Chernobyl disaster; Chernobyl nuclear power plant accident
Refers specifically to the 1986 nuclear accident at the Chernobyl Nuclear Power Plant. Used in historical and technical contexts.
The Chernobyl nuclear power plant accident occurred in April 1986.
Refers to the city or region; the full term specifies the nuclear accident.
From the Ukrainian city name Чорнобиль (Chornobyl) + 原子力発電所 (nuclear power plant) + 事故 (accident).