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Measurement of MA reaction rates under sub-critical condition with spallation neutron source in A-core of KUCA for ADS

Oizumi, Akito  ; Fukushima, Masahiro ; Tsujimoto, Kazufumi ; Chiba, Go*; Yamanaka, Masao*; Sano, Tadafumi*; Pyeon, C. H.*

In the nuclear transmutation system such as ADS, the nuclear data validation of MA is required to reduce the uncertainty caused by the nuclear data of MA. This study aims to measure the fission reaction rate ratios (FRRs) of Neptunium-237 ($$^{237}$$Np) or Americium-241 ($$^{241}$$Am) to Uranium-235 ($$^{235}$$U) by using a back-to-back (BTB) fission chamber in the KUCA built as a sub-critical core (k$$_{rm eff}$$ = 0.998) with the nuclear spallation neutron source. The result showed that the measured FRRs of $$^{237}$$Np/$$^{235}$$U and $$^{241}$$Am/$$^{235}$$U were 0.014 $$pm$$0.002 and 0.023 $$pm$$0.005, respectively. These measured values will be used for verification of evaluated nuclear data by conducting detailed analyses.

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