Nuclear Energy
Home  4S
Print This Page
4S - Super-Safe, Small and Simple

There is a growing demand in remote and isolated areas around the world for cost-efficient energy sources that do not emit greenhouse gases. From this perspective, smaller-sized nuclear power plants have attracted worldwide attention. In the United States, pre-application discussion of licensing has begun with the Nuclear Regulatory Commission (NRC).



4S is designed to be equipped with "Passive Safety" functions. This means that 4S systems would safely shut down operation, and the physical cooling process would occur without human intervention.


Net output of electricity is expected to be 10MWe or 50MWe.


No onsite refueling for 30 years1. Maintenance requirements are minimized by utilizing an electromagnetic pump with no moving parts.

1in case of 30MWt