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Report No.
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Evaluation of $$gamma$$-ray transport effect on heating distribution in a fast reactor fuel subassembly

Chiba, Go

We evaluate a $$gamma$$-ray transport effect on a heating distribution in a fast reactor fuel subassembly by $$gamma$$-ray transport calculations. We carry out calculations by using a $$gamma$$ cross section library UFGLIB.J40 based on the latest nuclear data file JENDL-4.0 and a radiation transport code system CBG which is under development at Japan Atomic Energy Agency. Numerical calculations with a Monju fuel subassembly model reveal that a heating rate in a fuel pin decreases about 1.35% by considering a $$gamma$$-ray transport. In addition, the uncertainty of this $$gamma$$-ray transport effect is estimated at 0.25%. It is also shown that a heating rate in a region inside of a wrapper tube decreases about 0.5% by considering the $$gamma$$-ray transport.

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