Useful insights on nuclear safety are provided by the level 2 probabilistic risk assessment (PRA), which evaluates the risk of fission products (FP) released in the environment during an accident in nuclear power plants (NPPs). The containment event tree method is generally employed for level 2 PRA. In this method, the accident scenarios are expressed by the combination of a number of branch points. The possible accident scenarios are approximately or representatively dealt with in this method. Dynamic PRA can evaluate the accident risk with complex changes or composition of various accident events dynamically. A reasonable source term evaluation method, which can be conducted with a small computational load, is developed for the establishment of dynamic PRA method focused on the risk of the release of FP in the environment. The proposed study aims to develop a reasonable source term evaluation method by applying phenomenological relationship diagram (PRD) method applicable to the dynamic PRA is developed.

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