MMR™ Energy System
The Micro Modular Reactor (MMR™) system is a 4th Generation nuclear energy system that delivers safe, clean, and cost-effective electricity and heat to remote mines, industry, and communities. It is the leading SMR project in Canada and the first so called "fission battery" concept worldwide.
The buried reactor core consists of hexagonal graphite blocks containing stacks of Ultra Safe’s FCM™ fuel pellets. The MMR™ reactor core has a low power density and a high heat capacity resulting in very slow and predictable temperature changes.
Helium gas is the MMR™ reactor’s primary coolant. The helium passes through the nuclear core and is heated by the controlled nuclear fission process. The helium then transports the heat away from the core to the Molten Salt System.
The MMR™ reactor uses helium as it is an inert gas; a radiologically transparent, single-phase gas with no flashing or boiling possible. Helium does not react chemically with the fuel or reactor core components. It is easy to accurately measure and control the helium pressure in the reactor.
