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Ishijima, Yasuhiro ; Sato, Tomonori  ; Soma, Yasutaka   ; Kaji, Yoshiyuki  ; Yamashita, Shinichiro   

Japan Atomic Energy Agency (JAEA) is developing a fundamental research plan for fuel behavior analysis focusing on Cr-coated cladding tubes, a promising candidate for early implementation among Accident Tolerant Fuels (ATF). This research aims to address the challenge of understanding the effects of radiation and high-temperature water environments on the corrosion behavior of Cr coatings during the normal operation of light water reactors. Many aspects remain unclear, particularly the impact of chemical species generated by radiolysis (e.g., radicals, hydrogen peroxide, and dissolved oxygen) on Cr coating corrosion and the associated mechanisms. To tackle these issues, JAEA has established an autoclave system capable of reproducing radiolysis environments under gamma-ray irradiation in high-temperature water. Electrochemical measurements will be conducted using this system to analyze the corrosion behavior of Cr coatings. This presentation outlines the testing equipment and electrochemical testing methods, alongside the characteristics of the target environments and the associated research challenges.