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Journal Articles

Optimization study on accelerator driven system design for effective transmutation of iodine-129

Ismailov, K.*; Nishihara, Kenji; Saito, Masaki*; Sagara, Hiroshi*

Annals of Nuclear Energy, 56, p.136 - 142, 2013/06

 Times Cited Count:6 Percentile:44.21(Nuclear Science & Technology)

The transmutation of iodine-129 in accelerator driven system (ADS) is studied. The sodium iodide assembly loadings inside the core of ADS and in the surrounding core region are considered. The introduced concept of ADS with a power of 800 MWt is able to transmute 250 kg/y of minor actinides (MAs) and 46 kg/y of Iodine-129 that supports ten PWRs. The initial loading masses of MAs and I-129 in ADS were equal to 3810 kg and 824 kg, respectively.

Journal Articles

Monte Carlo analysis of the long-lived fission product neutron capture rates at the Transmutation by Adiabatic Resonance Crossing (TARC) experiment

Ab$'a$nades, A.*; $'A$lvarez-Velarde, F.*; Gonz$'a$lez-Romero, E. M.*; Ismailov, K.*; Lafuente, A.*; Nishihara, Kenji; Saito, Masaki*; Stanculescu, A.*; Sugawara, Takanori

Nuclear Engineering and Design, 254, p.148 - 153, 2013/01

 Times Cited Count:1 Percentile:10.75(Nuclear Science & Technology)

The design of Accelerator Driven Systems (ADS) requires the development of simulation tools that are able to describe in a realistic way their nuclear performance and transmutation rate capability. In this publication, we present an evaluation of state of the art Monte Carlo design tools to assess their performance concerning transmutation of long-lived fission products. This work, performed under the umbrella of the International Atomic Energy Agency, analyses two important aspects for transmutation systems: moderation on Lead and neutron captures of $$^{99}$$Tc, $$^{127}$$I and $$^{129}$$I. The analysis of the results shows how shielding effects due to the resonances at epithermal energies of these nuclides affects strongly their transmutation rate. The results suggest that some research effort should be undertaken to improve the quality of Iodine nuclear data at epithermal and fast neutron energy to obtain a reliable transmutation estimation.

Journal Articles

Transmutation by Adiabatic Resonance Crossing Experiment (TARC) benchmarking

Ismailov, K.*; Nishihara, Kenji; Sasa, Toshinobu; Sugawara, Takanori; Saito, Masaki*

Annals of Nuclear Energy, 38(10), p.2180 - 2186, 2011/10

 Times Cited Count:4 Percentile:32.68(Nuclear Science & Technology)

In present study the benchmarking of TARC experiment was done. MCNPX code with JENDL-HE, JENDL-4, JENDL-3.3 and LA-150 nuclear data libraries were used for simulations. The calculated neutron fluences, energy-time correlations of resonance reactions and transmutation rates of $$^{99}$$Tc and $$^{127,129}$$I were compared with experimental measurements. On the base of comparative analysis of simulations the validation of nuclear data libraries was performed and recommendations were given, as follows: (1) the JENDL-4 library contains better neutron elastic cross-section data for natural lead in energy range from 0.01 eV to 100 eV comparing to other considered data libraries; (2) the JENDL-HE (JENDL-3.3) has better neutron inelastic scattering cross-sections for lead in energy range of 1-3 MeV, although the experimental errors in neutron fluence are rather large; (3) neutron capture cross-sections of $$^{129}$$I in JENDL-4 library should be used for $$^{129}$$I transmutation process simulations.

Journal Articles

Feasibility of uranium spallation target in accelerator-driven system

Ismailov, K.*; Saito, Masaki*; Sagara, Hiroshi*; Nishihara, Kenji

Progress in Nuclear Energy, 53(7), p.925 - 929, 2011/09

 Times Cited Count:10 Percentile:61.04(Nuclear Science & Technology)

A feasibility study on natural uranium spallation target in accelerator-driven system (ADS) for minor actinide (MA) transmutation was performed. As a result of comparative study of uranium and lead-bismuth (PbBi) targets in the bare case without blanket surrounding, it was found that uranium target had better neutron generation performance, but limited by the geometrical size due to high neutron absorption in $$^{238}$$U. In ADS for MA transmutation, uranium used as target instead of PbBi also absorbs neutrons passing the target area. More realistic concept of pin type uranium spallation target cooled by liquid PbBi was considered aiming at enhancing spallation target performance in terms of neutron generation efficiency and operation temperature. The uranium pin target design had nothing better effects on neutron balance of such system than a conventional PbBi target in ADS and it was concluded that uranium target was not suitable for the full-scale ADS.

Oral presentation

Neutronic benchmarking of transmutation by adiabatic resonance crossing experiment

Ismailov, K.*; Nishihara, Kenji; Sasa, Toshinobu; Saito, Masaki*

no journal, , 

The Transmutation by Adiabatic Resonance Crossing (TARC) experiment was performed in order to demonstrate the efficiency of the neutron Adiabatic Resonance Crossing (ARC) moderation effect in the transmutation of long lived fission products (as $$^{99}$$Tc and $$^{127,129}$$I) in a large Lead Block. The high quality of data makes TARC experiment a good benchmark for validation of neutron physics over a broad energy. This article describes the result of the validation for the PHITS code and JENDL/HE file by the TARC experiment. The analysis revealed the neutron flux by the PHITS code is 1.15 times larger than that by the MCNPX code, while both flux are within the experimental error. Flux using JENDL/HE file agreed better to the experimental result than that using the LA-150 nuclear library.

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