Geological Isolation Research and Development

Chapter I : Introduction

1.1 Objectives

1.2 Content and structure of Supporting Report 2

References

Chapter II : Basic concept of the engineered barrier system and disposal facility

2.1 Basic safety concept

2.1.1 Concept of geological disposal in Japan

2.1.2 The geological disposal system and its functions

2.1.3 Measures to be taken

2.2 The engineered barrier system and disposal facility

2.2.1 The engineered barrier system (EBS)

2.2.2 The disposal facility

References

Chapter III : Basic design methodology and design conditions

3.1 Basic design methodology

3.2 Factors influencing the design

3.2.1 Specifications, heat production and radioactivity of the vitrified waste; storage and cooling periods; scale of the disposal facility

3.2.2 Geological environment

3.2.3 Disposal depth

References

Chapter IV : Repository design

4.1 Design and manufacture of engineered barrier system

4.1.1 Overpack

4.1.2 Buffer

4.1.3 Investigation of alternative engineered barrier system concepts

4.2 Design of the disposal facility

4.2.1 Principles for design of the disposal facility

4.2.2 Disposal tunnel and waste package configuration geometry

4.2.3 Selection of the repository layout

4.2.4 Backfill

4.3 Evaluation of the integrity of the engineered barrier system

4.3.1 Restoration of the engineered barrier system

4.3.2 Evaluation of the mechanical stability of excavations

4.3.3 Seismic stability of the near-field

4.3.4 Evaluation of gas migration

4.3.5 Assessment of penetration of buffer material into host rock

References

Chapter V : Construction, operation, and closure of disposal site

5.1 Construction

5.1.1 Access tunnel

5.1.2 Construction of main and connecting tunnels

5.1.3 Disposal tunnels

5.1.4 Disposal pit

5.1.5 Widening methods for plug sections

5.1.6 Excavation disturbed zone

5.1.7 Countermeasures

5.1.8 Quality control

5.1.9 Concluding Remarks

5.2 Operation

5.2.1 Emplacement of the waste packages and the buffer

5.2.2 Backfilling of main and disposal tunnels

5.3 Closure

5.3.1 Backfilling of connecting tunnels

5.3.2 Backfilling of access tunnels

5.3.3 Backfilling of boreholes

5.3.4 Decommissioning of surface facilities

5.3.5 Quality control

References

Chapter VI : Technical overview of management of the disposal site

6.1 Basic principle of geological disposal and international consensus on institutional control

6.2 Basic concept of management of the disposal site

6.3 Specific management and control activities

6.4 Investigation technologies

6.5 Long-term countermeasures

References

Chapter VII : Schedule

7.1 Summary of review activities

7.2 Planning of the basic framework

7.3 Review of schedules for the construction, operation and closure periods

7.3.1 Construction schedule

7.3.2 Operation schedule

7.3.3 Closure schedule

7.4 Planning the General Schedule

References

Chapter VIII : Summary