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材料分野におけるナトリウム技術報告; 高温ナトリウム環境中の材料腐食・強度特性等について

Technical report on sodium technology in the field of material research; On the material corrosion and the mechanical strength in high temperature sodium

吉田 英一

Yoshida, Eiichi

高温ナトリウム環境下における材料腐食研究は、ナトリウム冷却型の高速炉開発を目的として1960年代ころから米国や欧州諸国、ロシア(旧ソ連)及び日本において本格的に進められ、多くの研究成果を成し遂げてきた。これまでに、国内ではナトリウム中材料試験技術の確立やナトリウム環境効果評価法の開発に向けて、種々のナトリウム試験装置が設計・製作され、これらの試験装置を駆使したナトリウム環境下での研究開発試験が進められてきた。今日までに多くの経験と知見が得られ、これらの成果は、実験炉「常陽」、原型炉「もんじゅ」、さらに高速炉の実用化研究開発等に反映されてきた。本報告では今後の研究開発や技術継承のために、これまでに著者が携わった経験と知見に基づき、材料分野に係るナトリウム材料試験技術と、材料特性に及ぼすナトリウム環境の影響等についてレビューした。

Corrosion research of the materials in high temperature sodium was done since 1960's in U.S., Europe, Russia and Japan for the development of sodium-cooled fast reactors, and the many excellent results were obtained. In Japan, various equipment was designed and manufactured to establish the material-testing technologies and to develop the sodium environmental effect methods. Up to present, the R&D examinations in sodium were performed using the equipment, and many experience and knowledge were obtained. The results were reflected to the experimental reactor "Joyo", the prototype nuclear reactor "Monju" and the R&D for commercial fast reactors. In this report, the sodium technology in the field of material research and the effect of sodium on material properties were reviewed based on author's experience and knowledge. Author hopes that the report is reflected to the future R&D and the technical succession for engineers.

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