The term "domino effect" is usually adopted to describe the propagation of technological hazards between hazardous installation units. Since the early times of process safety, the potential hazard coming from accidents involving a "domino effect" has been recognized . The systemic definition of domino effect was given by Cozzani et al. , which is "an accident in which a primary event propagates to nearby equipment, triggering one or more secondary events resulting in overall sequences more severe than those of the primary event." Three common features of domino accidents are identified: (1) a primary accidental scenario, which activates the subsequent domino sequence; the propagation of the primary event, due to "an escalation vector" generated by the physical effects of the primary scenario, that results in the damage of at least one secondary equipment item; and (3) one or more secondary events (i.e. fire, explosion, and toxic dispersion), involving the damaged equipment items (the number of secondary events is usually the same as the damaged plant items) . In the past four decades, growing public attention has been drawn to the scientific and technical literature on the modeling and risk assessment of domino effects .