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AESJ new thermo-hydraulics roadmap for LWR safety improvement based on lessons-learned from Fukushima Daiichi accident

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

The Atomic Energy Society of Japan (AESJ) developed a New Thermal-Hydraulics Safety Evaluation Fundamental Technology Enhancement Strategy Roadmap (TH-RM) for LWR Safety Improvement considering lessons-learned from the Fukushima-Daiichi Accident. Joint efforts were made by three Sub-Working Groups (SWGs) of severe accident, safety assessment and fundamental technology. The safety assessment SWG pursued development of computer codes for safety assessment concerning reactor system response including severe accident. The fundamental technology SWG pursued safety improvement and risk reduction via enhancements in accident management (AM) measures, by referring a detailed state-of-the-art information on severe accident phenomena, countermeasures and research status given from the severe accident SWG. Important technical subjects were identified by going through accident scenario in both reactor and spent-fuel pool of PWR and BWR. Work description sheets were prepared for each of identified subjects. Detailed information to cope with influences from external hazards is also summarized. The developed TH-RM is described with examples, and future perspectives are discussed.

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