Research and development for treatment and disposal technologies of TRU waste; JFY 2010 annual report

Kamei, Gento; Honda, Akira; Oda, Chie; Hirano, Fumio; Ichige, Satoru; Kurimoto, Yoshitaka; Hoshino, Seiichi; Akagi, Yosuke; Sato, Nobuyuki; Takahashi, Kuniaki; et al.

JAEA-Research 2012-010, 80 Pages, 2012/06

JAEA-Research-2012-010.pdf:7.45MB

Based on Japanese governmental policy and general scheme, research and development of geological disposal technology for TRU waste has been proceeding to improve reliability of the safety assessment of the co-locational disposal of TRU waste and of HLW, to expand the basement of generic safety assessment, and to develop the alternative technology to cope with the broad geologic environment of Japan. Japan Atomic Energy Agency is dealing with the assignments in the governmental generic scheme. We report here the progress of the studies at the end of H22 (2010) Japanese fiscal year and their products during the last 5 years. These include (1) evaluation of long-term mechanical stability in the near-field including development of a creep mode of rock and analyses of mechanical behavior of TRU waste repository, (2) performance assessment of the disposal system including cementitious material alteration, bentonite and hostrock alteration with alkaline solution and nitrate effect, and (3) alternative technology development including decomposition of nitrate.

Planning and implementation on transportation of large and heavy components of 1-MW spallation neutron source for Japan Proton Accelerator Research Complex (J-PARC)

Takada, Hiroshi; Kato, Takashi; Kaminaga, Masanori; Natsume, Hiroaki; Hoshino, Yoshihiro

JAEA-Technology 2006-060, 103 Pages, 2007/02

JAEA-Technology-2006-060.pdf:28.51MB

We have planned an installation sequence of large structural components of the 1-MW spallation neutron source station with a high accuracy of an unit of mm with respect to the designed position and a tangential inclination of 1/1000 to horizontal level in Materials & Life Science Experimental Facility (MLF) under the Japan Proton Accelerator Research Complex (J-PARC). We have also carried out transportation and installation of some of structural components having a weight of heavier than 50 ton with a width of over 10 m and a height near 10 m and obtained perspectives to fulfill installation of whole components as designed sequence. In order to implement the surface transportation of such components to the construction site, we have carefully made a planning of the transportation, considering the structural strength of the bridge on the way to the site and temporal removal of structural interferences along the road.

Completion of J-PARC 1MW pulsed spallation neutron source facility, 2; Mercury target system

Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; Okamoto, Yoshihisa; Futakawa, Masatoshi; Aizawa, Hideyuki*; Kinoshita, Hidetaka; Hoshino, Yoshihiro; Kaminaga, Masanori; Kato, Takashi

no journal, , 

The construction of the 1MW class mercury target which the world highest level as the spallation neutron source is going on under the J-PARC project. The mercury target system consists of the mercury target vessel, the mercury circulation system and the target trolley. The outline of the mercury target system and several topics appeared in the course of the system fabrication and assembling are reported. For the target vessel, the residual stress at the beam window was evaluated and it was confirmed that the stress level is low and no problem. For the mercury circulation system, 3D simulation and the remote handling simulation, also the mock-up test for the remote handling devices were carried out. These R&D activities will be reported.