S-PRISM, also called PRISM (Power Reactor Innovative Small Module), is the name of a nuclear power plant design by GE Hitachi Nuclear Energy (GEH) based on a sodium-cooled fast breeder reactor[1]. The design utilizes reactor modules, each having a power output of 311 MWe, to enable factory fabrication at low cost. The design is based on the Integral Fast Reactor. The Integral Fast Reactor was developed at the West Campus of the Argonne National Laboratory in Idaho Falls, Idaho and was the intended successor to the Experimental Breeder Reactor II. The Integral Fast Reactor project was shut down by the U.S. Congress in 1994. The S-PRISM represents GEH's Generation IV reactor solution to closing the nuclear fuel cycle and is also part of its Advanced Recycling Center proposition[2] to U.S. Congress to deal with nuclear waste.
In October 2010, GEH signed a memorandum of understanding with the operators of the Department of Energy's Savannah River site, which should allow the construction of a demonstration reactor prior to the design receiving full NRC licensing approval[3]. In October 2011, The Independent reported that the UK Nuclear Decommissioning Authority (NDA) and senior advisers within the Department for Energy and Climate Change (DECC) had asked for technical and financial details of the PRISM, partly as a means of reducing the country's plutonium stockpile.[4]