In this study, a probabilistic risk assessment method was developed based on the Formal Safety Assessment Guidelines approved by the IMO, applying the Baysian Network to take human factors into account. And then, based on this risk assessment method, we estimated the contribution of safety measures to human factors and evaluated the effectiveness of Risk control option. As a practical example of application, we conducted a risk assessment of a collision accident involving a medium- to large-size vessel in the Seto Inland Sea, and examined the effectiveness of several risk control options that have been considered effective as safety measures.
