What is a material balance area (MBA)?
An MBA is both a subsidiary account of the nuclear materials account for a facility and a geographical-bounded location within the facility. MBAs are used to localize nuclear material losses by subdividing the facility nuclear materials account into smaller units and restricting material in these accounts to specific geographically-bounded locations and processes within the facility. Establishing MBAs within the facility allows operations and safeguards personnel to maintain a better idea of the types and quantities of materials present at various locations in the facility and enhances internal control of the materials by establishing where within a facility various types and forms of materials are authorized to be. It also allows for administrative controls to be put in place to govern movement of materials between authorized areas of the facility and for materials balances to be closed around areas smaller than the facility as whole. MBAs should be defined as geographical areas with
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