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Lee, S.; Yoshikawa, Hideki; Matsui, Toshiya*
Materials Research Society Symposium Proceedings, Vol.1265, p.209 - 214, 2010/11
A corrosion experiment were performed for carbon steel contacted with iron reducing bacteria. After incubation for 41 days, biofilm and some corrosion products were observed and determined by SEM analysis. It is clear that Vivianite, which is considered as a protect material for iron corrosion, has been generated as an iron corrosion product with contribution of iron reducing bacteria from this experiment.
Sugita, Yutaka; Nakamura, Takahiro; Sanada, Hiroyuki; Aizawa, Takao*; Ito, Shunichiro*
Materials Research Society Symposium Proceedings, Vol.1265, p.39 - 44, 2010/11
The creation of an excavation disturbed zone (EDZ) is expected around the gallery when the gallery is excavated in the underground to dispose the radioactive waste. In-situ EDZ experiment has been performed to determine the rock properties and width of the EDZ in 140m gallery at a depth of 140m below the surface at Horonobe URL. In the experiment, seismic tomography measurement was performed by using seismic source to observe width of the EDZ. Observation area is 3m square horizontal plane along the sidewall of the 140m gallery. During excavation of the 140m gallery, seismic tomography measurement was performed repeatedly with processing of excavation of the gallery, and the change of velocity distribution of the rock around the gallery was observed. Seismic tomography investigation caught the EDZ developed around the excavated gallery.
Ishii, Yasuo; Seida, Yoshimi; Tachi, Yukio; Yoshikawa, Hideki
Materials Research Society Symposium Proceedings, Vol.1265, p.233 - 238, 2010/09
Influence of stagnation of the test tracer solution and diffusion resistance in the filters on data acquisition were measured by Cs
and I
diffusion experiments and the range of uncertainties of these effects was estimated by calculation of the simulated experimental component. From the ID experiment and the model analysis, it was found that the simultaneous data acquisition of RD and ID methods decreased the residue of retardation parameters effectively.
Hatanaka, Koichiro; Lim, D.-H.*; Ishii, Eiichi
Materials Research Society Symposium Proceedings, Vol.1265, 6 Pages, 2010/00
A three-dimensional DFN geo-descriptive model is developed for WCFs in the sedimentary formations of Horonobe URL in Japan. Fracturing and faulting system in/around the URL area, which is the main investigation area of the Horonobe URL project, is characterized by taking into account borehole geophysical logging data, regional geologic/structural data, and fracture/fault data (orientation, intensity, size) obtained from the surface-based investigations. Volumetric fracture intensity potential is estimated by the correlation and the multi-linear regression analysis of observed data, and is used as one of controls for 3-D DFN model. A regional scale 3-D geo-descriptive DFN model is constructed based on the analyzed fracturing system identified for the WCFs. The current 3-D geo-descriptive model could be utilized explicitly to derive PA parameters for the hypothetical repository of the high-level radioactive wastes in Japan, and to assist optimization of the safe repository design.
