Safety functions and objective provision tree application to sodium cooled fast reactor

The Objective Provision Tree (OPT) is a methodology to ensure and document the provision of essential 'lines of protection' for successful prevention, control or mitigation of phenomena that could potentially damage the nuclear system. The OPT methodology has been developed mainly by International Atomic Energy Agency (IAEA) and the application of OPT methods to development of new reactors such as GEN IV was strongly recommended by GEN IV International Forum (GIF) Risk and Safety Working Group (RSWG). Examples of OPT applications during new reactor design can be found in reference and. We are developing draft OPT for KALIMER, sodium cooled fast reactor(SFR) developed by Korea Atomic Energy Research Institute (KAERI). The OPT is normally developed by designer to confirm the safety function design but we will use the developed OPT in developing the specific safety requirement. This paper presents our preliminary results and concepts about this topic