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The United Kingdom’s Accession to the Convention on Supplementary Compensation for Nuclear Damage (CSC)

13 October 2025

Proposing MP
Michael Shanks Lab
Rutherglen
Type
Written Ministerial Statement
Department
Department for Energy Security and Net Zero
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At a Glance

Issue Summary

The statement discusses the United Kingdom's accession to the Convention on Supplementary Compensation for Nuclear Damage (CSC), an international nuclear third party liability treaty.

Action Requested

The UK deposited its instrument of accession with the IAEA on October 3, 2025, and the CSC will enter into force in the UK on January 1, 2026. The government has implemented necessary domestic legislation to comply with the CSC through amendments to existing laws.

Key Facts

  • On 03 October 2025, the UK deposited its instrument of accession with the International Atomic Energy Agency (IAEA).
  • The CSC will enter into force in the UK on 01 January 2026.
  • Minor technical changes were made by the Nuclear Installations (Compensation for Nuclear Damage) (Amendment) Regulations 2025.
  • At present, assuming UK membership of the convention, the shared international fund would be valued at approximately £120m, with the UK’s contribution at approximately £6.6m.
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