Jaslovské Bohunice, A1 plant, KS 150 reactor accident

The location
.

The 1961 accident
.

It was a Level 4 INES Scale event.

Links

 * 1) https://en.wikipedia.org/wiki/International_Nuclear_Event_Scale
 * 2) https://www.iaea.org/Publications/Factsheets/English/ines.pdf