ABSTRACT
For any nuclear material, there are typically 3/4 barriers to the environment. The inner barriers may be fuel cladding or the containment flask itself. But outside these barriers, there are structures such as the concrete walls of a pond or the envelope of the building enclosure which fulfil a vital containment (or shielding) function. It is frequently the case that the structural containments have to be designed and constructed to the exacting standards mentioned earlier in the Introduction.
