The Fast Breeder ReactoriFBRj Development Program in Japan is a government sponsored project promoted by the Japan Atomic Energy Agency(JAEA), which incorporates government and private sector R&D talent to advance this important technology.
FBR development planning is based on on-going R&D utilizing full-scale mock-up test facilities during the construction and operation of an experimental fast reactor, followed by a step-up to a prototype reactor.
Investigation for FBR commercialization is to be based on the experience that these reactors provide.
Accordingly, the experimental fast reactor Joyo took its place as an important step in the first stage of the FBR development program

The three major objectives of Joyo operation are:
(1) Advancement of technology through operation and experiment.
(2) Irradiation testing on fuel and materials.
(3) Validation of innovative technology for the development of future FBRs.

The three major objectives of Joyo operation symbolize the role of Joyo in the first phase project
In pursuit of these major objectivesCa variety of R•D programs have been conducted during Joyo operation.
The results of these programs have been applied to MONJU, the reactor built in Tsuruga CityCFukui Prefecture and FBR commercialization.