For nuclear reactor incidents there are reinsurance pools. A collective of insurance companies. For example the nuclear reactor in Borssele, The Netherlands, is insured backed by 26 of such collectives (one national, and 25 foreign collectives) together they consist of over 300 individual insurance companies.
This particular (small) reactor is insured for liability up to 1.2 billion euro.
This particular (small) reactor is insured for liability up to 1.2 billion euro.