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Sata, Tsutomu; Sakuma, Minoru
Nihon Genshiryoku Gakkai-Shi ATOMO
, 54(2), p.101 - 104, 2012/02
JAEA has been support for the convergence of the accident in the Fukushima Daiichi NPP and for environmental restoration of radioactive contaminated land since March 11. They are as follows; scientific advice to government and environmental radiation monitoring, decontamination, provision of knowledge and technology.
; Sakuma, Minoru; Harada, Hideo
PNC TN9410 95-072, 39 Pages, 1995/04
Study was performed on hybrid systems of a subcritical fission reactor driven by an accelerator last year. A system using solid core fuel and a solid target was concluded to have the highest technical feasibility among them. The system of the highest feasibility was studied this year. The system studied this year uses a subcritical LMFR based on a reactor like "JOYO" and the accelerator. The study was specially focused on a core, the accelerator and reconstracted parts of the reactor. The chief end of the reconstraction is for building a plant to grasp plant characteristics of burning TRU. The objective of a reconstracted plant is acquirement of experimental data and actual results on burning TRU by changing its core geometrical parameters. Therefore the policy of the reconstruction is conserving the present state of the reactor as far as possible. Component exchange is performed only on its upper core structure. Concerning the core, its target part consists of 19 target assemblies made of tangsten and its fuel part surrounding the target part consists of fuel assemblies made of TRU metal or oxide. Core height is 1 m. Four control rods are set in the core in order to get flat power density distribution there. A proton linear accelerator of the capability of 500Mev and 10mA is adopted as the accelerator for the hybrid system. The proton accelerator is set at the south west direction part of the reactor where there are few buildings. In addition to the above, reconstruction arrangements, items required to get a liscence and RD items are studied in this report.
Hirano, Koichiro; Sakuma, Minoru; Yoshikawa, Kiyoshi*; Onishi, Masami*; Yamamoto, Yasushi*; Toku, Hisayuki*
PNC TY1604 95-001, 118 Pages, 1995/03
no abstracts in English
Yoshikawa, Kiyoshi*; Onishi, Masami*; Yamamoto, Yasushi*; Toku, Hisayuki*; Hirano, Koichiro; Sakuma, Minoru
PNC TY9604 94-001, 118 Pages, 1994/03
None
; Sakuma, Minoru; Harada, Hideo
PNC TN9410 94-086, 45 Pages, 1994/03
Some hybrid system with a subcritical fission reactor driven by an accelerator have been studied in a few foreign countries and Japan. Those concepts make reactor safety seem high, but they have many technological difficulties, Authors have tried to make sure those difficulties, based on concepts proposed by LANL, BNL and JAERI, in order to clarify the technical feasibility of them as much as possible. A system using solid core fuel, with accelerated beam injection from its upper side and a solid target, was considered to have the highest technical feasibility among them. Authors have proposed a conceptual design of such system, and performed a study on technical problems to be solved and on R&D's required in order to realize it. The economy and the safety were also studied on it as far as possible.
