Answers below
Barton P. Schawe,
P.E.
Principal Reactor Engineer
Omaha Public Power
District
Tel: 402-533-7211
Greetings,
INPO will be coming to Surry Power Station in a week and
I would like to ask two questions to the group. In your response, you do
not need to reply to everyone. I will be gathering the information and putting
it into one excel file. If you would like a copy, please let me
know.
1) This question has
been asked already, but we did not get many responses. Core modeling is
performed using the CASMO-4/SIMULATE-3 computer codes. Our most recent
Reactivity Anomaly calculation(the comparison between measured and predicted
boron concentrations) gave us an uncorrected value of about 750pcm. This
is quite close to our tech spec limit of 1000pcm. If we corrected for
B-10, the anomaly value would be closer to 300pcm. Currently we use the
uncorrected value in our comparison to the predicted model. What is your
typical maximum offset between your measured and predicted Reactivity Anomaly?
Is this with or without B-10 depletion? Do you use your B-10
depletion value for the tech spec surveillance?
Response: FCS may be odd in that about 15 years ago, we developed a
HFP and HZP K-Effective bias (i.e. k-effective versus burnup) that is used
in our reload analysis and in the generation of our reactivity data in the
plant data book. This bias is validated (or changed) each cycle.
Therefore, our predicted data includes the effects of B-10 depletion. Our
uncorrected measurement is then compared ot the predicted model. We are
generally within 200 pcm for the Reactivity Anomaly.
2) This question is regarding Estimated
critical conditions/position. What is the pcm delta typically observed at
your plant between the predicted critical conditions and the actual conditions?
If a delta is observed, does the predicted critical calculation account
for B-10 depletion? At what point (i.e. >100 pcm delta) would
Operations or Reactor Engineering write a condition report?
Response: We are generally within 200 pcm for an ECC. Our
ECC process accounts for B-10 depletion. We would write a CR at >
300 pcm for trending, although not required until > 500
pcm.
Charlene Chotalal
Lead Reactor Engineer
Surry Power
Station
Work: (757)-365-2819
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