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Masumoto, Kazuhiko*; Takeuchi, Ryuji
Oyo Chishitsu, 57(4), p.154 - 161, 2016/10
Fractures developing around the tunnel during the excavation result in issues related not only to the mechanical stability of the rock cavern, but also to the groundwater flow paths. In order to estimate the possibility of application of the GPR (Ground Penetration Radar) to estimate the fractures as low paths, the authors conducted the GPR survey along the side wall of 500 m access tunnel of the Mizunami Underground Research Laboratory of JAEA. The results of the profile measurements indicated that water-conductiong fractures were detected as a reflected waves using GPR survay. Furthermore, as the results of fixed-point measurements during the injection of the saline water, it could be indicated to estimate the flow paths of saline water in the fractures, in a non-destructive way, based on spectral analysis in the reflected waveforms of GPR.
Ozu, Akira
Genshiryoku eye, 51(11), p.68 - 71, 2005/11
In order to develop technologies for predicting and monitoring the atmospheric dispersion of aerosols containing radionuclides, a feasibility study on the real-time measurement of the aerosol being released into atmosphere from nuclear facilities has been conducted by using a laser radar technique. We have developed a remote particle counter capable of monitoring aerosol suspended in a distance space. The particle counter can measure the number and size of the aerosol on real-time basis. The performance of the counter was examined compared with that of conventional particle counters. It was found that aerosols with diameter of 
0.5 microns could be detected at a distance of 5 m. The technique is also applicable and useful for the aerosol monitoring in the other field such as semiconductor industries.
*; *; Yabuuchi, Satoshi
JNC TY7400 2000-001, 72 Pages, 2000/03
JNC-TY7400-2000-001.pdf:4.01MB
None
*
JNC TJ7420 2000-007, 28 Pages, 2000/03
JNC-TJ7420-2000-007.pdf:11.92MB
no abstracts in English
Imai, Hisashi*; Nishida, Kaoru*; *; Amemiya, Kiyoshi*; Lin, Weiren*
PNC TJ1449 98-004, 231 Pages, 1998/02
None
PNC TN7410 90-003, 37 Pages, 1989/11
The radar technique is one of the methods to obtain geometric information of fracture zones in rock masses. The orientation and width of fractures are mapped as variation of velocity and attenuation of electromagnetic waves. In 1988, PNC introduced a borehole radar system (RAMAC) developed in Sweden. Singlehole reflection measurements were performed with this system in a borehole in the granite at Tono area in Gifu prefecture (depth:450m 
975m). Integrated analysis on the result was carried out in the combination of the core logging data. Twenty MHz antenna was used as the center frequency in the measurement. The following conclusions were obtained from the result of that analysis. (1)It is possible to identify geometry of the fractures system at some depth on the radar reflection map. (2)By the radar technique, it is not possible to detect each fracture but fracture zones, because the resolution of the radar with several metres is lower than that of core observation with several centimetres.
; ; ; ; Kawakami, Waichiro
EIM-86-129, p.1 - 10, 1986/00
no abstracts in English
Yamada, Nobuto; Suzuki, Keiichi*; Kanazawa, Sunao*; Tsuge, Takashi*
no journal, ,
To evaluate the distribution of geological discontinuity such as fractures around the underground gallery is one of the important factors to conduct high level radioactive waste disposal, but it is difficult to evaluate them enough only by geological survey such as boring investigations. We carried out GPR to obtain the distribution of fractures exist nearby the underground gallery of granite in Mizunami Underground Research Laboratory, and understand that we can detect them by GPR.
Kurihara, Keisuke*; Masumoto, Kazuhiko*; Takeuchi, Ryuji
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*; Takeuchi, Ryuji; Onoe, Hironori
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*; Matsushita, Tomoaki*; Takeuchi, Ryuji
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*; Matsushita, Tomoaki*; Takeuchi, Ryuji
no journal, ,
The monitoring of groundwater condition in fractures around the rock cavern is important for safety assessment for high level radioactive waste. The GPR (Ground Penetrating Radar) method is unique technique to survey the water condition in fractures, indirectly, and with no disturbance of original groundwater condition. The authors conducted the GPR monitoring of infiltration of saline water on the side wall of the 500m access tunnel of Mizunami Underground Research Laboratory. The results showed that the difference of saline concentration in fractures caused the change of the reflection wave form and the intense of spectrum due to the results of spectrum analysis of reflection wave.
Matsui, Hiroya; Sanoki, Satoru*
no journal, ,
no abstracts in English
