Nowhere as far as I can find.
Perhaps you are thinking of the 1986 Chernobyl steam explosion and graphite fire. This was in the USSR and although the graphite fire melted much of the core, it was not a meltdown in the usual sense associated with nuclear reactors.
chernobyl
Chernobyl, in the Ukraine, was the site of a nuclear reactor fire and radiation leak on April 26, 1986.
i think in the 1980s
south Africa
from 1945 until the 1980s, the US.since the 1980s, the USSR and now Russia.
The Chernobyl disaster
Because it was changing people's DNA
Europe
From 1945 until the late 1970s or early 1980s the United States always had the most nuclear weapons. After then the USSR/Russia has had the most nuclear weapons.
I believe its Eastern Europe was turbulent with governmental upheavals, protests, and significant changes.
Using nuclear energy is possible, and in fact being done. It has been done since the 1940s. The first nuclear electric plant came on line some time after that, but I worked at one in the 1980s.
The rave culture began in the 1980s in Europe and filtered to different parts of the world