The boundaries of the system, which will limit the scope of the evaluation, must be clearly defined. Then the analyst must identify the system elements. The term system element is formally defined as a subsystem of the SMR; at the analyst’s discretion a system element can comprise a facility (not just a building, but a facility in the systems engineering sense), part of a facility, a collection of facilities, or transportation within the identified SMR.

Figure 9.3 System response steps.

9.3.1 Target identification and categorization

Targets are the interface between the actors and the SMR and are the basis for the definition of pathways. Clear, comprehensive target identification is an essential part of a PR or PP assessment. Targets can include nuclear or radiological material, as well as processes, equipment, and information.