North Anna's reply: The WBC calibrations are performed annually in house and are reviewed by the RP specialist and supervision. Daily QC checks are performed with a mixed Ba-133/Cs-137/Co-60 source when the WBC is in service. Pass/fail results are automatically printed out. We also participate in the Eckert & Ziegler Analytics annual confirmatory program where we receive a source of unknown activity and an unknown radionuclide mixture. The blind source is counted in our phantom, results reported to Analytics, and our pass/fail agreement is reported back to us.
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 From: [email protected] [mailto:[email protected]] On Behalf Of ROSSER, FREDERICK W Sent: Monday, August 30, 2010 3:46 PM To: [email protected] Subject: Powernet: QA of WBC calibration We were recently asked how we perform a QA of our WBC calibration. We use a vendor to perform the calibration and the documentation is complete and has never been challenged, so I was stumped. We do QC checks on the daily performance to document the daily performance vs. the cal. What do you do for WBC calibration QA reviews? Especially if you use a vendor to perform the calibration. Fred W. Rosser R. P. Supervisor Grand Gulf Nuclear Station 601 437-6571 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.
