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nuclear reactor 
Tightly sealed area where fission of the fuel is carried out in a controlled manner to release heat.
reactor building
Concrete structure surrounding the reactor vessel; it is a protective barrier against radioactivity.
pressure tube
Tube that holds the fuel bundles and circulates the coolant at a preset pressure.
reactor vessel
The core of the nuclear reactor consists of tubular spaces where fission is produced and the coolant and moderator circulate.
spent fuel storage bay
Water-filled basin where the spent fuel is stored for several years before it can be disposed of safely.
containment building
Concrete structure surrounding the reactor vessel; it is a protective barrier against radioactivity.
fuel bundle
Fuel pencils that are grouped in parallel for introduction into the reactor.
fuel pellet
Small quantity of fuel that consists of powder pressed into a sheathing tube and then inserted into the metal cladding of the pencil.
