Analysis of strain distribution of lead-bismuth eutectic inside a stainless steel cup by wavelength-resolved neutron imaging

大平 直也*; 樹神 克明   ; 伊藤 大介*; 齊藤 泰司*; Parker, J. D.*; 篠原 武尚   

Odaira, Naoya*; Kodama, Katsuaki; Ito, Daisuke*; Saito, Yasushi*; Parker, J. D.*; Shinohara, Takenao

Lead-bismuth eutectic has emerged as a promising candidate for liquid metal coolant for Gen-IV nuclear reactors. Lead-bismuth eutectic is a unique material that expands gradually within the solid state. It may induce pipe deformation or rupture if it solidifies in a pipe or a container. In this study, the strain distributions of lead-bismuth eutectic in stainless-steel cups were evaluated using wavelength-resolved neutron imaging method. The wettability-improved case exhibited significantly larger compressive strain than in the others. The adhesion between lead-bismuth eutectic and the inner surface of the cup was a critical issue in the present study.