major accident An unexpected occurrence, failure or loss beyond normal or specified levels with the potential for harming human life, property or the environment
nuclear accident An event occurring in a nuclear power plant or anywhere that radioactive materials are used, stored, or transported and involving the release of potentially dangerous levels of radioactive materials into the environment
technological accident An unexpected incident, failure or loss occurring through the application of practical or mechanical sciences to industry or commerce that poses potential harm to persons, property or the environment
