Braidwood would like to benchmark the industry with the following questions
relating to personnel contamination monitor (PCM) alarm setpoints and
difficult-to-detect isotopes.
1. What is your beta alarm setpoint for personnel contamination monitors
at your RCA egresses?
2. Does your alarm setpoint take into consideration, the presence of
difficult-to-detects in your plant mix?
a. If yes, how or what methodology did you used to arrive at your
new beta alarm setpoint?
3. How did you characterize your plant mix smear(s) in preparation for the
INPO performance evaluation with regard to difficult-to-detect isotopes?
a. For example:
* If your beta alarm setpoint was reduced to 3,750 dpm/100 cm2 due to
the presence of difficult-to-detect isotopes (25% of waste stream), then at
what strength did you make your INPO performance evaluation smear(s)?
o For example: Did you make your smear(s) equal to 3,750 dpm/100 cm2
(reduced 25% due to difficult-to-detect isotopes) or did you make your smear(s)
at 5,000 dpm/100 cm2?
* Did you use a GM to characterize the strength of your beta smear? If
not, then what instrument did you use to ensure the strength of your smear is
at ±20% of your alarm setpoint?
4. Lastly, what beta model PCM does your station use at your main RCA
egress?
Thank you very much for your time.
Exelon Nuclear
Hieu T. Nguyen
RP Technical
Work:(815) 417-2731
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