scholarly journals Introduction

2021 ◽  
pp. 1-12
Author(s):  
Cheol Ho Pyeon
Keyword(s):  
Feasibility Studies ◽  
Reaction Rates ◽  
Reactor Physics ◽  
Kinetics Parameters ◽  
Neutron Sources ◽  
Combined Use ◽  
Driven System ◽  
Accelerator Driven System ◽  
Pulsed Neutron ◽  
Mev Protons

AbstractAt the Kyoto University Critical Assembly (KUCA), the accelerator-driven system (ADS) is composed of a solid-moderated and solid-reflected core (A-core) and a pulsed-neutron generator (14 MeV neutrons) or the fixed-filed alternating gradient (FFAG) accelerator (100 MeV protons). At KUCA, two external neutron sources, including 14 MeV neutrons and 100 MeV protons, are separately injected into the A-core, and employed for carrying out the ADS experiments. With the combined use of the A-core and two external neutron sources, basic and feasibility studies of ADS have been engaged in the examination of neutronics of ADS, through the measurements of statics and kinetics parameters of reactor physics, including subcritical multiplication factor, subcriticality, prompt neutron decay constant, effective delayed neutron fraction, neutron spectrum, and reaction rates.

scholarly journals Subcritical Multiplication Parameters of the Accelerator-Driven System with 100 MeV Protons at the Kyoto University Critical Assembly

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Jae-Yong Lim ◽  
Cheol Ho Pyeon ◽  
Takahiro Yagi ◽  
Tsuyoshi Misawa
Keyword(s):  
Reaction Rate ◽  
Reaction Rates ◽  
Relative Difference ◽  
Critical Assembly ◽  
The Core ◽  
Driven System ◽  
Accelerator Driven System ◽  
Special Mention ◽  
Basic Experiments ◽  
Mev Protons

Basic experiments on the accelerator-driven system (ADS) at the Kyoto University Critical Assembly are carried out by combining a solid-moderated and -reflected core with the fixed-field alternating gradient accelerator. The reaction rates are measured by the foil activation method to obtain the subcritical multiplication parameters. The numerical calculations are conducted with the use of MCNPX and JENDL/HE-2007 to evaluate the reaction rates of activation foils set in the core region and at the location of the target. Here, a comparison between the measured and calculated eigenvalues reveals a relative difference of around 10% in C/E values. A special mention is made of the fact that the reaction rate analyses in the subcritical systems demonstrate apparently the actual effect of moving the tungsten target into the core on neutron multiplication. A series of further ADS experiments with 100 MeV protons needs to be carried out to evaluate the accuracy of subcritical multiplication parameters.

Experimental benchmarks on kinetic parameters in accelerator-driven system with 100 MeV protons at Kyoto University Critical Assembly

2017 ◽  
Vol 105 ◽  
pp. 346-354 ◽  
Author(s):  
Cheol Ho Pyeon ◽  
Masao Yamanaka ◽  
Tomohiro Endo ◽  
Willem Fredrik G. van Rooijen ◽  
Go Chiba
Keyword(s):  
Kinetic Parameters ◽  
Critical Assembly ◽  
Driven System ◽  
Accelerator Driven System ◽  
Mev Protons

scholarly journals Effective Delayed Neutron Fraction

2021 ◽  
pp. 83-123
Author(s):  
Masao Yamanaka
Keyword(s):  
Neutron Source ◽  
Weighting Function ◽  
Nuclear Data ◽  
Ratio Method ◽  
Kinetics Parameters ◽  
Combined Use ◽  
Numerical Precision ◽  
Spallation Neutrons ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

AbstractIn 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.

scholarly journals Accuracy of reaction rates in the accelerator-driven system with 14MeV neutrons at the Kyoto University Critical Assembly

2012 ◽  
Vol 40 (1) ◽  
pp. 229-236 ◽  
Author(s):  
Cheol Ho Pyeon ◽  
Yuki Takemoto ◽  
Takahiro Yagi ◽  
Jae-Yong Lim ◽  
Yoshiyuki Takahashi ◽  
...  
Keyword(s):  
Reaction Rates ◽  
Critical Assembly ◽  
Driven System ◽  
Accelerator Driven System

Conceptual design of multi-targets for accelerator-driven system experiments with 100-MeV protons

2013 ◽  
Vol 54 ◽  
pp. 162-166 ◽  
Author(s):  
Yoshiyuki Takahashi ◽  
Tetsushi Azuma ◽  
Teiji Nishio ◽  
Takahiro Yagi ◽  
Cheol Ho Pyeon ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Driven System ◽  
Accelerator Driven System ◽  
Mev Protons

Accuracy of Reactor Physics Parameters in Thorium-Loaded Accelerator-Driven System Experiments at Kyoto University Critical Assembly

2016 ◽  
Vol 183 (1) ◽  
pp. 96-106 ◽  
Author(s):  
Masao Yamanaka ◽  
Cheol Ho Pyeon ◽  
Takahiro Yagi ◽  
Tsuyoshi Misawa
Keyword(s):  
Critical Assembly ◽  
Reactor Physics ◽  
Driven System ◽  
Accelerator Driven System

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

2017 ◽  
Vol 55 (2) ◽  
pp. 190-198 ◽  
Author(s):  
Cheol Ho Pyeon ◽  
Thanh Mai Vu ◽  
Masao Yamanaka ◽  
Takanori Sugawara ◽  
Hiroki Iwamoto ◽  
...  
Keyword(s):  
Reaction Rate ◽  
Critical Assembly ◽  
Driven System ◽  
Accelerator Driven System ◽  
Mev Protons

scholarly journals Study of an ADS Loaded with Thorium and Reprocessed Fuel

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Graiciany de Paula Barros ◽  
Claubia Pereira ◽  
Maria A. F. Veloso ◽  
Antonella L. Costa
Keyword(s):  
Nuclear Fuel ◽  
Monte Carlo Code ◽  
Spent Fuel ◽  
Fuel Rods ◽  
Driven Systems ◽  
The Core ◽  
Combined Use ◽  
Driven System ◽  
Accelerator Driven System ◽  
Accelerator Driven Systems

Accelerator-driven systems (ADSs) are investigated for long-lived fission product transmutation and fuel regeneration. The aim of this paper is to investigate the nuclear fuel evolution and the neutronic parameters of a lead-cooled accelerator-driven system used for fuel breeding. The fuel used in some fuel rods wasT232hO2forU233production. In the other fuel rods was used a mixture based upon Pu-MA, removed from PWR-spent fuel, reprocessed by GANEX, and finally spiked with thorium or depleted uranium. The use of reprocessed fuel ensured the use ofT232hO2without the initial requirement ofU233enrichment. In this paper was used the Monte Carlo code MCNPX 2.6.0 that presents the depletion/burnup capability, combining an ADS source and kcode-mode (for criticality calculations). The multiplication factor (keff) evolution, the neutron energy spectra in the core at BOL, and the nuclear fuel evolution during the burnup were evaluated. The results indicated that the combined use ofT232hO2and reprocessed fuel allowedU233production without the initial requirement ofU233enrichment.

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