Study on heat transfer characteristics of reactor cavity cooling system using radiation

Nishimori, Yuya*; Akashi, Tomoyasu*; Uwada, Shogo*; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*; Takamatsu, Kuniyoshi  

A new RCCS with passive safety features consists of two continuous closed regions. One is a region surrounding RPV. The other is a cooling region with heat transferred to the ambient air. The new RCCS needs no electrical or mechanical driving devices. We started experiment research with using a scaled-down test section for understanding effect of expansion of heat transfer areas of the cooling region on cooling performance and heat transfer characteristics. For example, two experiments with and without insulation covering a part of the heat transfer area of the cooling region were performed. As a result, in the case of the experiment without the insulation, the heater power could be increased; therefore, it is effective for an actual RCCS to increase heat transfer areas.