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Futakawa, Masatoshi
IOP Conference Series; Materials Science and Engineering, 74(1), p.012001_1 - 012001_7, 2015/02
Times Cited Count：2 Percentile：65.6(Materials Science, Multidisciplinary)Innovative researches using neutrons are being performed at the Materials and Life Science Experimental Facility, MLF, at the Japan Proton Accelerator Research Complex, J-PARC, in which a mercury target system is installed for MW-class pulse spallation neutron sources. The structural materials of the mercury target are subjected to irradiation damage due to protons and neutrons, very high cycle fatigue damages due to repeated pressure waves caused by the proton beam bombardment in mercury and so-called liquid metal embrittlement. That is, the structural materials must be said to be exposed to the extremely severe environments. In the paper, research and development relating to the material issues in the high power spallation neutron sources that has been performed so far at J-PARC is summarized.
Ebine, Noriya; Suzuki, Masahide
Nihon Oyo Jiki Gakkai-Shi, 25(4-2), p.1051 - 1054, 2001/04
no abstracts in English
; *; A.Gilanyi*; Ara, Katsuyuki; Uesaka, Mitsuru*; Miya, Kenzo*
Nihon Oyo Jiki Gakkai-Shi, 20, p.665 - 668, 1996/00
no abstracts in English
; *; Ara, Katsuyuki; ; A.Gilanyi*; Uesaka, Mitsuru*; Miya, Kenzo*
MAG-95-138, 0, p.61 - 68, 1995/11
no abstracts in English
; Ooka, Norikazu;
Genshiryoku Kogyo, 38(9), p.40 - 45, 1992/00
no abstracts in English
Kusama, Yasuo; Okada, Sohei; Ito, Masayuki; Yagi, Toshiaki; Yoshikawa, Masahito; Yoshida, Kenzo; Machi, Sueo; Tamura, Naoyuki; Kawakami, Waichiro
Radiation Damage to Organic Materials in Nuclear Reactors and Radiation Environments, p.1 - 30, 1989/00
no abstracts in English
Suzudo, Tomoaki
no journal, ,
Tungsten is expected to be a promising plasma-facing material for future fusion devices, but radiation-induced precipitation (RIP), which leads the material to hardening, is a concern at their practical use. One of the keys to accurate prediction of the emergence of RIP is migration of solute atoms, rhenium and osmium, that are produced by nuclear transmutation through irradiation. We conduct numerical simulations using an ab initio informed atomic kinetic Monte Carlo method and investigate the migration of these solute atoms in the form of tungsten-rhenium and tungsten-osmium mixed dumbbells, considered to be the most efficient "carriers" of the solute atoms. We find that the low rotation energy barrier of these mixed dumbbells leading to three-dimensional migration. The result also suggests that, although these dumbbells have three-dimensional motion, one cannot simply reduce their migration behavior to that of vacancy-like spherical objects.
Nagaishi, Ryuji; Kuwano, Ryo*
no journal, ,
The overflow from HIC at ALPS was owing to water radiolysis of beta rays in co-precipitate slurry of carbonate, leading to the volume increase of slurry and supernatant formation. The radiation effects (radiolysis and material degradation) on high-viscous fluids after long-term (high dose) irradiation is quite different from those on low-viscous fluids such as aqueous solutions. The understanding of effects on high-viscous fluids, containing suspension of clay which is planned to be used as a buffer material for final disposal, is important in long-term storage and disposal of radioactive wastes. In this study, the physical and viscosity properties of fluids of co-precipitate and clay systems were measured before and after irradiation of electron beam and gamma ray to discuss the relations among their properties quantitatively.
