Large intermediate heat exchangers for tank type FBRs

The intermediate heat exchangers for FBRs are the large heat exchangers which carry out the heat exchange between the primary sodium extracting heat generated in reactor cores and the secondary sodium transmitting this heat to steam generators. This intermediate heat exchanger is hung from a roof slab covering a reactor vessel together with a primary main circulating pump in the case of a tank type FBR. In order to heighten the economical efficiency of a tank type FBR, it is effective to make the reactor structures such as a reactor vessel, for which high reliability is required, compact. To use four intermediate heat exchangers, to increase the unit capacity and to make the heat exchangers compact are most effective to decrease the size of a reactor vessel. In order to develop the intermediate heat exchangers of large capacity and compact size, the uniformity of flow in the heat exchangers, the hydrodynamic vibration of heat transfer tubes and other thermo-hydrodynamic design problems, and structural soundness problems have been researched. Toshiba Corp. carried out the research on the method of manufacturing the intermediate heat exchangers for tank type FBRs from 1984 to 1986. It is reported in this paper. (Kako, I.)