Fort Calhoun tracks & reports electronic dosimeter (DMC-2000S) to the nearest 0.1 mrem, a deliberate decision when we switched to the DMC-2000S :). The primary driver was better alignment with our record dosimeters. We had & have a number of workers with high numbers of entries <= 0.4 mrem that were reported as zero with our old system. Under our previous system, the dosimeters displayed to 0.1 mrem, but recorded to 1 mrem - a limitation of the HIS20 version we were running at the time.
One improved worker performance was eliminating the impact of workers exiting the RCA at 0.4 mrem and getting zero recorded & trended on daily dose reports. This lead to a false sense of dose saving and large deltas between electronic & record dosimeters. David Brehm Fort Calhoun Nuclear Station Supervisor - Radiological Equipment & Dosimetry Office: 402.533.7582 Cellular: 402.214.0107 Pager: 402.561.3310 From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, December 20, 2011 12:55 PM To: [email protected] Subject: Powernet: Tracking electronic dosimeter dose to tenths? San Onofre currently tracks electronic dosimeter dose to integer mrem (a deliberate decision when we implemented the MGPI DMC-2000S dosimeters). We understand that some plants track dose to tenths of an mrem. Reportedly, there is an ALARA benefit for this additional precision. I have two questions: How many plants/fleets are tracking ED dose to tenths of a mrem? How does such precision impact ALARA performance? In other words, what worker behaviors change when a worker sees 4.4 mrem instead of 4, or 4.7 mrem instead of 5? Thanks and Happy Holidays from sunny (today) California, Eric Eric M. Goldin, CHP Southern California Edison <[email protected]<mailto:[email protected]>> ----------------------------------- 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]<mailto:[email protected]> If Questions, contact Mike Russell, CHP at [email protected]<mailto:[email protected]> ---------------------------------------------------------------------- This e-mail contains Omaha Public Power District's confidential and proprietary information and is for use only by the intended recipient. Unless explicitly stated otherwise, this e-mail is not a contract offer, amendment, or acceptance. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.
