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Report No.

New AESJ thermal-hydraulics roadmap for LWR safety improvement and development after Fukushima accident

Nakamura, Hideo  ; Arai, Kenji*; Oikawa, Hirohide*; Fujii, Tadashi*; Umezawa, Shigemitsu*; Abe, Yutaka*; Sugimoto, Jun*; Koshizuka, Seiichi*; Yamaguchi, Akira*

The Atomic Energy Society of Japan developed a New Thermal-Hydraulics Safety Evaluation Fundamental Technology Enhancement Strategy Roadmap (TH-RM) for LWR Safety Improvement and Development after Fukushima-Daiichi Accident through collaboration of utilities, vendors, universities, research institutes and technical support organizations for regulatory body. The revision has been made by three sub working groups (SWGs), by considering the lessons learned from the Fukushima-Daiichi Accident. The safety assessment SWG pursued development of safety assessment computer codes. The fundamental technology SWG pursued safety improvement and risk reduction via improved accident management measures by referring the technical map for severe accident established by severe accident SWG. Twelve important subjects have been identified, and Fact Sheet was developed for each of subjects for research and development. External hazards are also considered how to cope with from thermal-hydraulic safety point of view. This paper summarizes the revised TH-RM with several examples and future perspectives.



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