Tome Architecture and management of a geological repository - Andra

ContentsContentsContents...................................................................................................................................................3Table of illustrations ..............................................................................................................................71 Study approach ..........................................................................................................................131.1 The main stages since the 30 December 1991 Act.........................................................141.2 Andra’s research programme on disposal in a granite formation ..............................151.2.1 A generic study approach......................................................................................151.2.2 The support of international co-operation and mobilisation of thenational scientific community...............................................................................151.3 Tome structure.................................................................................................................162 High-level and long-lived waste (HLLL waste) .......................................................................192.1 The production of HLLL waste, study scenarios..........................................................202.2 The study considers two waste categories and spent fuel.............................................222.2.1 High-level C waste (or vitrified waste).................................................................222.2.2 Intermediate-level long-lived B waste ..................................................................222.2.3 Spent fuel ..............................................................................................................232.3 The inventory model........................................................................................................232.3.1 Choice of reference packages, nomenclature used subsequently..........................242.3.2 Number and volume of primary packages considered..........................................273 Study for the design of a repository in a granite medium ......................................................293.1 Definition of the geological repository functions...........................................................303.1.1 Functional analysis: repository design is driven by safety....................................303.1.2 Long-term safety functions of a repository...........................................................303.1.3 Waste package reception function in a reversible disposal system.......................313.1.4 Safety approach during the construction-operation-closure phase .......................323.2 The granite medium.........................................................................................................333.2.1 Granite: its properties for radioactive waste disposal ...........................................333.2.2 Variability of granites within the French geological context................................373.3 General options for the design of a repository in a granite medium...........................413.3.1 Making the most of favourable granite properties ................................................423.3.2 Design of engineered components, complementary and redundant withthe granite medium for long-term safety...............................................................443.3.3 Limiting granite disturbances by the repository ...................................................453.3.4 Adaptation of design arrangements to long-term safety functions .......................463.3.5 Integrating reversibility.........................................................................................484 General architecture of the repository in a granite medium .................................................51Dossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY3/228