IDENTIFYING KEY FACTORs AFFECTING A TEAM DECISION-MAKING TASK BASED ON THE ANALYSIS OF INVESTIGATING REPORTS ISSUED FROM DIVERSE INDUSTRIES

摘要

After the Fukushima accident, the scope of humanreliability analyses (HRAs) enlarged from the support ofLevel 1 PSA concerning the contribution of humanoperators in terms of preventing core damage to thesupporting of Level 2 PSA, which focuses on the role ofhuman operators mitigating the consequence of coredamage. The change of such scope means that an HRAmethod that allows us to quantify the human errorprobabilities (HEPs) of human failure events included insevere accident management guidelines is necessary (i.e.,Level 2 HRA). However, it is highly questionable thatexisting HRA methods are directly applicable to Level 2HRA, especially the quantification of HEPs related todecision-making tasks under severe accident conditions.For this reason, the authors proposed 34 factors that areclosely related to the performance of a team decisionmakingmaking task was proposed from the intensivereview of existing literature. In this paper, the catalog ofkey factors were identified from the analysis ofinvestigation reports issued from diverse industriesincluding the nuclear industry, railway systems, andaviation industry. Based on these key factors, variouskinds of event reports issued from diverse industries wereanalyzed. As a result, it is expected that a couple offactors that are significantly involved in the performanceof the decision-making tasks can be soundly picked out.From the development of a Level 2 HRA method, thecatalog of key factors plays an important role inestimating the HEP of a decision-making task beingincluded in SAMGs.