Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Shirato, Nobuaki; Ouchi, Kazutoshi; Yamazaki, Shinichi
JNC TN5400 2004-003, 1854 Pages, 2004/08
JNC-TN5400-2004-003.pdf:1.73MB
The Horonobe underground Research Laboratory (URL) programme hosted by sedimentary rocks is aimed to obtain deep geological characteristics of sedimentary rock mass and to confirm the applicability of the investigation methods for the geological environment and the engineering technology for the geological disposal described in the H12 report. In addition, the URL is aimed to have public people experience a deep geological environment in order to understand a deep geological disposal of HLW. Based on the results of the report in H13 the followings are carried out : (i)design of the section of the drifts and shafts (ii)stability analysis of the drifts and shafts considering the anisotropy of initial stress (iii)drawing of the fundamental plan (iv)refuge planning of the URL based on the estimation of gas flow (v)research planning of the second and the third stage of the URL (vi)study on construction method of the drifts and shafts (vii)planning of the facilities during construction and operation (viii)construction schedule analysis and cost estimation of the URL (ix)planning of the facility and guidance of visitors (x)closing planning of the URL This work was re-edited from the results performed by Taisei Corporation, 0bayashi Corporation, Kajima Corporation and Shimizu Corporation under contract with JNC; "Feasibility study on construction of Horonobe URL (JNC TJ1400 2002-003)".
Shirato, Nobuaki; Ouchi, Kazutoshi; Yamazaki, Shinichi
JNC TN5400 2004-002, 485 Pages, 2004/08
JNC-TN5400-2004-002.pdf:1.07MB
The Horonobe underground Research Laboratory (URL) programme hosted by sedimentary rocks is aimed to obtain deep geological characteristics of sedimentary rock mass and to confirm the applicability of the investigation methods for the geological environment and the engineering technology for the geological disposal described in the H12 report. In addition, the URL is aimed to have public people experience a deep geological environment in order to understand a deep geological disposal of HLW. The objective of this report is to make the ground of the site selection of the Horonobe URL Based on the results obtained from two deep investigation boreholes drilled in the B1 and B2 district two kinds of geological model were constructed. For each geological model four types of preliminary layout were prepared for the feasibility study. The types of the URL were as follows: (i)two shafts (ii)three shafts (iii)spiral drift and one shaft (iv)spiral drift and two shafts. For the combination of the geological model and the layout tbe construction schedule and the construction cost were estimated through the study of the construction method with the auxiliary method, the construction procedure and the cycle time. The analysis of vibration and noise during construction was also estimated. The results of the feasibility study indicated that mechanical excavation was employed for the whole construction. The shafts were suggested to be constructed by the short step sinking method and the drifts and the spiral drifts by NATM. The mucking system should be rail haulage for the drift for the case of shafts(i) and (ii)), and road haulage for the drift for the case of spiral drifts(iii) and (iv)). The estimation of construction time was around seventy months for the case of shafts(i) and (ii)) and around ninety months for the case of spiral drifts(iii) and (iv)). This work was re-edited from the results performed by Taisei Corporation under contract with JNC; "Feasibility study on ...
Yamazaki, Kazutoshi*; Takao, Hajime*; Kikuchi, Takahiro*; Kuriki, Yoshiro*; Kobayashi, Masato*; Kawakubo, Masahiro*; Shirase, Mitsuyasu*; Iwata, Yumiko*; Tochigi, Yoshikatsu*; Nakayama, Gen*; et al.
no journal, ,
Among factors affecting the corrosion behavior of carbon steel overpack, in order to consider materials (size) and realistic environmental factors which are difficult to reproduce in the laboratory scale test, engineering scale tests in the underground environment were carried out. A mock-up test of the same scale was also carried out on the ground with the aim of controlling and evaluating factors that govern the corrosion phenomenon. As a result of the test for about 3 years, there was no big difference between the average corrosion amount and the maximum corrosion amount of the simulated overpack base metal and the welded part. On the other hand, unlike the laboratory scale test, localization of corrosion due to the adhesion between the buffer material and the simulated overpack was also confirmed during the initial transient period.