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Tanaka, Tadao; Sakamoto, Yoshifumi; Yamaguchi, Tetsuji; Takazawa, Mayumi; Akai, Masanobu; Negishi, Kumi; Iida, Yoshihisa; Nakayama, Shinichi
JAERI-Conf 2005-007, p.105 - 110, 2005/08
Highly alkaline environments induced by cementitious materials in radioactive waste repositories are likely to dissolve and to alter montmorillonite, the main constituent of bentonite buffer materials. For the prediction of the long-term variations in permeability of compacted sand-bentonite mixtures, long-term alteration of bentonite should be quantified based on information accumulated by using the compacted or powdered bentonite materials, with batch experiments or column experiments. In this study, we summarize distinctive information obtained from various experimental systems, and propose functional and effective integration of experimental approaches to prediction of bentonite alteration.
; ; Tanai, Kenji
JNC TN8400 99-050, 94 Pages, 1999/11
This paper reports on the evaluations of operational activities for a High Level Radioactive Wastes Disposal Facility, from initial acceptance of vitrified waste at a surface facility to emplacement engineered barriers in underground facilities. The purpose of this analysis is to confirm the technical feasibility of geological disposal. First, the basic design and repository system requirements are identified. Second, operational activities in surface facilities, access facilities and underground facilities are described. The required procedures and equipment, suitable for specific emplacement concepts and configurations for engineered barrier systems are discussed for specific examples. Countermeasures for potential adverse events or conditions are based on extensive civil engineering and mining experiences in Japan and abroad. The time schedule is also evaluated on the basis of these concepts. In addition, the concept of stationary and mobile radiation control areas is studied based on experiences and practice in current nuclear facilities. Finally future research and development items are summarized.
; ; Shimizu, Kazuhiko; Miyahara, Kaname; ; Hasegawa, Hiroshi; Iwasa, Kengo
JNC TN1400 99-008, 656 Pages, 1999/04
None
Toyohara, Masumitsu*; Hirayama, Fumio*; Tamura, Toshiyuki*; Fukazawa, Takuji*; Igarashi, Noboru*
PNC TJ8164 96-010, 213 Pages, 1996/03
no abstracts in English
Amano, Hikaru
Proc. of the 5th Int. Seminar for Liquid Scintillation Analysis, p.55 - 76, 1993/00
no abstracts in English
; ; ; ; ; ; Araki, Kunio
JAERI-M 83-040, 55 Pages, 1983/03
no abstracts in English
Saito, Tatsuo
no journal, ,
RI waste is generated from the use of RI in universities, medical care, and research institutes, and from the dismantling of facilities, but it has not yet been finally disposed of for burial. Therefore, JAEA has been acting as an implementing agency for the disposal project of low-level radioactive wastes (wastes from research facilities, etc.), including RI wastes generated from research institutes, universities, and medical institutions, including JAEA. In order to obtain the understanding and cooperation of waste generators toward the early commencement of the disposal project, this report introduces the current status of the disposal of RI waste and the efforts being made for its burial.
