Failed fuel detection from standpoint of a manufacturing company

Needs for the installation of the FFD system depends on the reactor type, circumstances of fuel failure during operation and whether the reactor is commercial, prototype or experimental. And the needs also depends on whether the refueling is carried out on-power or off-power. For on power refueling FFDL gives important information to remove the just failed fuel at the earliest stage. Development and application of technology of failure diagnosis on reactor plants are also attractive for FFD and fuel failure prevention. Our company has some experiences on R and D for the FFD system of JOYO(FBR) and incipient failure diagnosis such as acoustic method, noise analysis method concerning coolant temperature fluctuation, reactivity balance method etc.. (auth.)