Category Archives: Nuclear Back-end and Transmutation Technology for Waste Disposal

Effect of Boiling Heat Transfer on Surface Wettability

10.3.1 Experimental Setup and Procedure A schematic view of the experimental apparatus for pool boiling experiments with small heat transfer area is shown in Fig. 10.5. The apparatus consists of a copper block, a furnace, a rectangular container, and a heat exchanger. The copper block has a cylindrical part (10 mm in diameter, 15 mm in height). Several cartridge

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Development of the Method to Assay Barely Measurable Elements in Spent Nuclear Fuel and Application to BWR 9 x 9 Fuel

Kenya Suyama, Gunzo Uchiyama, Hiroyuki Fukaya, Miki Umeda, Toru Yamamoto, and Motomu Suzuki Abstract In fission products in used nuclear fuel, there are several stable isotopes that have a large neutron absorption effect. For evaluation of the neutronics characteristics of a nuclear reactor, the amount of such isotopes should be evaluated by using burn-up calculation codes. To confirm the correctness […]

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Nuclear Transmutation of Long-Lived Nuclides with Laser Compton Scattering: Quantitative Analysis by Theoretical Approach

Shizuka Takai and Kouichi Hagino Abstract A photo-neutron (y, n) reaction with laser Compton scattering y-rays has been suggested to be effective for the nuclear transmutations of fission products. The photo-neutron reaction occurs via a giant dipole resonance, which has a large cross section and whose properties are smooth functions of mass number. The laser Compton scattering can generate effectively […]

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Accelerator-Driven System (ADS) Study in Kyoto University Research Reactor Institute (KURRI)

Cheol Ho Pyeon Abstract Experimental studies on the uranium — and thorium-loaded accelerator — driven system (ADS) are being conducted for basic research of nuclear transmuta­tion analyses with the combined use of the core at the Kyoto University Critical Assembly (KUCA) and the fixed-field alternating gradient (FFAG; 100 MeV pro­tons) accelerator in the Kyoto University Research Reactor Institute. The ADS […]

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Development of Nondestructive Assay to Fuel Debris of Fukushima Daiichi NPP (1): Experimental Validation for the Application of a Self-Indication Method

Jun-ichi Hori, Tadafumi Sano, Yoshiyuki Takahashi, Hironobu Unesaki, and Ken Nakajima Abstract We have proposed a new concept of the “self-indication method” combined with neutron resonance densitometry (NRD) for nondestructive assaying of the distribution of nuclear materials in the fuel debris of Fukushima Daiichi NPP. To verify the method, we performed experiments using a 46 MeV electron linear accelerator at […]

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Experimental Study of Flow Structure and Turbulent Characteristics in Lead — Bismuth Two-Phase Flow

Gen Ariyoshi, Daisuke Ito, and Yasushi Saito Abstract In a severe accident of a lead-bismuth-cooled accelerator-driven system, a gas-liquid two-phase flow with a large liquid-to-gas density ratio might appear, such as a steam leakage into hot lead-bismuth flow. It is still difficult to predict such phenomena because there are no available flow models for two-phase flow with a large density […]

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Calculation Method

1.2.1 Reaction via Giant Dipole Resonance Nuclear transmutation with laser Compton scattering uses photonuclear reactions via GDR because the cross section of GDR is quite large and the total cross section is a smooth function of mass number. GDR is a collective excitation of a nucleus involving almost all nucleons, which is interpreted classically as a macroscopic oscillation of a […]

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Experimental Settings

9.2.1 Uranium-Loaded ADS Experiments KUCA comprises two solid polyethylene-moderated thermal cores designated A and B and one water-moderated thermal core designated C. The A-core is mainly used for experiments of ADS basic research. The three cores are operated at a low mW power in the normal operating state; the maximum power is 100 W. The constitution and the configuration of […]

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Experiment

To verify the self-indication method, we have performed three kinds of experiments using a 46 MeV electron linear accelerator (linac) at the Kyoto University Research Reactor Institute. The experimental arrangement is shown in Fig. 3.1. Pulsed neutrons were produced from a water-cooled photo-neutron target assembly, 5 cm in diameter and 6 cm long, which was composed of 12 sheets of […]

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