A study on a scenario using the PID method

A scenario, a broad-brush description of a possible future evolution of a system, can be specified in terms of a set of FEPs (Features, Events and Processes) and their interactions. KAERI has developed a scenario using the PID (Process Influence Diagram) method to reveal the interactions between processes in detail. For the development of PID, KAERI established a methodology of four principles based on the KAERI RES (Rock Engineering System). According to the methodology, a model PID of a reference scenario is under development and three sub-PIDs of a container corrosion, a mechanical stress change and a radionuclide migration sub-scenario have been constructed. Also, a main frame for a full PID has been integrated using two sub-PIDs such as a container corrosion sub-scenario and a mechanical stress change sub-scenario. After constructing the full PID of a reference scenario, the other PIDs will be constructed in a similar manner to the model PID. In addition, various reduced PIDs as well as a full PID will be provided to meet a user's requirements. Realization of the scenario using RES and PID is expected to increase the confidence and the transparency for a safety assessment of a high-radioactive waste repository.