NuScale is a reactor design based on a concept originally proposed by Oregon State University in the USA. A NuScale plant can consists of one to 12 independent modules, each capable of producing a net electric power of 45 MWe. Each module includes a Pressurized Light Water Reactor oper­ated under natural circulation primary flow conditions. Each reactor is housed within its own high-pressure containment vessel which is submerged underwater in a stainless steel-lined concrete pool. In early 2008, NuScale Power notified the US Nuclear Regulatory Commission of its intent to begin pre-application discussions aimed at submitting an application for design certification of a 12-module NuScale power plant.