Effective delayed neutron fraction by Rossi-α method in accelerator-driven system experiments with 100 MeV protons at kyoto university critical assembly

Yamanaka, Masao; Pyeon, Cheol Ho; Kim, Song Hyun; Shiga, Hiroshi; Kitamura, Yasunori; Misawa, Tsuyoshi

doi:10.1080/00223131.2016.1274686

Cited by 6 publications

(8 citation statements)

References 19 publications

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“…The A-core was used for the measurement of β eff in the ADS experiments with 100 MeV protons [12]. The core comprised 25 fuel rods surrounded by polyethylene reflectors as shown in Time evolution according to the injection of spallation neutrons was obtained from the signals of a BF 3 detector installed diagonally to the target at position (10, U; Fig.…”

Section: Ads Experimentsmentioning

confidence: 99%

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Effective Delayed Neutron Fraction

Yamanaka

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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In kinetic analyses on ADS, although adjoint flux distribution is defined under the existence of an external neutron source, an issue of the proper determination of the weighting function still remains in the definition to obtain the kinetics parameters in the fixed-source calculations. Here, an alternative methodology is proposed with the combined use of the k-ratio method and the reaction rates obtained by the fixed-source calculations, when the subcriticality level or the spectrum of the external neutron source is varied. In ADS experiments, the measurement of βeff is expected to provide complementary verification of the calculation and reliability of nuclear data. Then, the formulation of the Rossi-α method in the pulsed-neutron source has been already available for application to the subcriticality measurement in the pulsed-neutron source (PNS) experiments. Accordingly, the methodology is applied uniquely to deduce the βeff value with the pulsed-neutron source (spallation neutrons), with the combined use of the results of experiments and calculations. Using parameters α and ρ$, the values of βeff/Λ are deduced at near-critical configurations through experimental analyses. To estimate the numerical precision of Λ, the value of βeff/Λ is used as an index of Λ evaluation that is defined by a ratio of Λ values in the super-critical and subcritical states.

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Section: Ads Experimentsmentioning

confidence: 99%

“…Deduced pulsed width and measured subcriticality in dollar units by fuel rod substitution and control rod insertion (Ref [12]…”

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Effective Delayed Neutron Fraction

Yamanaka

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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“…In the accelerator-driven system (ADS) experiments at the Kyoto University Critical Assembly (KUCA), real-time measurements [7]- [8] of  and $ were made in attempts to satisfy sufficient reliability of the measured accuracy of experimental results. Also, at KUCA, experimental analyses of eff were conducted by Monte Carlo calculations with the use of ADS experimental results, demonstrating the dependence of external neutron source [9] and the measurement methodology [10] with respect to eff. Moreover, a variation in the ratio of eff and  ( / eff   obtained by the -fitting method [11] was experimentally examined on subcriticality in hard neutron spectrum cores [12]- [14], with the combined use of the experimental results of  and $.…”

Section: Introductionmentioning

confidence: 99%