Confinement 2
Confinement 2 : Prevention or control of releases of radioactive material to the environment in operation or in accidents. Confinement is closely related in meaning to containment, but confinement is typically used to refer to the safety function of preventing the 'escape' of radioactive materials, whereas containment refers to the means for achieving that function. The Transport Regulations adopt a different distinction between confinement and containment, namely that confinement relates to preventing criticality and containment to preventing releases (See: Confinement System And Containment System). The main issue here is the differences in usage between nuclear safety and transport safety. Both terms, containment and confinement, are used in both areas (in the Transport Regulations, in the form of confinement system and containment system), and the usages of containment are (it seems) conceptually consistent, but the usages of confinement are not. Confinement in nuclear safety is the safety function that is performed by containment. A confinement system as defined in the Transport Regulations has the primary function of controlling criticality (as compared with the containment system, the function of which is to prevent leakage of radioactive material). Discussions with experts in the field have confirmed that a distinct term is needed to describe this distinct concept, and that confinement is the term that has word
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