We all know how enthusiastic governments are to admit fault, there are probably many more.
One I'm familiar with in the US:
"The Sodium Reactor Experiment-SRE was an experimental nuclear reactor that operated at the site from 1957 to 1964 and was the first commercial power plant in the world to experience a core meltdown.
There was a decades-long cover-up of the incident by the U.S. Department of Energy."
https://en.wikipedia.org/wiki/Santa_Susana_Field_Laboratory#...
nickik's claim was that no one has died in the US from civilian nuclear. Your links are for the Santa Susana Field Laboratory, a military experimental research facility.
If there have been any deaths from civilian nuclear, I would like that information to consider.