Quick benchmark request on your calibration frequencies for your count room 
multichannel analyzers (MCAs).  North Anna is looking to change from an annual 
calibration that includes all counting geometries to a longer period of time 
between calibrations.  We would appreciate any information, lesson learned, or 
concerns on this change.


1.  What is your calibration frequency for your MCAs (annually, every 3 years, 
every 5 years, etc.)?

2.  Have you changed frequency from an annual calibration to a longer period of 
time?

3.  If so, what was your basis for changing the frequency?

4.  Has this change been effective?



Barbara J. Thompson
North Anna Power Station
1022 Haley Drive
Mineral, Va 23117
Superintendent Health Physics Technical Services
[email protected]
Phone:  540-894-2638

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