Presentation Information

3:35 PM - 3:50 PM JST(6:35 AM - 6:50 AM UTC)

[1C11]Rossi-α Type-I and Type-Ⅱ analyses for a highly-enriched subcritical core of KUCA

*Kenichiro Suga¹, Kunihiro Nakajima¹, Atsushi Sakon¹, Tadafumi Sano¹, Sin-ya Hohara¹, Cheol Ho Pyeon², Kengo Hashimoto¹ (1. Kindai Univ., 2. Kyoto Univ.)

Keywords:

KUCA,subcritical,Rossi-α,Type-I,Type-Ⅱ,prompt-neutron decay constant

For a subcritical KUCA core driven by a neutron source inherent in a highly-enriched uranium and aluminum alloy fuel, Rossi-α Type-I and Type-Ⅱ analyses are carried out to compare the performance of these analyses. Prompt-neutron decay constant obtained by Type-Ⅱ analysis is consistent with that done by Type-I analysis within a statistical error. At slightly subcritical state, the statistical error of Type-Ⅱ is much larger than the error of Type-I. A difference between the statistical errors of the two analyses decreases with an increase in subcriticality. At a most deeply subcritical state (13.6%Δk/k), the above difference has finally disappeared.

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