Conceptual design study of JSFR (4) - Reactor building layout

Japan Atomic Energy Agency (JAEA) and Mitsubishi FBR Systems, Inc. have promoted the conceptional design of the Japan Sodium-Cooled Fast Reactor (JSFR) in the Fast Reactor Cycle Technology Development (FaCT) project. This paper describes the concept of the reactor building layout on the JSFR. Reduction of construction costs is one for the most important matters for commercialization of fast reactor. Miniaturization of reactor building and investigation of construction method for reduce construction term has been carried out in this layout design. In miniaturization of the reactor building, sharing of facilities (such as Fuel-handling facilities, waste-disposal facilities) and rationalization of components arrangement according to be a rectangular containment vessel has been carried out. Especially for containment vessel, steel plate concrete structure (SC structure) is planned to adopt. It is expected that conventional works such as steel rod reinforced work and installation / withdrawal of a mold work become unnecessary.For adoption of SCCV (Steel plate Concrete Containment Vessel), research and development are furthered. As the result, the size of the reactor building is about 104m(L) x 77m(W) x 70m(H). On the other hand, innovated construction method called 'Large Unit Construction Method' has been investigated to reduce construction term. The construction method is assembled skeleton building structure unit in factory and transported to the site by ship. The unit division proposal in Large Unit Construction Method is set up and the weight for every unit is computed. Becoming division of a total of 13 units, maximum weight of the unit is 6,000ton. Examination which shortens the construction time is performed and the trial calculation of the construction time is made with the second half for 30 months for one plant. And also, the highly increased earthquake loading is required because of the Niigataken Chuetsu-oki Earthquake in 2007, the seismic isolation system is adopted to the reactor building