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Consequences of gas production in geological repositories

Objective

This project intends to model the overall impact of gas production in the near field and in particular on the groundwater flow, the durability of engineered barriers and on the radionuclide migration. The wastes forms will include spent fuel, vitrified wastes, medium level waste in the different rock formations, granite and salt.
This project intends to model the overall impact of gas production in the nearfield and in particular on the groundwater flow, the durability of engineered barriers and on the radionuclide migration. The wastes forms will include spent fuel, vitrified wastes, medium level wastes. The different rock formations envisaged are granite rock and salt.

2 reports have been prepared. The first corresponds to the data reference necessary for the development of the different models and particularly for the physical study of gas formation and transport. These data will evolve in function of the definition of the different scenarios and the repository concepts in the future months. The second corresponds to the listing of the different mechanisms governing gas formation. This analysis is only based on the bibliographic research and concerns the different types of waste and the different concepts considered.
Work programme:

The project is divided into four stages:

Description of processes
This step consists of identifying the mechanisms for gas formation in the different waste repositories considered in the project scenarios from bibliographic or experimental studies and establishing the common data for the development of the models and calculations. Analytical laws will be defined through this study to be integrated in the future modelling.

Analyze of gas transport mechanisms
A listing of the main phenomena involved in transport in the near-field and the host-rock will be identified and studied.

Modelling of the system
Modelling will be based on specific developments or on already existing models for the different repository conditions considered by each participant.

Calculations
Calculations will be performed for the repository conditions defined by the participants, the aim of which is to verify that engineered barriers and waste matrix are still playing their safety role in the presence of gas.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

NATIONAL RADIOACTIVE WASTE MANAGEMENT AGENCY OF FRANCE
Address
Rue Jean Monnet 1-7
92298 Chatenay Malabry
France

Participants (4)

Bertin et Cie S.A.
France
Address
59,Rue Pierre Curie 59
78373 Plaisir
EMPRESA NACIONAL DE RESIDUOS RADIOACTIVOS S.A.
Spain
Address
7,Emilio Vargas 7
28043 Madrid
Empresa Nacional de Ingeniería y Tecnología SA
Spain
Address
17,Padilla
28006 Madrid
GESELLSCHAFT FUER ANLAGEN- UND REAKTORSICHERHEIT (GRS) MBH
Germany
Address
Schwertnergasse 1
50667 Koeln