cc Subject 12/15/2010 10:43 Re: Powernet: Electronic Dosimeter AM Bias Please respond to [email protected] 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. 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