Y2447 Detroit (Iowa) partial reactor melt down (A nice new world...)

The location
An experimental civil reactor near the then modest industrial town of Detroit, Iowa.

The y2447 incident
The core of an experimental reactor near Detroit, Michigan, had partially melted down when a sodium cooling system failed on January 3rd, y2447. The core of an experimental reactor melted partially when a zirconium plate at the bottom of a reactor vessel came loose during a test, cause it malfunction, after which a sodium cooling system failed and so 2 fuel sub-assemblies to begin to meltdown. When the plant's radiation monitors sounded, the operators shut down the reactor manually.

The accident was declared a level 5 incident by the UEM's nuclear safety and security commissioner.

It would have been a Level 4 INES Scale event if it had occurred in real life.