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The confinement of radioactive material in a nuclear plant is a fundamental safety function to be ensured in normal operational modes, for anticipated operational occurrences, in design-based accidents and, to the extent practicable, in selected beyond design basis accidents. This safety function is achieved by means of several barriers and means of defence. In most designs, the 3rd and 4th levels of defence are achieved mainly by means of a strong structure enveloping the nuclear reactor. This structure is called the ‘containment structure (or, simply, ‘containment’). This IDEA Safety Guide provides recommendations on the requirements for the design of containment systems for radioactive material. |