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Sugita, Yutaka; Aoyagi, Kazuhei; Kubota, Kenji*; Nakata, Eiji*; Oyama, Takahiro*
JAEA-Research 2018-002, 72 Pages, 2018/06
JAEA-Research-2018-002.pdf:6.16MB
In a excavation of shafts and galleries in the deep underground for disposing radioactive waste, an excavation damaged zone (EDZ) is developed around the galleries and shafts owing to the stress redistribution. Since the characteristic changes of the rock mass in the EDZ affects the radionuclides migration behavior, it is important to understand the long-term behavior of the EDZ. Thus, we performed the in situ experiment to investigate the long-term behavior of EDZ as part of the collaborative research between Japan Atomic Energy Agency and Central Research Institute of Electric Power Industry in the 140m gallery in the Horonobe Underground Research Laboratory. In this research, we investigated the extent, mechanism of the change of hydro-mechanical characteristic, and long-term behavior of the EDZ on the basis of the comprehensive estimation of the results of the observation of the drift wall and the various investigations using boreholes such as geological investigation, the seismic and resistivity tomography, hydraulic test, water content monitoring, borehole loading test, convergence measurement, and so on. In addition, we clarified applicability and future tasks of the testing method used in this research for the investigation of the long-term behavior of the EDZ.
Aoyagi, Kazuhei; Kubota, Kenji*; Nakata, Eiji*; Suenaga, Hiroshi*; Nohara, Shintaro*
JAEA-Research 2017-004, 91 Pages, 2017/06
JAEA-Research-2017-004.pdf:6.07MB
In this study, we performed seismic tomography, seismic refraction survey, resistivity tomography, and hydraulic tests to investigate the hydro-mechanical property of the excavation damaged zone (EDZ) in the 250 m gallery of the Horonobe Underground Research Laboratory. As a result of seismic tomography, seismic velocity is significantly decreased within 1 m from the gallery wall. The decrease of seismic velocity is related to the density of fracture induced around the gallery wall as a result of the gallery excavation. Thus the extent of the fractures induced by gallery excavation, i.e., EDZ fractures is clarified to be within 1.0 m from the gallery wall. The enhanced hydraulic conductivity was detected within 0.5 to 1.0 m from the gallery wall on the basis of the result of hydraulic tests. This is almost consistent with the extent of the region that seismic velocity is significantly decreased. Therefore, it is estimated that EDZ fractures induced around the gallery leads to the increase of hydraulic conductivity. In addition, the desaturation zone around the gallery is not induced as a result of resistivity tomography. From these results, the hydro-mechanical property of the EDZ is clarified in detail. Also, the in situ tests and evaluation method applied in this study are appropriate to investigate the EDZ in detail.
Yamakawa, Koji*; Chimi, Yasuhiro; Ishikawa, Norito; Iwase, Akihiro*
Journal of Alloys and Compounds, 370(1-2), p.211 - 216, 2004/05
Times Cited Count：1 Percentile：12.56(Chemistry, Physical)The migration of hydrogen in Pd-1at.% Fe-H and Pd-1at.% Ag-H alloys is investigated by electrical resistivity measurement around 50 K. The disordered hydrogen atoms are introduced by electron irradiation with 0.5 MeV electrons below 15 K. The disordered atoms order by migration of hydrogen atoms during the heating-up of the specimens. The recovery curves of electrical resistivity have two sub-stages for electron irradiated specimens and one stage for fast cooled specimens. The migration energy of hydrogen is obtained from the kinetic analysis of the resistivity change due to the ordering, using the cross-cut method for the electron irradiated specimen and fast cooled specimen. The obtained value of the migration energy for the low temperature stage is smaller than that for the high temperature stage. The value for the high temperature stage is similar to the energy for the case of fast cooling. The difference between the hydrogen atoms disordered by irradiation and that by fast cooling is discussed for Pd based alloys.
