Reaction rate analyses of accelerator-driven system experiments with 100 MeV protons at Kyoto University Critical Assembly

Pyeon, Cheol Ho; Vu, Thanh Mai; Yamanaka, Masao; Sugawara, Takanori; Iwamoto, Hiroki; Nishihara, Kenji; Kim, Song Hyun; Takahashi, Yoshiyuki; Nakajima, Kunihisa; Tsujimoto, Kazufumi

doi:10.1080/00223131.2017.1389314

Cited by 18 publications

(4 citation statements)

References 32 publications

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“…Starting from the reference core ( Fig. A2.11) that reached a criticality, reaction rate experiments [9] (Cases II-1 to II-4 in Fig. 2A.16) in ADS were carried out in the KUCA A-core by varying subcriticality ranging from 2,483 to 11,556 pcm, as shown in Figs.…”

Section: Core Configurationmentioning

confidence: 99%

“…To monitor the size of the proton beam spot, the Gafchromic film, which is highly sensitive to charged particles, was attached to the surface of the stainless steel flange before setting the Pb-Bi target. Among the main characteristics of the protons, the proton beam shape [23] was considered essential for determining neutron multiplication [3,9] in the subcritical core, and for demonstrating adequate numerical precision of Monte Carlo calculations. The 115 In(n, n ) 115m In reaction rates of high-energy neutrons generated at the location of the Pb-Bi target were used for the monitoring of the source neutrons, showing the threshold energy as 0.3 MeV (Table 5. 12).…”

Section: Experimental Settingsmentioning

confidence: 99%

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Neutron Spectrum

Pyeon

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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The subcritical multiplication factor is considered an important index for recognizing, in the core, the number of fission neutrons induced by an external neutron source. In this study, the influences of different external neutron sources on core characteristics are carefully monitored. Here, the high-energy neutrons generated by the neutron yield at the location of the target are attained by the injection of 100 MeV protons onto these targets. In actual ADS cores, liquid Pb–Bi has been selected as a material for the target that generates spallation neutrons and for the coolant in fast neutron spectrum cores. The neutron spectrum information is acquired by the foil activation method in the 235U-fueled and Pb–Bi-zoned fuel region of the core, modeling the Pb–Bi coolant core locally around the central region. The neutron spectrum is considered an important parameter for recognizing information on neutron energy at the target. Also, the neutron spectrum evaluated by reliable methodologies could contribute to the accurate prediction of reactor physics parameters in the core through numerical simulations of desired precision. In the present chapter, experimental analyses of high-energy neutrons over 20 MeV are conducted after adequate preparation of experimental settings.

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Section: Core Configurationmentioning

confidence: 99%

Section: Experimental Settingsmentioning

confidence: 99%

Neutron Spectrum

Pyeon

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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“…The experimental studies on ADS have been conducted for nuclear transmutation analyses with the combined use of KUCA and the FFAG accelerator. 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.…”

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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“…Integral data to evaluate coolant materials for ADS were measured: sample reactivity worth of lead [19] and bismuth [20] at the Kyoto University Critical Assembly (KUCA), and lead void reactivity worth at the Nevada National Security Site [21]. At KUCA, online subcriticality monitoring system [22] was developed, and effective delayed neutron fractions [23] and reaction rates [24] were measured with spallation neutrons generated by the combined use of 100 MeV protons and a lead-bismuth target. On 14th and 15 February 2019, the first significant attempt was made to demonstrate the principle of nuclear transmutation of minor actinides (MAs) by ADS through the injection of high-energy neutrons into the KUCA core at a subcritical state [25].…”

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confidence: 99%

Recent activities in the field of reactor physics

Fukushima

Tojo²

2019

Journal of Nuclear Science and Technology

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Reactor Physics that treat the essentials of how fission nuclear reactors work fundamentally has played important roles in safe operations and design studies of various types of nuclear reactors. From the latest activities in the field of reactor physics, this report summarizes some outstanding researches and developments published in scientific journals, including the Journal of Nuclear Science and Technology and others.

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Reaction rate analyses of accelerator-driven system experiments with 100 MeV protons at Kyoto University Critical Assembly

Cited by 18 publications

References 32 publications

Neutron Spectrum

Neutron Spectrum

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

Recent activities in the field of reactor physics

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