scope:

This Standard specifies the construction, fabrication, and installation requirements that apply to concrete containment structures of a containment system designated as class containment components, parts, and appurtenances for nuclear power plants.

This Standard provides personnel qualification requirements for the work performed in accordance with this Standard.

The interpretation of clauses depends on the correct interpretation of the words "shall", "should", and "may". "Shall" is mandatory; "should" is recommendatory; "may" is permissive.