Scott, North Anna uses a neutron correction factor based on the neutron energy spectrum at our site. We previously used a correction factor of 0.5 for low energy and 1.0 for high energy applications. After extensive testing utilizing REM-500s, TLDs, and DMC-2000GNs we have gone back to a correction factor of 1.0. We do not include a bias (similar to the 15% bias we add to the DMC-2000S) with our neutron dosimeters.
Overall, we see up to a +25% bias between our neutron DAD and TLD readings. We do calibrate the DMC-2000GNs on site with an AmBe source. Give me a call if you have any questions. Barbara Thompson Supervisor of Exposure Control Dominion - North Anna Power Station Email: [email protected]<mailto:[email protected]> Phone: 540-894-2605 Beeper: #3469 From: [email protected] [mailto:[email protected]] On Behalf Of Huneycutt, Scott Sent: Wednesday, June 29, 2011 4:53 PM To: '[email protected]' Cc: Huneycutt, Scott Subject: Powernet: Neutron ED bias Sorry to repeat a query from someone else, but I cannot find my thread of responses. Concerning MGP 2000GN EDs: What do you use for a bias on neutron calibration? (+10%, +20%, +40%, etc...) Does your bias incorporate or is in addition to a 30% bias for those calibrated by MGP (calibration in France)? Do you have different bias for different areas? (DryWell, ISFSI, etc) Thank you, Scott Huneycutt Xcel Energy | Responsible By Nature Senior Health Physicist Monticello Nuclear Generating Plant 2807 West County Road 75, Monticello, MN 55362 P: 763.295.1380 F: 763.295.1225 E: [email protected]<mailto:[email protected]> ________________________________________________ XCELENERGY.COM<http://www.xcelenergy.com/> Please consider the environment before printing this email CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and/or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
