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