NuScale Power Inc. is commercializing a modular scalable 45 Megawatt Electric Light Water Reactor nuclear power plant. Each NuScale Small Modular Nuclear Reactor (SMR) module has its own combined containment vessel and reactor system, and its own designated turbine-generator set. NuScale nuclear power plants are scalable, allowing for a single facility to have just one or up to 12 units. In a multi-module plant, one unit can be taken out of service without affecting the operation of the others.

Small Modular Nuclear Reactor (SMR) - NuScale Nuclear Power PlantNuScale Small Modular Nuclear Reactor (SMR) power plants are compact. Each component is modular and is designed for fabrication off-site at numerous existing facilities in the USA and around the world. Construction is less complex, lead times shorter, and costs more predictable and controllable. The NuScale containment and reactor vessel measures approximately 65 feet in length and 14.5 feet in diameter. It and all other modular components are transportable by barge, truck or rail.

In a NuScale system, the reactor pressure vessel contains both the nuclear fuel, or reactor, and the steam generators. Water in the reactor circulates using a convection process known as natural circulation. This is also described as a passive safety system because no pumps or other mechanical devices are required to circulate the water.

The nuclear reactor and steam generator, also known as the Nuclear Steam Supply System (NSSS), is a self-contained assembly of reactor core and steam generator tube bundles within a single pressure vessel. Throughout the design, every effort was made to employ existing off-the-shelf technologies to minimize, and in many cases eliminate, the need for additional research and development. The primary coolant (water) is moved by natural circulation, eliminating the need for primary coolant pumps and external power. The NSSS and the passive safety heat removal systems are housed within the compact steel containment.