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Report No.
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Steam generator with straight double-walled tube; Development of fabrication technologies of main structures made of high chrome steel-made

Kurome, Kazuya*; Kawamura, Masaya*; Enuma, Yasuhiro*; Tsujita, Yoshihiro*; Sato, Mitsuru*; Futagami, Satoshi  ; Hayafune, Hiroki

Steam generator (SG) with straight double-walled tube is adopted for the Japan Sodium cooled Fast Reactor (JSFR). This paper describes the research and development of the SG with straight double-walled tube. To improve reliability of the SG against sodium-water reaction, the Double-walled tube is adopted. Double-walled tubes consist of inner and outer tubes, and they are mechanically contacted each other. It is important to keep high reliability without incurring a performance penalty. Therefore we put a cap on the amount of clearance less than a few micro meters, and design to keep contact in operating conditions. In this report, manufacturing technologies of the Double-walled tube and fabrication technologies such as welder for narrow space are reported.

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