Bonding of Impermeable SiC Ceramic Nuclear Reactor Components

The high temperature operation of Generation IV nuclear systems will require silicon carbide ceramic composites in the reactor core to minimize operational costs and enhance safety. Currently, no ceramic composite fabrication method has been successfully demonstrated that enables rapid, affordable bonding of impermeable SiC subcomponents to each other. The bonding technology will be a critical component in the manufacture of SiC reactor components. Physical Sciences Inc. will develop methods of forming robust joints between both silicon carbide (SiC) ceramic matrix composite (CMC) nuclear components and monolithic SiC components. The laser based production methods will be suitable for not only advanced reactor technologies but also cladding and other component manufacture for current generation plants. The bonded joints must survive the nuclear environment over the predicted lifetime. The work in the proposed program will include iterative development and test of joints and joint designs in configurations and environments relevant to both VHTR and current LWR reactor designs. These include thermo-mechanical testing, permeability testing, and high pressure hot water/steam exposure. Commercial Applications and Other Benefits: Silicon carbide composite reactor components will enable safer, more efficient operation of present and future nuclear systems. The radiation tolerant nature of silicon carbide composites will reduce the likelihood of component failures due to embrittlement from radiation exposure. The materials will enable maintenance cycles of next generation nuclear plants to be determined by fueled components and will reduce the waste produced by nuclear systems.