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Saturday, October 17, 2020 | History

3 edition of Performance of engineered barriers in deep geological repositories. found in the catalog.

Performance of engineered barriers in deep geological repositories.

Performance of engineered barriers in deep geological repositories.

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  • 38 Currently reading

Published by International Atomic Energy Agency in Vienna .
Written in English

    Subjects:
  • Radioactive waste disposal in the ground -- Environmental aspects,
  • Sealing (Technology)

  • Edition Notes

    SeriesTechnical reports series,, no. 342, Technical reports series (International Atomic Energy Agency) ;, no. 342.
    ContributionsInternational Atomic Energy Agency.
    Classifications
    LC ClassificationsHD9698.A1 I6 no.342, TD898.2 I6 no.342
    The Physical Object
    Pagination79 p. :
    Number of Pages79
    ID Numbers
    Open LibraryOL916409M
    ISBN 109201038925
    LC Control Number95212984
    OCLC/WorldCa27313993

    The deep geological repository concept involves the encapsulation of used nuclear fuel in long-lived engineered casks which are then placed and sealed within excavated rooms in a naturally occurring geological formation at a design depth of to metres below ground surface. It involves the construction of a vault within stable, low permeability bedrock using conventional mining methods. Abstract A site specific evaluation of geological barriers is required for landfills and waste repositories. The waste-repository-rock system has to be taken into consideration for this. Since the geotechnical barrier in conjunction with geological barriers contributes considerably to long-term isolation of the harmful substances from the biosphere, it is absolutely necessary to use.

    repository system, which consists of a series of man made and natural safety barriers. Engineered barriers are used to enhance natural geological containment in a variety of ways. They must complement the natural barriers to provide adequate safety and necessary redundancy to the barrier system to ensure that safety standards are met. The geological situation at the Grimsel rock laboratory (fractured, water-bearing and homogeneous rock zones) offers ideal conditions for carrying out a wide range of experiments. Today, the focus is on the performance and safety of the engineered and geological barriers of a deep repository.

    CHARACTERIZATION OF SWELLING CLAYS AS COMPONENTS OF THE ENGINEERED BARRIER SYSTEM FOR GEOLOGICAL REPOSITORIES IAEA-TECDOC Characterization of as a component of the EBS of a deep geological repository. Internet web sites referred to in this book and does not guarantee that any content on such web sites is, or will remain, accurate. U.S. Public Law 97–, the Nuclear Waste Policy Act of , provides for the deep geologic disposal of high-level radioactive waste through a system of multiple barriers. These barriers include engineered barriers designed to prevent the migration of radionuclides out of the engineered system, and the geologic host medium that provides an additional transport barrier between the.


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Performance of engineered barriers in deep geological repositories Download PDF EPUB FB2

Description. This report describes the performance of certain types of engineered barriers, e.g. backfills for excavated areas, buffers between the waste container and the host rock, and seals for boreholes, shafts and drifts, in a deep geological repository system for the disposal of high level radioactive wastes.

Get this from a library. Performance of engineered barriers in deep geological repositories. [International Atomic Energy Agency,;]. Repositories for the disposal of radioactive waste generally rely on a multi-barrier system to isolate the waste from the biosphere. This multi-barrier system typically comprises the natural geological barrier provided by the repository host rock and its surroundings and an engineered barrier system (EBS).

The primary purpose of the present work was to qualitatively evaluate the relevance of microbial activity for the long-term performance of a deep geological repository for high-level radioactive waste and spent nuclear fuel utilizing clay and to identify which safety-relevant processes and properties can be potentially influenced by this activity.

Investigation of the swelling pressure of compacted bentonite is of great importance in evaluating the performance of the engineered barrier system in deep geological repositories for disposal of high-level radioactive by: 7.

The lifetime of the engineered barrier system used for containment of high-level radioactive waste will significantly impact the total performance of a geological repository facility.

Currently two types of designs are under consideration for an engineered barrier system, single engineered barrier system and multiple engineered barrier system.

Bentonite clay is a component of an engineered barrier system that is highly compacted around nuclear waste bundles in deep geological repositories (DGR).

