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Sawaguchi, Takuma; Takai, Shizuka; Sasagawa, Tsuyoshi; Uchikoshi, Emiko*; Shima, Yosuke*; Takeda, Seiji
MRS Advances (Internet), 8(6), p.243 - 249, 2023/06
In the intermediate depth disposal of relatively high-level radioactive waste, a method to confirm whether the borehole for monitoring is properly sealed should be developed in advance. In this study, groundwater flow analyses were performed for the hydrogeological structures with backfilled boreholes, assuming sedimentary rock area, to understand what backfill design conditions could prevent significant water pathways in the borehole, and to identify the confirmation points of borehole sealing. The results indicated the conditions to prevent water pathways in the borehole and BDZ (Borehole Disturbed Zone), such as designing the permeability of bentonite material less than or equal to that of the host rock, and grouting BDZ.
Cao, X.; Suzaki, Takenori; Kugo, Teruhiko; Mori, Takamasa
JAERI-Tech 2003-069, 36 Pages, 2003/08
JAERI-Tech-2003-069.pdf:3.77MB
From the viewpoint of nuclear criticality safety of fuel rod storage and transport, a series of critical experiments concerning effects of water hole size, water gap width, water-to-fuel volume ratio and non-uniform arrangement of water moderator have been performed at the Tank-type Critical Assembly (TCA) of Japan Atomic Energy Research Institute. In the present study, the effects of volume fraction and non-uniform arrangement of water moderator on reactivity are evaluated by the water level worth method and analyzed by the SRAC code. Error sources of experiments and calculations are discussed, especially for an energy group model. The calculation results of diffusion model with 17-group model show good agreement with the experiment results within a few dozen cents.
Konno, Chikara; Maekawa, Fujio; Kasugai, Yoshimi; Uno, Yoshitomo; Kaneko, Junichi; Nishitani, Takeo; Wada, Masayuki*; Ikeda, Yujiro; Takeuchi, Hiroshi
Nuclear Fusion, 41(3), p.333 - 337, 2001/03
Times Cited Count：3 Percentile：10.95(Physics, Fluids & Plasmas)no abstracts in English
; Yamamoto, Katsumune; ; ; ; ; *; *
JAERI-M 8332, 110 Pages, 1979/07
no abstracts in English
Miwa, Junichi*; Hino, Tetsushi*; Mitsuyasu, Takeshi*; Nagaya, Yasunobu
no journal, ,
We performed whole-core Monte Carlo calculations for core design verification of an innovative BWR concept, resource-renewable boiling water reactor (RBWR). The calculations include a coupled neutronics/thermal-hydraulics calculation with a continuous-energy Monte Carlo code MVP and an inhouse thermal-hydraulics code, and a burnup calculation with the MVP-BURN code. Such calculations for the RBWR is challenging because it requires a large memory size and a large amount of calculation time. The typical memory size required for the RBWR calculations was an order of 10 GBytes per CPU in parallel computing using a desktop PC cluster. The total calculation time for calculating the characteristics of the equilibrium core of RBWR with the whole-core Monte Carlo burnup calculation using the desktop PC cluster was about 20 days. We demonstrated that the design calculations for the RBWR were possible with such a desktop PC cluster.
