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The UK’s higher activity waste (HAW) is set to be disposed of in a geological disposal facility (GDF). International consensus is that a GDF provides the most comprehensive means of isolating and containing HAW and its harmful radionuclides, with nations at different stages in their implementation of geological disposal. The maturity of some nations’ disposal programmes (e.g. Finland, Sweden) ensures a regulatory framework for their GDF is well established. The UK is currently engaged in a GDF site selection process, as such it is necessary that the regulatory framework for the geological disposal of its radioactive waste be fully established to meet the unique challenges posed by this first-of-a-kind facility for the UK. The reduced hazard potential and unique features of the GDF may mean the existing framework applied to UK nuclear installations does not proportionately meet the requirements for maintaining worker and public safety and the protection of the environment. The purpose of the work presented in this thesis was to investigate the safety and regulatory challenges associated with the geological disposal of UK HAW. This began by building an understanding of the fundamentals of radioactive waste and geological disposal in the UK and the risks associated with geological disposal. Having investigated the performance of proposed engineered barrier materials for the GDF, a simplified, 1-dimensional risk assessment model was developed for the disposal of spent nuclear fuel (SNF) in a hypothetical geological setting. The model was verified against data provided by Radioactive Waste Management Ltd (RWM Ltd), the UK’s GDF delivery body, and utilised to conduct sensitivity studies, for the purpose of identify factors which could significantly impact on the radiological risk to the public due to the disposal of Spent Nuclear Fuel. Where significant, it was considered whether this might impact on the nature of the regulatory oversight required. The framework applied to nuclear installations in the regulation of nuclear safety, security, environmental protection and safeguards was mapped and analysed for its applicability to GDF-specific challenges. International experience in the regulation of GDFs was drawn upon in order to identify common features. Stakeholder opinion, including members of industry, regulators, waste producers and local interest groups, was also sought, in order to highlight their views on the applicability of the current system of nuclear site licensing to a GDF. This work culminated with a proposal for a regulatory framework, which aims to proportionately address the unique challenges associated with geological disposal. Open Access |
