Experimental analyses of bismuth sample reactivity worth at Kyoto University Critical Assembly |
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Authors: | Cheol Ho Pyeon Masao Yamanaka Akito Oizumi Masahiro Fukushima Kazufumi Tsujimoto |
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Affiliation: | 1. Division of Nuclear Engineering Science, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japanpyeon@rri.kyoto-u.ac.jp;3. Division of Nuclear Engineering Science, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japan;4. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan |
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Abstract: | Sample reactivity worth experiments are carried out by substituting aluminum (Al) plates for bismuth (Bi) ones at the Kyoto University Critical Assembly. At the beginning, uncertainty quantification of bismuth isotope is conducted by deterministic calculations with nuclear data library JENDL-4.0, with the use of experimental results of sample reactivity worth. Then, with the combined use of current (Bi) and previous (Pb) experimental results that demonstrate the comparative difference in the sensitivity and uncertainty of Bi and Pb isotopes, experimental results of cross-section uncertainties of Bi isotope are available for examination of neutron characteristics of Pb–Bi coolant material in the accelerator-driven system. From the experimental analyses, further uncertainty analyses by neutron transport calculations are needed for several reactions of Bi isotope, especially with the use of the covariance data of capture, elastic scattering and inelastic scattering reactions in another nuclear data library. |
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Keywords: | KUCA Bi sample reactivity worth criticality sensitivity uncertainty JENDL-4.0 covariance data |
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