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Analysis on isolation condenser operation by Fukushima Daiichi Unit 1 operators   KIM Man Cheol 1   1. School of Energy Systems Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, 156-756, Seoul, Korea (charleskim@cau.ac.kr)   Abstract: Fukushima Daiichi nuclear accident resulted in the core damage in three reactors and the release of considerable amount of radioactive material to the environment, not to mention significant social impact and anti-nuclear atmosphere all around the world. This paper provides a review of the findings related to shift operators' operation of the isolation condenser in Unit 1 to examine shift operators' response to the situation. Based on the review of the findings, a situation assessment model was developed to analyze shift operators’ understanding on whether core cooling was successfully performed in Unit 1 through the operation of isolation condenser. It was found that lack of information could be one of the main causes for the failure in core cooling by the IC in Unit 1. It is also recommended that the differences in the mathematical model for the situation assessment and that of the real operator need to be further investigated. Keyword: situation assessment; accident response; severe accident; Fukushima Daiichi accident
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