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☢️ The '''Brussels Supplementary Convention''', formally known as the Convention Supplementary to the Paris Convention on Third Party Liability in the Field of Nuclear Energy, is an international treaty that establishes an additional layer of compensation for victims of [[Definition:Nuclear insurance | nuclear incidents]] beyond what is available under the 1960 Paris Convention. Adopted in 1963 under the auspices of the Organisation for Economic Co-operation and Development (OECD), the convention creates a three-tier liability and funding structure: the first tier is funded by the nuclear operator (typically backed by [[Definition:Insurance policy | insurance]] or other financial security), the second by the state in which the installation is situated, and the third by collective contributions from all contracting parties. For the insurance industry, this convention is foundational because it defines the insurable layer of nuclear liability and shapes the architecture of [[Definition:Nuclear insurance pool | nuclear insurance pools]] across participating European countries.

⚙️ Under the Brussels Supplementary Convention's framework, the nuclear operator must maintain [[Definition:Financial security | financial security]] — almost always in the form of insurance placed through national [[Definition:Nuclear insurance pool | nuclear insurance pools]] — up to the amount specified in the Paris Convention as amended. If damages exceed this operator-funded layer, the installation state contributes additional funds, and if damages exceed even that threshold, the collective fund provided by all contracting states is activated. The 2004 Protocols to both the Paris Convention and the Brussels Supplementary Convention significantly increased the compensation amounts at each tier, though ratification has proceeded slowly across signatory states. [[Definition:Underwriter | Underwriters]] participating in nuclear pools must calibrate their [[Definition:Capacity | capacity]] commitments and [[Definition:Reinsurance | reinsurance]] arrangements to align with the specific tier amounts in force in each jurisdiction, which can vary depending on which version of the protocols a country has ratified.

🌐 The convention's significance to the insurance market lies in its role as the structural blueprint for nuclear liability coverage in much of Western Europe. Countries such as France, Germany, Belgium, and the United Kingdom have historically organised their [[Definition:Nuclear insurance | nuclear insurance]] markets around the obligations flowing from this treaty framework. By contrast, the United States operates under the Price-Anderson Act — a separate domestic regime with its own layering mechanism involving private insurance and an industry-wide retrospective premium pool — while Japan's nuclear liability framework was tested and found wanting after the 2011 Fukushima disaster. The Brussels Supplementary Convention thus represents one of several competing international approaches to channelling and funding nuclear liability, and its evolution continues to influence how insurers, [[Definition:Reinsurance | reinsurers]], and governments allocate the financial burden of catastrophic nuclear risk.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Nuclear insurance]]
* [[Definition:Nuclear insurance pool]]
* [[Definition:Paris Convention on Nuclear Third Party Liability]]
* [[Definition:Liability insurance]]
* [[Definition:Catastrophe risk]]
* [[Definition:Financial security]]
{{Div col end}}

Definition:Brussels Supplementary Convention - Revision history

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