Consequences of the accident at the Chernobyl nuclear power plant and the organisation of safety and security at nuclear installations. Four months after the Chernobyl disaster, a delegation from the Office, the first foreign delegation allowed to visit the station, met those in charge of nuclear management in the USSR and Ukraine. Although at the time technical information was still very scarce, the parliamentarians from the Office sought to elucidate - sometimes in different ways - the circumstances and consequences of this disaster. They also set out the lessons that could be learned for France, concerning not only the lack of information during an emergency but also the organisation for monitoring the safety and security of nuclear installations. Through this report, the parliament demonstrated its interest in a technology which, while having undoubted advantages, does need to be carefully monitored and controlled by the public authorities.