The story
The first associations of insurers of the nuclear industry in Europe were founded in Sweden and England in 1955. The German Nuclear Reactor Insurance Association was founded shortly thereafter in 1957. Throughout the association's history, it has only once had to pay a claim; the claim amounted to approximately €10,000 to €15,000.
From Wikipedia’s article on German Nuclear Reactor Insurance Association, shared under CC BY-SA 4.0.3