Adjustment of Total Delayed Neutron Yields of ^<235>U, ^<268>U and ^<239>Pu in JENDL-3.2 Using Benchmark Experiments on Effective Delayed Neutron Fraction β_<eff>

概要

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The cross section adjustment method was applied to total delayed neutron yields of 235U, 238U and 239Pu of the JENDL-3.2 file by using experimental results of effective delayed neutron fraction βeff at six cores built in two fast critical facilities of the MASURCA and FCA and a thermal critical facility of the TCA to improve these yields. The adjustment was carried out on the yields given at several incident neutron energy points in the file.After the adjustment, the yield of 238U was almost uniformly decreased by about 3% below 7 MeV. The yield of 239Pu was increased by 2.6% and that of 235U was decreased by 0.9% at the thermal energy point, while the change of yield was less than 0.3% at the other energy points for these nuclides. By using these adjusted yields, the uncertainty of calculated βeff was reduced and the agreement of βeff between experiment and calculation was improved.
社団法人日本原子力学会の論文
2002-01-25