The Contracting Parties to the Paris Convention on Third Party Liability in the Field of Nuclear Energy (CPPC) met in person and online on 7 and 8 April 2026 with 18 participants from 8 CPPCs. The meeting was organised in two parts, with a special session held on 7 April and a plenary session held on 8 April.
During the special session, the NEA Expert Group on Nuclear Installations for the Decay Storage of Certain Types of Low-level Short Lived Radioactive Waste (EGDS) presented its explanatory report on the relevance of excluding nuclear installations for the decay storage of certain types of solid low-level, short lived radioactive waste from the scope of application of the Paris Convention. The Working Group on the Conditions to Call Upon the Supplementary Funds Pursuant to the Brussels Supplementary Convention (WG on the BSC Third Tier) also presented its explanatory note on the conditions to monitor the exhaustion of the first and second tiers of the Brussels Supplementary Convention, drawing on specific scenarios to support discussion.
During the plenary session, the CPPCs provided updates on their respective national legislative and administrative processes, financial securities and other actions related to the implementation of the Paris Convention and the Brussels Supplementary Convention. Moreover, the United Kingdom reported on its accession to the Convention on Supplementary Compensation for Nuclear Damage (CSC), which entered into force for the United Kingdom on 1 January 2026.
The Secretariat also reported on ongoing work related to the CPPCs, including the application of the Paris Convention to nuclear incidents occurring or nuclear damage suffered on the high seas or in international airspace, as well as notes prepared on Paris Convention-related questions raised at meetings of the International Expert Group on Nuclear Liability (INLEX). An update on the activities of the NEA Working Group on Fusion and the Possibility of its Inclusion within the Scope of the Paris Convention was also provided.
Further discussions addressed the reciprocity principle under Article 2(a)(iv) of the Paris Convention, with an aim of advancing the CPPCs’ work towards a common understanding of the criteria governing its application.
A total of 16 countries are parties to the Paris Convention, covering 92 operating reactors and 6 under construction out of a total of 415 operating reactors worldwide and 72 under construction. Of those countries, 13 are also parties to the Brussels Supplementary Convention.
