Fabrication Drawings of Fuel Pins for FUJI Project among PSI, JNC AND NRG -Revised Version 2-

; Nakazawa, Hiroaki; ; Nagayama, Masahiro*

JNC TY8410 2002-002, 46 Pages, 2002/10

JNC-TY8410-2002-002.pdf:0.18MB

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Study on the system development for evaluating long-term alteration of hydraulic field in Near Field

Okutsu, Kazuo*; *; Takamura, Hisashi*; Hane, Koji*; Takase, Hiroyasu*; DAVID SAVAGE*; Inagaki, Manabu*

JNC TJ8400 2002-032, 115 Pages, 2002/02

JNC-TJ8400-2002-032.pdf:1.28MB

For the high performance evaluation of reliability of TRU waste repository, the system development for evaluating long-term alteration in consideration of the changes action of barrier materials of hydraulic field in Near Field is required. In this research, system development for evaluating long-term alteration of hydraulic field in Near Field was examined. Examination of the basic specification of chemical/dynamic alteration action analysis system used as the composition element of this system and a whole system were performed. The research result of this year is shown below. (1)The system by which the chemical changes happened by Near Field as influence of the exudation liquid from cement material are evaluated was examined. In this year, document investigation about the various processes about chemical alteration and extraction of a choice, presentation of the uncertainty about a model or data, preliminary modeling, a simple analysis tool creation and sensitivity analysis, extraction of the process which should be taken into consideration in a system valuation modeling and a phenomenon analysis model, and a corresponding mathematics model, optimization of the software composition for development of a system valuation modeling, the exercise by the preliminary system analysis model, the experiment plan for the corroboration of a model were shown. (2)In consideration of change of the physical characteristic accompanying chemical alteration of bentonite material and cement material, the system by which the dynamic changes action of repository is evaluated was examined. In this year, arrangement of the dynamics action of repository for long-term were shown. Extraction of a phenomenon made applicable to evaluation was shown. And the dynamic models were investigated and the prototype of the dynamics model that can take into consideration the characteristic of bentonite material was shown. And the basic composition of a dynamic changes action analysis system was shown.

Study on the alteration of hydrogeological and mechanical properties of the cementitious material

*; Owada, Hitoshi*; Fujita, Hideki*; *; *; Yokozeki, Kosuke*; *

JNC TJ8400 2002-029, 79 Pages, 2002/02

JNC-TJ8400-2002-029.pdf:1.58MB

We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or leaching as the fundamental data for the evaluation in "Study on the system development for evaluating long-term alteration of hydraulic field in Near Field" that had been carried out separately. The results in this year are shown below. (1)Hardened cement paste specimens with W/C=85% and 105% were altered and characterized after permeation. Permeability of altered part was increased, as permeated water increased. Porosity was increased at the upper part of altered specimens, and compressive strength that means the properties from altered part of specimens were decreased after water-permeation. Adequate correlations are estimated between compressive strength and porosity, permeability, Vickers hardness. From the chemical properties, it is presumed these physical changes were caused by dissolution of portlandite. (2)Hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated. As a result, after 12 weeks, porosity was increasing and Vickers hardness was decreasing at the altered area. And the water permeability and the compressive strength at the deteriorated area were simulated from relations between water permeability, compressive strength, porosity, Vickers hardness and leaching ratio of calcium. These results suggest that two methods (permeation and leaching) make up for fault of each other. It is necessary to prepare additional data, to clarify the relations between each alteration factor.

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Kubota, Shigeru*; Noda, Masaru*; Toida, Masaru*; *

JNC TJ7400 2001-005, 290 Pages, 2001/03

JNC-TJ7400-2001-005.pdf:8.83MB

no abstracts in English

Design research about geological disposal facility (II)

Horita, M.*; *; Okutsu, Kazuo*; Yamamoto, Takuya*; Amemiya, Kiyoshi*

JNC TJ8400 2000-022, 303 Pages, 2000/02

JNC-TJ8400-2000-022.pdf:10.42MB

This report gives supplementary information and discussions on issues of the high-level waste geological disposal study. The following subjects are discussed ; (1)Evaluation of the effects of coefficient of lateral pressure to the specifications of disposal facilities (2)Functional development of remote operational machinery (3)Arrangement of basic data on cost estimation for disposal (4)Understanding of engineering countermeasures to potential phenomena deep under the ground (5)Selection of construction technologies (6)Establishment of the disposal concept under the coasts. For the coefficient of lateral pressure equal to 2, the cross section of disposal drift, the disposal drift spacing, the waste package pitch in the disposal drift and the specification of supporting system are designed. They are compared with those for the case of coefficient of lateral pressure equal to 1. In the case of coefficient of lateral pressure equal to 2, total length of drifts is 1.5 times, and total excavation volume is 1.8 times larger than later case. For the sealing, transportation and emplacement equipment for waste, technology of the fundamental function, remote operation, accidental events and countermeasures are discussed. The plan for developments on those items is proposed. The item of the cost for the construction, operation, and backfilling are discussed. The surface facilities, and, worker arrangement plan are proposed. For the potential phenomena encountered deep under the ground, the countermeasures are investigated form the construction experience, and the future research subjects are discussed for the underground research laboratory. For the construction technologies, the experience of construction management for the tunnel is investigated, and, the research subjects are proposed. For the disposal concept under coasts, rock condition, design condition, construction management, and quality control are compared with the disposal concept under the ground. The ...

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PNC TJ1449 98-002, 398 Pages, 1998/02

PNC-TJ1449-98-002.pdf:17.54MB

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*; Fukazawa, E.*; Horita, M.*; Kubota, Shigeru*

PNC TJ1449 97-005, 207 Pages, 1997/03

PNC-TJ1449-97-005.pdf:8.5MB

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PNC TJ1449 97-003, , 1997/03

PNC-TJ1449-97-003.pdf:18.11MB

no abstracts in English

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Yoshioka, Naoya*; Tsuchihara, H.*; Horita, M.*; Kinoshita, Naoto*

PNC TJ1449 96-007, 349 Pages, 1996/03

PNC-TJ1449-96-007.pdf:13.22MB

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Imai, Hisashi*; Amemiya, Kiyoshi*; Nishida, Kaoru*; Lin, Weiren*; *; Senna, Shigeki*

PNC TJ1449 96-005, 76 Pages, 1996/03

PNC-TJ1449-96-005.pdf:2.36MB

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