Uncertainty quantification of criticality in solid-moderated and -reflected cores at Kyoto University Critical Assembly

Pyeon, Cheol Ho; Yamanaka, Masao; Ito, Makoto; Chiba, Go; Endo, Takao; Kim, Song Hyun; Rooijen, W.F.G. van

doi:10.1080/00223131.2018.1432426

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…The experiments of reactivity measurement [1,2] were carried out in the A cores (EE1 and E3 cores in Figs. 8.1a, b, respectively) that have polyethylene moderator and reflector rods, and different fuel assemblies: "F" and "f" (Figs.…”

Section: Core Configurationmentioning

confidence: 99%

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Sensitivity and Uncertainty of Criticality

Yamanaka

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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Excess reactivity and control rod worth are generally considered important reactor physics parameters for experimentally examining the neutron characteristics of criticality in a core, and for maintaining safe operation of the reactor core in terms of neutron multiplication in the core. For excess reactivity and control rod worth at KUCA, as well as at the Fast Critical Assembly in the Japan Atomic Energy Agency, special attention is given to analyzing the uncertainty induced by nuclear data libraries based on experimental data of criticality in representative cores (EE1 and E3 cores). Also, the effect of decreasing uncertainty on the accuracy of criticality is discussed in this study. At KUCA, experimental results are accumulated by measurements of excess reactivity and control rod worth. To evaluate the accuracy of experiments for benchmarks, the uncertainty originated from modeling of the core configuration should be discussed in addition to uncertainty induced by nuclear data, since the uncertainty from modeling has a potential to cover the eigenvalue bias more than uncertainty by nuclear data. Here, to investigate the uncertainty of criticality depending on the neutron spectrum of cores, it is very useful to analyze the reactivity of a large number of measurements in typical hard (EE1) and soft (E3) spectrum cores at KUCA.

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Section: Core Configurationmentioning

confidence: 99%

“…Comparison between measured and calculated (CITATION with JENDL-4.0) results of k eff (excess reactivity: super-critical state; control rod worth: subcritical state) in EE1 and E3 cores (Ref [1]…”

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confidence: 99%

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Sensitivity and Uncertainty of Criticality

Yamanaka

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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“…Furthermore, ADS experiments with 100 MeV protons [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] obtained from the FFAG accelerator have been carried out to investigate the neutron characteristics of ADS, and the static and kinetic parameters were accurately analyzed through the measurements and the Monte Carlo simulations of reactor physics parameters, including reaction rates, neutron spectrum, subcritical multiplication factor, prompt neutron decay constants and subcriticality. Also, sensitivity and uncertainty analyses of lead (Pb) and bismuth (Bi) isotopes, which are regarded as coolant materials in actual ADS facilities, were conducted by the deterministic and the stochastic calculations by using experimental results [21][22][23][24][25] Finally, we would like to express our sincere gratitude to the authors for submitting their excellent manuscripts to the special issue of Journal of Nuclear Science and Technology. Also, we would like to sincerely thank Ms. Kumiko Kishimoto of the Atomic Energy Society of Japan for her significant efforts in the publication process of this issue.…”

Section: Overviewmentioning

confidence: 99%

Special issue on accelerator-driven system benchmarks at Kyoto University Critical Assembly

Pyeon

Talamo

Fukushima

2020

Journal of Nuclear Science and Technology

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The accelerator-driven system (ADS) had been proposed for producing energy and transmuting minor actinide and long-lived fission products. ADS has attracted worldwide attention in recent years because of its superior safety characteristics and potential for burning plutonium and nuclear waste. At the Institute for Integrated Radiation and Nuclear Science, Kyoto University, a series of ADS experiments with 14 MeV neutrons was launched in fiscal year 2003 at the Kyoto University Critical Assembly (KUCA). Also, the high-energy neutrons generated by the interaction of 100 MeV protons with tungsten target was injected into the KUCA core on March 2009. The ADS experiments with 100 MeV protons obtained from the FFAG accelerator have been carried out to investigate the neutron characteristics of ADS. This special issue aims at concentrating on experimental analyses for the ADS benchmarks at KUCA on the basis of most recent advances in the development of computational methods, and contributing to academic progress for ADS research field in the future.

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