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JNC TN8430 2001-006, 65 Pages, 2001/10
JNC-TN8430-2001-006.pdf:15.23MB
We had been conducted to study hydraulic permeability along fracture intersection by NETBLOCK system using natural rock specimen. Since the permeability of this rock specimen fracture is high, it was suggest that turbulent flow might be occurred in available range of measurement system. In case of turbulent flow, estimated permeability and fracture aperture from test data tend to be low. Therefore we should achieve laminar flow. This study was used the high viscosity liquid instead of water, and test conditions which could attain laminar flow with the rock specimen was examined. The rock specimen is granite rock, has natural Y-type fractures intersection. A solution of Methyl-cellulose is used as high viscosity liquid. Due to the high viscosity liquid, hydraulic head could be measured in the wide range, and high viscosity liquid improved the accuracy of measurement. Laminar flow could be achieved in the rock specimen by the high viscosity liquid over 0.1wt%.
; Tetsu, Keiichi*;
JNC TN8430 2001-003, 58 Pages, 2001/03
JNC-TN8430-2001-003.pdf:10.04MB
Handling methods and test conditions of hydraulic tests for NETBLOCK system had been examined by using acrylic and/or artificial rock specimen. A natural rock specimen (granite : excavated from Kamaishi mine) with fracture intersection was formed into practicable size for NETBLOCK system. Recently, we conducted a series of hydraulic test, in order to study the influence of fracture intersection by using the natural rock specimen. Hydraulic tests were conducted under several centimeters of head, which could be controlled by improved system because hydraulic permeability of target fractures were high. As a result, 10
10
(m
/s) orders of hydraulic transmissivity of target fractures could be measured. A low permeability in the NW direction at the lower fracture was estimated from the heterogeneous head distribution. However, it is also expected that turbulence flow might be occurred under this study condition because fracture permeability is high and flow rate through the fracture is relatively high. In case of turbulence-flow, an estimated hydraulic transmissivity is low. High-viscosity fluid hydraulic test to achieve laminar flow will be needed for correcting an evaluated transmissivity.
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JNC TJ8400 2000-006, 232 Pages, 2000/05
JNC-TJ8400-2000-006.pdf:7.75MB
In this research, simulations with some parameters which characterize ground water flow and the reliability evaluation for the expansion of the calculation method of groundwater flow were carried out by using the radionuclide transport computations in nearfield heterogeneous porous media. Concretely contents are follows: (1)With the series of calculation method for three-dimensional saturated/unsaturated groundwater flow and one-dimensional radionuclide transport. the computational analyses with the parameters used in JNC report in 2000 was carried out and the influence of the different input flux was evaluated. (2)The examination of the application for the different ways of inverse laplace transformation which is used in one-dimensional radionuclide tansport analysis code "MATRICS" was carried out. (3)The examination of the application of multi-element "MATRICS" (m-MATRICS) for radionuclide transport computations in nearfield heterogeneous porous media was carried out. (4)The series of calculation methods from three-dimensional saturated/unsaturated ground water flow simulation code to one-dimensional radionuclide transport simulation code was integrated.
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JNC TJ8400 2000-005, 71 Pages, 2000/05
In this research, simulations with some parameters which characterize ground water flow and the reliability evaluation for the expansion of the calculation method of groundwater flow were carried out by using the radionuclide transport computations in nearfield heterogeneous porous media. Concretely contents are follows: (1)With the series of calculation method for three-dimensional saturated/unsaturated groundwater flow and one-dimensional radionuclide transport, the computational analyses with the parameters used in JNC report in 2000 was carried out and the influence of the different input flux was evaluated. (2)The examination of the application for the different ways of inverse laplace transformation which is used in one-dimensional radionuclide transport analysis code "MATRICS" was carried out. (3)The examination of the application of multi-element "MATRICS" (m-MATRICS) for radionuclide transport computations in nearfield heterogeneous porous media was carried out. (4)The series of calculation methods from three-dimensional saturated/unsaturated ground water flow simulation code to one-dimensional radionuclide transport simulation code was integrated.
Esaki, Tetsuro*; Jinno, Kenji*; Mitani, Yasuhiro*; ; Uchida, Masahiro;
JNC TY8400 2000-004, 94 Pages, 2000/03
JNC-TY8400-2000-004.pdf:7.73MB
no abstracts in English
Imai, Hisashi; Yanagizawa, Koichi
PNC TN7410 90-026, 29 Pages, 1990/12
In order to develop the methodology and equipment for hydrogeological investigation, a study on regional groundwater flow has been carried out by PNC (Power Reactor and Nuclear Fuel Development Corporation) around the Tono area located in the southeast of Gifu prefecture, central Japan. Within this study, three kinds of analytical study concerning the three dimentional groundwater flow are being carried out; (1)Regional groundwater flow analysis in the area of 10 kilometers square with 1000 meter depth. (2)Local groundwater flow analysis around the experimental shaft to examine the effect of shaft excavation in the area of 300 meters square with 300 meter depth. (3)Also effect analysis on the groundwater flow considering the relaxation of rock mass due to the shaft excavation in the restricted small area of 20 meters with 50 meters depth. According to the above study of groundwater flow analysis, the properties of developing analytical code of TAGSAC (Three Dimentional Analysis of Groundwater Flow, Saitama University Code) using FEM method under saturated or unsaturated condition are presented by following fivefold; (1)The utility background of TAGSAC (2)The analysis examples by TAGSAC (3)The governing equation used in TAGSAC and the handling of the equation in unsaturated condition (4)The problems and improving plan for TAGSAC (5)The programme source of TAGSAC
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JAERI-M 87-142, 17 Pages, 1987/09
no abstracts in English
Sakai, Akihiro
no journal, ,
no abstracts in English
Dan, Hanae*; Motoshima, Takayuki*; Kimura, Shun; Takeda, Masaki
no journal, ,
no abstracts in English
Dan, Hanae*; Motoshima, Takayuki*; Kimura, Shun; Takeda, Masaki
no journal, ,
no abstracts in English
Atsumi, Hiroyuki*; Masumoto, Kazuhiko*; Ishii, Tomoko*; Jo, Mayumi*; Nakayama, Masashi; Ono, Hirokazu
no journal, ,
In the vertical disposal concept of high level radioactive waste, it is important to evaluate influence of the groundwater inflow into the disposal pits against performance of buffer material as an artificial barrier because the inflow might cause the erosion of buffer material. The target of this study was to estimate the inflow control technique (e.g. grouting) around the disposal pits using numerical analysis. The model for the simulation should be a discrete fracture network model when the groundwater mainly flows along the fractures in the rock mass, therefore, the discrete fracture network model was selected to estimate the inflow control technique in this study. The results of numerical flow analysis showed that the effectiveness of grouting for the disposal pits and the impact of grouting for the other disposal pits or surrounding disposal tunnel could be evaluated quantitatively.