Thermal decomposition of siliceous concrete under elevating temperature

Kikuchi, Shin  ; Koga, Nobuyoshi*; Seino, Hiroshi 

In a postulated severe accidental condition of sodium-cooled fast reactor (SFR) such as core melt through, molten core materials containing liquid metals and fuels heated to very high temperatures may attack the structural concretes. This would cause Molten Core-Concrete Interaction (MCCI). MCCI gives extreme thermal loading to the structural concretes and results in their erosion and decomposition. In this study, for elucidating the thermal behavior of the siliceous concretes of SFR at high temperatures, Thermogravimetry-Differential Thermal Analysis (TG-DTA) measurements were carried out for the tight sandstone concrete. It was revealed that offset of melting of the siliceous concretes was appoximately 1300-1400 C.