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Stress mitigation design of tubesheets with consideration of thermal stress inducement mechanism

応力発生機構に基づく応力最小化管板設計

安藤 勝訓 ; 高正 英樹*; 川崎 信史 ; 笠原 直人

Ando, Masanori; Takasho, Hideki*; Kawasaki, Nobuchika; Kasahara, Naoto

実用化に向けて研究開発の進められている高速増殖炉(JSFR)の蒸気発生器(SG)では、安全性と経済性の観点から一体貫流型直管2重管SGの採用が検討されており、その管板部は高温(520$$^{circ}$$C),高蒸気圧力(19.2MPa)で使用される。このSG管板に負荷される主たる応力は、内圧による1次応力と熱過渡時の熱応力となる。本件では、SG管板形状と内圧による1次応力及び熱過渡による熱応力の発生機構の関係を明らかにし、この結果に基づき、1次応力の設計制限を満足し、かつ熱過渡時の最大発生応力が最小となる管板形状を提案した。

Adoption of double-wall-straight tube steam generators made of Mod.9Cr-1Mo steel is planned for next generation fast breeder reactors in Japan. One of the major concerns relevant to the SG is structural integrity of tubesheets. In the reactor transient operation, thermal stress is induced by the temperature distribution in tubesheet and the magnitude of it depends on configurations of tubesheet. Stress generation mechanism of tubesheets was revealed through Finite Element analysis. Semi-spherical tubesheet models were investigated for the first survey of the thermal stress mechanism. As calculated results, semi-spherical tubesheet model gave the extensive peak stress around the outermost hole. Based on the those stress generation mechanism, authors proposed a stress mitigated tubesheet. It is center flatted spherical tubesheet as improved configuration.

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