Baba, Shinichi; Ishihara, Masahiro; Minakawa, Nobuaki; Suzuki, Junichi
Proceedings of International Conference on Advanced Technology in Experimental Mechanics 2003 (ATEM '03) (CD-ROM), 4 Pages, 2003/09
The aim of the present paper is to clarify the residual stress occuring in the c/c composite to improve the manufacturing process. The residual stress was measured by a neutron diffraction method using the RESA in the JRR-3M of JAERI in this study. As a results of the residual stress measurment, it was found that the residual stress of the ring type c/c composite is the comporessive stress, and the macroscopic residual strain/stress is absorbed mainly microstructural change such as pore shape change.
Chimi, Yasuhiro; Iwase, Akihiro; Iwata, Tadao*
Nuclear Instruments and Methods in Physics Research B, 209, p.159 - 164, 2003/08
Times Cited Count：2 Percentile：21.42(Instruments & Instrumentation)Accumulation of defects during energetic ion irradiation below 
10K in platinum thin films is studied by electrical resistivity measurements. Experimental results are analyzed by using a model which describes the production and selective radiation annealing of defects. For high-energy (100MeV) heavy ion irradiations, radiation annealing process due to electronic excitation is found mainly at the initial stage of irradiation. From the defect accumulation curve and defect recovery spectra, the effective temperature corresponding to the lattice agitation induced by electronic excitation is estimated.
Ishiyama, Shintaro; Eto, Motokuni
Nihon Genshiryoku Gakkai-Shi, 43(11), p.1159 - 1166, 2001/11
Times Cited Count：2 Percentile：19.91(Nuclear Science & Technology)no abstracts in English
Eto, Motokuni; Konishi, Takashi*
Tanso, (186), p.30 - 35, 1999/00
no abstracts in English
Hoshiya, Taiji; *; Katsuta, Hiroji; Ando, Hiroei
Nihon Kinzoku Gakkai-Shi, 56(7), p.747 - 756, 1992/00
no abstracts in English
Hoshiya, Taiji; Takamura, Saburo; ; *
Japanese Journal of Applied Physics, 29(8), p.L1443 - L1445, 1990/08
Times Cited Count：4 Percentile：29.91(Physics, Applied)no abstracts in English
Takamura, Saburo; Hoshiya, Taiji; ; *
Japanese Journal of Applied Physics, 28(8), p.L1395 - L1397, 1989/08
Times Cited Count：3 Percentile：23.83(Physics, Applied)no abstracts in English
Takamura, Saburo; ; Hoshiya, Taiji
Japanese Journal of Applied Physics, 28(7), p.L1118 - L1120, 1989/07
Times Cited Count：13 Percentile：59.19(Physics, Applied)no abstracts in English
; Hanashima, Susumu
Nuclear Instruments and Methods in Physics Research A, 268, p.461 - 464, 1988/00
Times Cited Count：0 Percentile：0.02(Instruments & Instrumentation)no abstracts in English
; ; ; ; JT-60 Team
JAERI-M 87-029, 30 Pages, 1987/03
no abstracts in English
; *; *
Journal of Nuclear Materials, 144, p.205 - 206, 1987/00
Times Cited Count：2 Percentile：64.79(Materials Science, Multidisciplinary)no abstracts in English
; Hagiwara, Miyuki; Kawanishi, Shuichi; Sasuga, Tsuneo; ; *; *; Sonoda, Katsumi*; *; *; et al.
JAERI-M 85-220, 26 Pages, 1986/01
no abstracts in English
Journal of Nuclear Materials, 138, p.131 - 134, 1986/00
Times Cited Count：0 Percentile：0.36(Materials Science, Multidisciplinary)no abstracts in English
; Aruga, T.; *
Journal of Nuclear Materials, 136, p.159 - 163, 1985/00
Times Cited Count：13 Percentile：82.1(Materials Science, Multidisciplinary)no abstracts in English
*; ; *
Journal of Nuclear Materials, 131, p.53 - 60, 1985/00
Times Cited Count：16 Percentile：85.48(Materials Science, Multidisciplinary)no abstracts in English
; ; ; *
Journal of Nuclear Materials, 133-134, p.365 - 369, 1985/00
Times Cited Count：12 Percentile：80.63(Materials Science, Multidisciplinary)no abstracts in English
*; ; *; *
Journal of Nuclear Materials, 135, p.32 - 39, 1985/00
Times Cited Count：4 Percentile：60.04(Materials Science, Multidisciplinary)no abstracts in English
