Workshop on Stress Partitioning in Engineered Clay Barriers, Duke University, Durham, NC., U.S.A., May 29–31, 1992: Overview

1992 ◽  
Vol 29 (6) ◽  
pp. 1011-1012 ◽  
Author(s):  
Malcolm N. Gray
Keyword(s):  
Key Words ◽  
Nuclear Fuel ◽  
Stress Partitioning ◽  
Duke University ◽  
Nuclear Fuel Waste ◽  
Clay Barriers

The accompanying text introduces a series of papers on various aspects of the use of bentonites for the storage and disposal of nuclear fuel waste. The papers were initially presented by a group of international researchers at a workshop on "Stress partitioning on engineered clay barriers" held at Duke University, Durham, N.C., in May 1991. The papers provide an excellent overview of current research on the properties and behaviour of dense, clay-rich bentonitic barriers. Key words : bentonites, nuclear fuel waste, workshop.

MICROBIAL PARTICIPATION IN IODIDE REMOVAL FROM SOLUTION BY ORGANIC SOILS

1989 ◽  
Vol 69 (1) ◽  
pp. 127-135 ◽  
Author(s):  
J. T. KOCH ◽  
D. B. RACHAR ◽  
B. D. KAY
Keyword(s):  
Gamma Irradiation ◽  
Key Words ◽  
Microbial Activity ◽  
Nuclear Fuel ◽  
Organic Soil ◽  
Organic Soils ◽  
Γ Radiation ◽  
Precambrian Shield ◽  
Biological Removal ◽  
Nuclear Fuel Waste

The migration of the long-lived nuclide 129I in the biosphere may be changed if the nuclide passes through an organic soil (organic soils often occur in topographical depressions where groundwater generally enters the biosphere). The reactivity of I and, hence, its transportability may be altered in organic soils by processes in which microorganisms participate. The aim of this study, therefore, was to test for microbial participation in these processes. Twelve samples of nine organic soils, varying widely in degree of humification and in parent vegetation, were used in this study and were collected mainly on the Precambrian Shield of Ontario. Experiments were conducted using glucose, thymol, and γ radiation (60Co) to stimulate or suppress microbial activity in the soils. The presence of glucose generally increased I− removal from solution whereas thymol depressed removal. Gamma irradiation of the soils decreased I− removal from solution in all samples, but 100 kGy terminated I− removal in only one sample. If the removal of I− from solution after exposing the soils to 100 kGy of γ radiation is termed nonbiological, the biological removal of I− from solution exceeded the non-biological in all samples but one. The natural I content of the soils was directly related to both the biologically and the nonbiologically mediated processes of I− removal from solution. We conclude that microorganisms play an important role in the processes of I− removal from solution in organic soils of the Precambrian Shield of Ontario. Key words: Nuclear fuel waste, 129I, groundwater, microorganisms, enzymes, mobility

Thermal and physical properties of candidate buffer–backfill materials for a nuclear fuel waste disposal vault

1989 ◽  
Vol 26 (4) ◽  
pp. 629-639 ◽  
Author(s):  
H. S. Radhakrishna ◽  
H. T. Chan ◽  
A. M. Crawford ◽  
K. C. Lau
Keyword(s):  
Hydraulic Conductivity ◽  
Nuclear Fuel ◽  
Waste Disposal ◽  
Management Program ◽  
Buffer Material ◽  
Backfill Materials ◽  
And Performance ◽  
Nuclear Fuel Waste ◽  
Clay Barriers ◽  
Ontario Hydro

As part of the Canadian Nuclear Fuel Waste Management Program, Ontario Hydro has, over several years, conducted research into the behaviour and performance of buffer–backfill for the proposed nuclear fuel waste disposal vault. In this paper, a review has been made of laboratory studies made at Ontario Hydro on the thermal properties, strength, hydraulic conductivity, and compactability of clay-based buffer materials. The results of this work have enabled the formulation of selection criteria for the buffer material mix for the prototype Canadian nuclear fuel waste disposal scheme. Key words: bentonites, buffer, backfill, nuclear waste disposal, thermal conductivity, clays, hydraulic conductivity, compaction, clay barriers, clay seals, shrinkage.

Perspectives on the Review of AECL's Proposal for Disposing of Canada's Nuclear Fuel Waste

1997 ◽  
Vol 506 ◽  
Author(s):  
K.W. Dormuth ◽  
P.A. Gillespie ◽  
S.H. Whitaker
Keyword(s):  
Nuclear Fuel ◽  
Environmental Assessment ◽  
Geological Disposal ◽  
The Public ◽  
Public Hearings ◽  
Points Of View ◽  
Nuclear Fuel Waste ◽  
Term Management

ABSTRACTA federal Environmental Assessment Panel has completed public hearings on the proposed concept for geological disposal of Canada's nuclear fuel waste. The Panel will make recommendations to assist the governments of Canada and Ontario in reaching decisions on the acceptability of the proposed concept and on the steps that must be taken to ensure the safe long-term management of nuclear fuel waste in Canada. It is instructive to review the background to the public hearings, to consider the issues that have been important in the public review, and to reflect on the opposing points of view presented at the hearings.

Materials Research for the Canadian Nuclear Fuel Waste Management Program

1981 ◽  
Vol 6 ◽  
Author(s):  
Donald J. Cameron
Keyword(s):  
Nuclear Fuel ◽  
Waste Disposal ◽  
Hard Rock ◽  
Technology Development ◽  
Management Program ◽  
Materials Research ◽  
Backfill Materials ◽  
Nuclear Fuel Waste ◽  
Irradiated Fuel ◽  
Selection Of

ABSTRACTNuclear fuel waste disposal research in Canada is concentrating on hard-rock disposal. The research programs concerned with the man-made components of the disposal system are reviewed. Irradiated fuel and solidified reprocessing wastes are both being researched, as are durable containers, and buffer and backfill materials. This review concentrates mainly on the more scientific aspects of the research, which contribute to the selection of preferred options for the various components of the system, and which support directly or indirectly the safety analysis of the disposal concept. Some technology development is included in the program now, and this is expected to expand as confidence in the acceptability of the disposal concept grows.

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