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Kunimaru, Takanori; Morikawa, Keita; Tachi, Yukio; Kuno, Yoshio*; Hosoya, Shinichi*; Shimoda, Satoko*; Kato, Hiroyasu*; Nakazawa, Toshiyuki*; Ikuse, Hiroyuki*; Kubota, Masako*
JAEA-Data/Code 2012-013, 96 Pages, 2012/07
JAEA-Data-Code-2012-013.pdf:7.41MBJAEA-Data-Code-2012-013(errata).pdf:0.13MB
For the purpose to understand the relationship between characteristic of mass transport and characteristic of fracture, the following experiments were carried out using core sample, which was sampled from the -300 m Stage. This paper compiled the results of these experiment. (1) Diffusion experiments of Cs, Sr, I and uranin in granite samples (2) Sorption experiments of Cs and Sr on crushed granite (3) Measurement of pore physicality by Mercury Intrusion and water saturation
Saito, Shigeyuki*; Ikuse, Hiroyuki*
JNC TJ8400 2003-030, 54 Pages, 2003/02
(1)study on disposal condition of uranium-bearing waste. Performance of daughter nuclides in uranium-bearing disposal (into approximately-100m-depth) is estimated by investigation of differential equation. And relationship between variation of parameter and dose rate is investigated form the point of release coefficient, solubility, infiltration, water velocity, distribution coefficient (Kd), distance to river. Influence to daughter nuclides in case of shift of Kd is investigated. If Kd of daughter nuclides are smaller than that of parent nuclide, daughter nuclides may travel without radioactive equilibrium. Furthermore, the less is the distance to river, the more is maximum dose rate, when assessment duration is limited. (2)study on concentration and flux of natural radioactive elements. Concentration data of natural radionuclides and some chemical species have been examined regarding Japanese geological environment by literature survey, and the characteristics of their statistical distributions have been obtained using a method of statistical analysis. Deep considerations have been made on the characteristics and their related factors on each geological environment based on the information of chemical species and geological characteristics. Furthermore, a hypothetical methodology of an assessment of natural fluxes which reflect geological environments in Japan has been presented for a description of credibility and applicability of natural safety indicators by considering a timescale of an assessment, information of data acquisition mehtod and data accumulation, credibility of matter cycle, and differences of areas for the assessment.
Saito, Shigeyuki*; Ikuse, Hiroyuki*
JNC TJ8400 2003-029, 288 Pages, 2003/02
JNC-TJ8400-2003-029.pdf:5.15MB
(1)study on disposal condition of uranium-bearing waste. Performance of daughter nuclides in uranium-bearing disposal (into approximately-100m-depth) is estimated by investigation of differential equation. And relationship between variation of parameter and dose rate is investigated form the point of release coefficient, solubility, infiltration, water velocity, distribution coefficient (Kd), distance to river. Influence to daughter nuclides in case of shift of Kd is investigated. If Kd of daughter nuclides are smaller than that of parent nuclide, daughter nuclides may travel without radioactive equilibrium. Furthermore, the less is the distance to river, the more is maximum dose rate, when assessment duration is limited. (2)study on concentration and flux of natural radioactive elements Concentration data of natural radionuclides and some chemical species have been examined regarding Japanese geological environment by literature survey, and the characteristics of their statistical distributions have been obtained using a method of statistical analysis. Deep considerations have been made on the characteristics and their related factors on each geological environment based on the information of chemical species and geological characteristics. Furthermore, a hypothetical methodology of an assessment of natural fluxes which reflect geological environments in Japan has been presented for a description of credibility and applicability of natural safety indicators by considering a timescale of an assessment, information of data acquisition mehtod and data accumulation, credibility of matter cycle, and differences of areas for the assessment.
Ikuse, Hiroyuki*
JNC TJ6420 2003-002, 34 Pages, 2003/02
JNC-TJ6420-2003-002.pdf:4.08MB
For five samples of mill tailing which were collected in the JNC Ningyo Toge site, elution rate (ratio of 'amount eluted into water' to 'amount in soil sample') of some elements and distribution coefficient (Kd) of uranium, thorium, and radium was measured.
Saito, Shigeyuki*; Ikuse, Hiroyuki*
JNC TJ8400 2002-027, 105 Pages, 2002/02
JNC-TJ8400-2002-027.pdf:11.2MB
no abstracts in English
Saito, Shigeyuki*; Ikuse, Hiroyuki*
JNC TJ8400 2002-026, 704 Pages, 2002/02
JNC-TJ8400-2002-026.pdf:33.96MB
(1)study on disposal condition of uranium-bearing waste. Possibility of approximately-100m-depth disposal of various uranium-bearing waste (4.5% enrichment and uranium concentration of 1000 Bq/g) has been studied in order to clear the disposal condition. While exposure rate to the public is over 0.01 mSv/y if all of interested parameters are the worst case, it is less than 0.01 mSv/y only if flow rate in the river is not less than 1E9 m
/y, independent of other parameters. In this study, there is no case that exposure rate is less than 0.01 mSv/y for the limit of only one parameter except 1E9 m/y of flow rate in the river. However, less than 0.01 mSv/y is possibly expected in the following case : one is that both inhalation rate and flow rate in the river take reference values, another is that inhalation rate takes reference value and media have good adsorptivity. (2)study on concentration and flux of natural radioactive elements. A literature survey on natural elemental concentrations has been conducted. The collective state of elemental concentration data in Japan is reporterd. To construct methodology of the assessment of natural safety indicators (including flux and concentration), studies on natural geological environments and geological processes in Japan were examined. The methodology of natural safety indicators is divided into the following 6 parts; (a)Geological modeling of assessment area, (b)Gathering of concentraion (,density and radioactivity) data, (c)Research and selection of geological processes (including prosess rate data), (d)Elemental circulation modelling at assessment area, (e)Research of geological repository system and outlines of safety assessment, (f)Setting up of purpose of natural safety indicators, and presentation of the indicators. The international researches of guidelines and laws concerned with natural safety indicators and the review of reserches on the latest natural safety indicators were also examined.
Ikuse, Hiroyuki*
JNC TJ6410 2002-010, 243 Pages, 2002/02
JNC-TJ6410-2002-010.pdf:22.44MB
no abstracts in English