Small Core Size
The NuScale SMR design significantly reduces the risk of a radiological release and offsite consequences. The postulated release of radioactive material from a nuclear power plant to the environment (the source term) depends on the amount of fission products and other radionuclides in the reactor core.
The NuScale reactor core is only 5% of the size of large, conventional reactor cores. The smaller inventory of radioactive material in the NuScale core ultimately yields a smaller source term. This reduces the Emergency Planning Zone (EPZ) size required to provide the same level of protection to the public and the environment as currently operating nuclear power plants.