Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Yoshitomi, Hiroshi
FBNews, (557), p.1 - 5, 2023/05
no abstracts in English
Li, C.-Y.; Uchibori, Akihiro; Takata, Takashi; Pellegrini, M.*; Erkan, N.*; Okamoto, Koji*
Dai-25-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu (Internet), 4 Pages, 2021/07
The capability of stable cooling and avoiding re-criticality on the debris bed are the main issues for achieving IVR (In-Vessel Retention). In the actual situation, the debris bed is composed of mixed-density debris particles. Hence, when these mixed-density debris particles were launched to re-distribute, the debris bed would possibly form a density-stratified distribution. For the proper evaluation of this scenario, the multi-physics model of CFD-DEM-Monte-Carlo based neutronics is established to investigate the coolability and re-criticality on the heterogeneous density-stratified debris bed with considering the particle relocation. The CFD-DEM model has been verified by utilizing water injection experiments on the mixed-density particle bed in the first portion of this research. In the second portion, the coupled system of the CFD-DEM-Monte-Carlo based neutronics model is applied to reactor cases. Afterward, the debris particles' movement, debris particles' and coolant's temperature, and the k-eff eigenvalue are successfully tracked. Ultimately, the relocation and stratification effects on debris bed's coolability and re-criticality had been quantitatively confirmed.
Endo, Akira; Kim, E.; Yamaguchi, Yasuhiro; Sato, Tatsuhiko; Yoshizawa, Michio; Tanaka, Susumu; Nakamura, Takashi; Rasolonjatovo, A. H. D.*
Journal of Nuclear Science and Technology, 41(Suppl.4), p.510 - 513, 2004/03
no abstracts in English
Yoshizawa, Michio; Saegusa, Jun; Tanimura, Yoshihiko; Yoshida, Makoto
Proceedings of 14th Meeting of Consultative Committee for Ionizing Radiation, 5 Pages, 2002/00
no abstracts in English
Nishino, Sho; Umino, Kazushige*; Yoshitomi, Hiroshi; Fukami, Tomoyo; Tsuji, Tomoya; Tanimura, Yoshihiko
no journal, ,
In the Facility of Radiation Standards (FRS) of JAEA, mono-energetic neutron calibration fields and a high-energy 
-ray calibration field using a 4MV Van de Graaff accelerator has been established, for calibration or characteristic tests of radiation measuring instruments. In this presentation, usage status and details of troubles occurred in the FRS accelerator in recent years will be reported.
Yoshitomi, Hiroshi
no journal, ,
no abstracts in English
Yoshitomi, Hiroshi; Nishino, Sho; Tsuji, Tomoya; Fukami, Tomoyo; Takamine, Jun; Umino, Kazushige*; Murayama, Takashi; Tanimura, Yoshihiko
no journal, ,
no abstracts in English
Yoshitomi, Hiroshi
no journal, ,
no abstracts in English
