In nuclear energy: an emergency in which there is, or is perceived to be, a hazard due to: (1) the energy resulting from a nuclear chain reaction or from the decay of the products of a chain reaction; or (2) radiation exposure [Section 5(dd), Philippine National Nuclear Energy Safety Act of 2025]
Note: The term is alternatively referred to as radiological emergency [Section 5(dd), Philippine National Nuclear Energy Safety Act of 2025]