Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactor, 2; Effect of BC addition on thermophysical properties of austenitic stainless steel in a solid state

ナトリウム冷却型高速炉の炉心崩壊事故時の制御棒共晶溶融挙動に関する研究,2; 固相におけるオーステナイトステンレス鋼の熱物理特性に与えるBC添加量の影響

高井 俊秀  ; 古川 智弘  ; 山野 秀将   

Takai, Toshihide; Furukawa, Tomohiro; Yamano, Hidemasa

In a core disruptive accident scenario, boron carbide (BC) in control-rod will be predicted to react with stainless steel (SS) as structural material. Produced eutectic material of SS-BC is assumed to relocate widely in the core. To add a function of evaluating this liquefaction and relocation behavior to CDA analysis codes, it is indispensable to maintain the thermophysical properties database of SS-BC. In this report, density and specific heat of SS-7mass%BC in a solid state were obtained, and compared them with those of SS-5mass%BC obtained so far and literature value of SS. It is found that the density decreased while the specific heat increased, as BC concentration in the austenitic stainless steel increased. By addition of 7mass%-BC to 316L SS, the density was decreased by approximately 7% at 294K. On the other hand, specific heat was increased by approximately 21% at 294K.