A systematic selection of counter operation procedures in an unexpected situation

The tasks of operators in an emergency situation are to identify the event, plan a counter measure to minimize the influence of the event and control the plant condition to become a normal one. If the event is supposed, operators can focus on selecting a suitable counter operation procedure from emergency operation procedures, severe accident management guidelines, etc. and following the selected procedure to settle the event. However, if the event is not included in a list of supposed events, operators should set a goal of counter measure and plan a suitable counter operation procedure by themselves. The authors propose a technique to generate plausible counter operation procedures based on a functional model and its applicability is demonstrated by some case studies. However, there remain some topics to be challenged. The selection of suitable counter operation procedure is one of the topics. This is usually conducted by the consideration of system, material, human, and information resources. System resources include devices and systems used for counter operations. Material resources include water to cool reactor systems and electricity and fuels to work devices and systems. Human resources include staffs and their skills and supplemental personnel dispatched. This paper proposes a systematic selection technique of counter operation procedures by especially considering system and material resources. The applicability of the proposed selection technique is demonstrated by a case study of an accidental situation.