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The resonance (n,γ) reaction of Pu is one of dominant phenomena to the self-shielding effect and the reactivity controllability in plutonium fuel for high temperature gas cooled reactors (HTGRs) aiming to deep-burning. Impacts of the mitigation of the self-shielding effect and nuclear data uncertainties for the resonance (n,γ) reaction of Pu on the reactivity controllability were investigated for various fuel design using MVP code. k∞ decreased from 1.3 to 1.05 and reactivity fluctuation decreased from 30% to 6% in the proposed inert matrix fuel (IMF) design with a dilution of the TRU oxide kernel and the neutron spectrum control because of mitigation of Pu self-shielding effect at 1.056-eV.

Impacts of 240Pu self-shielding effect and uncertainties of σ(n,γ) at resonance energy on the reactivity controllability in HTGR inert matrix fuel