ON THE USE OF FAULT AND DECISION TREE ANALYSES TO PROTECT AGAINST INDUSTRIAL SABOTAGE

Fault tree and decision tree analyses provide systematic bases for evaluation of safety systems and procedures designed to protect the public from accidents at power reactors^ and nuclear fuel reprocessing plants2. Heuristically, this paper shows applications of these methods for industrial sabotage analysis at a reprocessing plant. Fault trees are especially useful for analyzing passive plant protection. Here, they are constructed by \"leak path\" analysis which has the advantage of achieving completeness through path inventory. The escape fault tree is readily developed by this method and using the reciprocal character of the trees, the attack fault tree is constructed. After construction, the events on the fault tree are corrected for their non-reciprocal character. The fault trees are algebraically solved and the protection that is afforded is ranked by the number of barriers that must be penetrated. No attempt is made here to assess the barrier penetration probabilities or penetration time duration.