The Convention on Supplementary Compensation for Nuclear Damage (CSC) is an international nuclear liability agreement proposed by the International Atomic Energy Agency in 1997. The CSC is an international government-to-government agreement created to help support victim adjudicate claims and channel liability to reactor operators. The CSC establishes a central fund to support the cleanup of a nuclear accident, and defines who would be considered liable for damages.
CSC is open to all countries with a national law that incorporates basic principles of nuclear liability law, and which agree to contribute to an international fund to compensate victims of nuclear damage. Currently there are four countries that have ratified the CSC, Argentina, Morocco, Romania, and the United States. The CSC will enter into force on the 90th day following the date on which at least five countries with a minimum of 400,000 MWe of installed nuclear capacity ratify, accept, or approve it.
Below is a link to the full CSC text from the IAEA.