福島第一原子力発電所事故前の津波想定における集団思考

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抄録

CAQDAS(Computer Assisted Qualitative Data AnalysiS)was conducted using testimony of the assumed tsunami heights prior to the Fukushima nuclear accident in terms of groupthink and inter-organizational relations. This study used Code Map within MAXQDA to analyze the correlations between groupthink and inter-organizational issues. As a result of this analysis, the symptoms and the defective decisions of groupthink were largely significant. However, most of the antecedent conditions and the mechanisms were insignificant. On the other hand, there were also two inter- organizational issues, “confusion in roles and responsibilities” and “a breakdown in communication and information flow,” that strongly correlated with the symptoms and the defective decisions. It can be surmised that these two factors caused groupthink in people in nuclear safety who had been involved in the assumptions about tsunami heights.