Electromagnetic pumps for main cooling systems of commercialized sodium-cooled fast reactor

Aizawa, Kosuke ; Chikazawa, Yoshitaka  ; Kotake, Shoji; Ara, Kuniaki ; Aizawa, Rie*; Ota, Hiroyuki*

This study investigates the adequateness of a modular-type EMP system for large-sized (1500 MWe class) sodium-cooled fast reactors. There is concern that such a large EMP will cause flow instability. A modular-type EMP system can solve this issue since smaller EMPs are arranged in parallel and the flow rate of each EMP is reduced. Parallel-module-EMP systems have been investigated as the primary and secondary circulating pumps. The results of the design study and electro-magnetic analysis on the primary main pump confirmed that flow instability does not occur under all operational conditions. The modular-type EMP system is also effective for the secondary system, drastically simplifying the piping arrangement. The results of this study show that the modular-type EMP system is highly compatible with the main circulating pumps of large-sized sodium-cooled fast reactors as well as the advantages gained from adopting this system.