The bentonite is subject to both thermal and hydraulic gradients that may cause the barrier system to fail, compromising the stability of the deep geological repository. Geological disposal is the preferred option for the final storage of high-level nuclear waste and spent nuclear fuel in most countries.

The selected host rock may be different in individual national programs for radioactive-waste management and the engineered barrier systems that protect and isolate the waste may also differ, but almost all programs are considering an engineered barrier.

In the deep geological repository, a series of engineered and natural barriers will work together to contain and isolate used nuclear fuel from the environment.

The performance of the repository will be monitored during placement operations and during an extended postclosure period. Deep Geological Disposal of Radioactive Waste presents a critical review of designing, siting, constructing and demonstrating the safety and environmental impact of deep repositories for radioactive wastes.

It is structured to provide a broad perspective of this multi-faceted, multi-disciplinary topic: providing enough detail for a non-specialist to understand the fundamental principles. The presence of several barriers serving complementary safety functions enhances confidence that radioactive waste placed in deep geological repositories will be adequately isolated and contained to protect human health and the environment.

The barriers include the natural geological barrier and the engineered barrier system (EBS). Thermal properties of engineered barriers for a Canadian deep geological repository. Pedram Abootalebi, a Greg Siemens* b.

a Royal Military College of Canada, Kingston, ON K7K 7B4, Canada. b GeoEngineering Centre at Queen’s–RMC, Department of Civil Engineering, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada.

The long-term disposal of radioactive wastes in a deep geological repository is the accepted international solution for the treatment and management of these special residues.

The microbial community of the selected host rocks and engineered barriers for the deep geological repository may affect the performance and the safety of the radioactive waste disposal.

The basic idea of geologic disposal is to place carefully packaged radioactive materials in tunnels deep underground. To achieve this, the Yucca Mountain repository would utilize a mixture of natural and engineered barriers to isolate the waste from the surrounding environment.

The performance of salt as a host rock for a repository over million-year timescales has been investigated for the potential site for a geological repository at Gorleben in Germany. The main threat towards the stability of a natural salt barrier is its high solubility.

Performance assessments are an essential element of a safety case 6 for geological radioactive waste repositories and demonstrate that safety relies on the defence-in-depth principle provided by. The disposal of spent nuclear fuel and other high-level radioactive waste in deep horizontal drillholes is an innovative system.

Canisters of highly corrosion-resistant nickel-chromium-molybdenum (Ni-Cr-Mo) alloys are specified for the disposal of this nuclear waste.

The canisters are emplaced along a steel casing in a horizontal drillhole that is one to three kilometers deep into or below a. Waste Deep Geologic Repositories. 11/30/82 6/15/83 9/30/83 2 Review of Technical Documents for Engineered Barriers Evaluation in High Level Nuclear Waste Deep Geologic Repositories.

3 Engineered for a High Repository Barriers Systems Design Level Nuclear Waste in Deep Basalts. 3/4 Evaluation of Engineered Barrier Design and Performance of a High. The swelling pressure of compacted bentonite under complex thermo-chemical conditions is a critical safety parameter of the engineering barrier system for a deep geological repository.

Engineered Barrier Systems and the Safety of Deep Geological Repositories [electronic resource]: State-of-the-art Report Understanding controls on the performance of engineered barrier systems in repositories for high-level radioactive waste and spent fuel.

A deep geological repository is a way of storing toxic or radioactive waste within a stable geologic environment (typically m deep).

It entails a combination of waste form, waste package, engineered seals and geology that is suited to provide a high level of long-term isolation and containment without future maintenance.Bentonite is a key component in many geological repositories.

The objective of the BEACON project is to develop and test the tools necessary for assessment of the hydro-mechanical evolution of an installed bentonite barrier and its resulting performance.Simulations of deep geologic disposal of nuclear waste in a generic shale formation showcase Geologic Disposal Safety Assessment (GDSA) Framework, a toolkit for repository performance assessment (PA) whose capabilities include domain discretization (Cubit), multiphysics simulations (PFLOTRAN), uncertainty and sensitivity analysis (Dakota), and visualization (Paraview).