Development of a decision-making support system for the technical support center based on analysis of human performance under severe accident situation

Abstract

After the Fukushima accident, hardship of group decision making under severe accident situation is one of human factor issues emerged by Fukushima accident. After core damage, the responsibility for plant control is shifted from main control room (MCR) operators to technical support center (TSC) members who need to follow severe accident management guideline (SAMG). Decision making is necessarily required from this time to establish a suitable strategy because SAMG is not a procedure but it is a broad guideline so it cannot give a precise correct answer to TSC members for mitigating accident sequence like EOP.The developed DM support system can shorten the group DM time through a semi automatic algorithm. In addition, it is possible to gather the opinions of all members of TSC by excluding unnecessary obstructive human factors under uncertain situations like lack of information.