THE RESULTS OF A DIRECTED GRAPH AND FAULT TREE ASSESSMENT OF A MC&A SYSTEM

This paper presents an assessment of the effectiveness of the Material Control and Accounting System (MC&A) in a hypothetical nuclear facility, the TEST BED [1]. The key in assessing the TEST BED is the generation of adversary event sets. The adversary event sets are generated and analyzed by a directed graph (digraph) and fault tree procedure. Although the TEST BED is a system hardened against SNM theft, the assessment of the TEST BED finds several major weaknesses, and also indicates possible modifications to correct these weaknesses.