What Ukrainian nuclear power manufacturer was the site of a nuclear disaster in April 1986?

The Ukrainian nuclear power manufacturer that was the site of a nuclear disaster in April 1986 is the Chernobyl Nuclear Power Plant. The disaster occurred during a late-night safety test which went wrong, leading to a reactor explosion and significant release of radioactive materials into the atmosphere. This incident is considered one of the worst nuclear disasters in history and has had lasting impacts on health, the environment, and nuclear policy globally.