Figures - Tables

European Union

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Nuclear energy and safety
Environment policy and protection of the environment

Sujets

• Sciences et techniques

Informations

• Publié par: EUROPEAN-UNION
• Nombre de lectures: 28
• Langue: English
• Poids de l'ouvrage: 2 Mo

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7 ¿'
Commission of the European Communities
uclear science
nd technology
A feasibility study for the design of a
simulated radioactive waste repository facility
% Volume 2
Figures - Tables
Report
EUR 10848 EN/II Commission of the European Communities
nur' ir science
and technology
A feasibility study for the design of a
simulated radioactive waste repository facility
Volume 2
Figures - Tables
Mott, Hay & Anderson
Consulting Engineers
20-26 Wellesley Road
Croydon Surrey CR9 2UL, United Kingdom
Final report
This work has been carried out under cost-sharing contract
No 349-83-7 WASUK with the European Atomic Energy
Community in the framework of its R&D programme on
'Management and storage of radioactive waste',
Sheet 7 'Storage and disposal in geological formations'
Directorate-General PARL EUROP. Bibiioth.
Science, Research and Development
N.C.,
r7Vr
1987 ^-"EUR 10848 EN/II Published by the
COMMISSION OF THE EUROPEAN COMMUNITIES
Directorate-General
Telecommunications, Information Industries and Innovation
Bâtiment Jean Monnet
LUXEMBOURG
LEGAL NOTICE
Neither the Commission of the European Communities nor any person acting on
behalf of then is responsible for the use which might be made of the
following information
ISBN 92-825-7204-8 (Volume 1)
ISBN 92-825-7206-4 (Volumes 1 + 2)
Cataloguing data can be found at the end of this publication
Luxembourg: Office for Official Publications of the European Communities, 1987
ISBN 92-825-7205-6 Catalogue number: CD-NB-10848-EN-C
© ECSC-EEC-EAEC, Brussels · Luxembourg, 1987
Printed in Belgium A FEASIBILITY STUDY FOR THE DESIGN OF A SIMULATED
RADIOACTIVE WASTE REPOSITORY FACILITY
SUMMARY
The great majority of published concepts for the disposal of
heat generating radioactive waste envisage the emplacement of
waste packages in boreholes backfilled with an engineered material
described as the buffer. The need for a full scale experimental
programme to investigate buffer placement and performance was
identified, and this report describes the first stage in the
development of that programme. The nature of candidate buffer
materials and the factors defining their behaviour have been
reviewed and the nature of a buffer material selection and testing
programme have been outlined. The properties of crystalline rocks,
saliferous formations and clay host materials have been reviewed
and the complex interactions between them have been identified.
The difficulty of modelling these properties and the interaction
between buffer and host materials has been discussed and the
instrumentation requirements for measuring this interaction have
been outlined. A limited amount of thermomechanical analysis has
been performed to give a preliminary indication of the parameters
of major significance in selection of instrumentation and
modelling materials. It has been concluded that a complete
simulation of host material properties is not presently viable,
although it may be attainable for some crystalline rock types.
Alternative strategies for assessment of the host/buffer interaction
are suggested. FIGURES
1 -INDEPENDENT FUNCTIONS
restrict or prevent the flow of
groundwater towards or away from
the waste units
retain radionuclides by adsorption
or precipitation
provide long-term security against
human access
INTERACTIVE FUNCTIONS
Involving interaction« Involving interactions
with the host rock with the waste units
transmit heat from high-level waste remove heat from high-level waste
units into the host rock units so as to prevent unacceptable
increase in glass temperature
prevent the development of prefe­
inhibit the corrosive action of rential groundwater flow paths in
the rock by sealing off areas of groundwater in the vicinity of the
poor ground and reducing the per­waste units
meability of disturbed or fissured
zones provide physical support to prevent
displacement or the development of
provide structural support where undesirable stress concentrations
necessary to ensure the long-term
stability of the surrounding rock
FIG 1
The role of the backfilling and sealing system
(After Ref 31 )
- 3 -SOIL STRENGTH CLASSIFICATION
103 0-1 10 10¿
MN/m2 Compressive Strength
'y.A- Crystalline rocks
'-!&| Saliferous rocks
J C Plastic Clays
FIG 2
Outline comparison of typical strengths and stiffnesses of potential host rocks