OKLO Working Group

Directorate-General For Research And Innovation European Commission

Description

Proceedings of the third joint EC-CEA progress meeting held in Brussels on 11 and 12 October 1993
Nuclear energy and safety

Informations

• Publié par: DIRECTORATE-GENERAL-FOR-RESEARCH-AND-INNOVATION-EUROPEAN-COMMISSION
• Nombre de lectures: 15
• Langue: English
• Poids de l'ouvrage: 11 Mo

Extrait

ISSN 1018-5593
European Commission
OKLO Working Group
Proceedings of the third joint EC-CEA progress meeting
held in Brussels on 11 and 12 October 1993
rara»
Report
EUR 16098 EN/FR European Commission
and technology
OKLO Working Group
Proceedings of the third joint EC-CEA progress meeting
held in Brussels on 11 and 12 October 1993
Edited by
H. von Maravic
European Commission
Rue de la Loi 200
B-1049 Brussels
R&D programme on management and storage of radioactive waste
Directorate-General
Science, Research and Development
1995 EUR 16098 EN/FR LEGAL NOTICE
Neither the European Commission nor any person acting on
behalf of the Commission is responsible for the use which might be made of the
following information
Cataloguing data can be found at the end of this publication
Luxembourg: Office for Official Publications of the European Communities, 1995
ISBN 92-827-0149-2
© ECSC-EC-EAEC, Brussels · Luxembourg, 1995
Reproduction is authorized, except for commercial purposes, provided the source is acknowledged
Printed in Luxembourg FOREWORD
Natural Analogue studies have been carried out for several years in the frame of the
European Community's R&D programme on radioactive waste and within its recent 4th
five-year programme on "Management and Storage of Radioactive Waste (1990-1994)"
the Community is participating in the Oklo study, natural analogue for radionuclide
transport processes in a geological repository.
The Oklo project (covering the research period from 1991 to 1994) is coordinated by
CEA-IPSN (F) and involves laboratories from several CEA directorates (IPSN, DTA and
DCC) which collaborate with other institutions from France: CREGU, Nancy; CNRS,
Strasbourg and EMP, Fontainebleau. Under the umbrella of the 'Oklo Working Group',
collaboration has been established with institutions from Canada, Japan, USA and
Sweden that are taking part in the study.
The 3rd joint CEC-CEA progress meeting of the 'Oklo Working Group' was held on 11-
12 October 1993 in Brussels and gave the possibility of reviewing and discussing progress
made since its 2nd meeting in April 1992 in Brussels. The meeting focused on the
different tasks within the CEC-CEA Oklo project and further research activities of the
other participants in the Oklo study concerning (i) field survey and in-situ sampling, (ii)
characterisation of the source term, (iii) studies of the petrographical and geochemical
system ruling the ancient and recent migration system and (iv) integration of
hydrogeological and hydrochemical data into a coupled flow and transport model.
Implications of the potential role of the Oklo Natural Analogues studies to be used in
repository performance assessment has also been presented and discussed by considering
methodological aspects, geochemical transport mechanisms and waste disposal aspects.
The proceedings present the papers presented at the third progress meeting of the 'Oklo
Working Group'. A first progress report was published in 1993 under EUR 14877 EN.
H. von Maravic P.L. Blanc
(CEC) (CEA-IPSN)
III CONTENTS Page
H. von Maravic (CEC) Foreword
P.L. Blanc (CEA/IPSN)
PART I : CEC-CEA OKLO Project
OKLO, Natural analogue for a radioactive P.L. Blanc
waste repository: a summary of results (CEA/IPSN)
of the analytical phase.
Source term
15 Source term characterization : main isotopie Ph. Holliger
features and modelling of reactor zones 10 & 13. (CEA/DESD/SCS/LGCA)
Ancient geochemical migration system
31 Migration élémentaire autour des réacteurs C. Menet-Dressayre et al.
nucléaires d'OKLO (GABON). (CEA/DCQDESD/SCS)
Implications pour le stockage de déchets
nucléaires de haute activité.
Mineralogy and isotope geochemistry of clays RBros et al. 41
associated with reactors at OKLO (reactor 10) (CNRS)
and BAGOMBE.
Redox conditions and thermal history in V. Savary et al. 51
reactors 10 and 16. (CREGU)
Modelling heat and fluid transfers during J J Royer et al. 63
natural nuclear reaction in the OKLO (CRPG/UPR)
uranium deposit (GABON)
From near to far field : an attempt to L Raimbault et al. 77
reconstruct ancient fluid circulations (EMP)
around OKLO fossil reactors.
Present hydrogeologjcal and hydrochemical migration system
Hydrogeology and modelling at OKELOBONDO and I. Gurban et al. 93
BAGOMBE sites (EMP)
115 Hydrogeochemical studies at OKLO-OKELOBONDO P. Toulhoat et al.
and BANGOMBE sites. (CEA/DCC)
Analysis of colloids fromO and V.Moulin et al. 131
BAGOMBE waters. (CEA/DCC/DESD/SCS
Safety issues
Implication of OKLO studies to be used in P. Escalier des Orres 141
repository assessment (CEA/IPSN)
IV Page
Part Π : Research activities of other participants in the OKLO project
OKLO PA (Performance Assessment) Issues F. Karlsson (SKB, Sweden) 145
C. Pettersson 153
* Organic material
(Univ. Linköping, Sweden)
M. Laaksoharju 155
* Colloid material (GeoPoint AB, Sweden)
K. Pedersen 157
* Microbial studies (Univ. Göteborg, Sweden)
REE (Rare Earth Element) geochemistry of H. Hidaka et al. 159
(Univ. Tokyo, Japan) OKLO and BANGOMBE natural reactors
Heterogeneous composition and texture of B. Nagy 169
the OKLO and BANGOMBE natural fission reactors. (Univ. Ariz.,USA)
Mineralogy of the E reactor zone, Gabon J. Janeczek et al. 181
Report of preliminary results (Univ. Silesian, Poland)
Vacuum extraction of hydrogen isotopes AT. Jakubick et al. 213
from OKLO samples (Ontario Hyd­, CAN)
Geochemistry of samples from the natural S. Sunder et al. 221
fission reactors in the OKLO uranium deposits : (AECL­Research, CAN)
An XPS and XRD study
list of participants 231
V PARTI
CEC-CEA OKLO Project