The reactor manual control system (RMCS) and the rod position information system (RPIS) applied to boiling water reactor power plants are among the most important systems in controlling the output of nuclear reactor power. A highly reliable RMCS and RPIS employing microprocessors is presented. The developed equipment has been made fault tolerant by adopting the redundancy of each system. The amount of cabling normally required has been reduced by multiplexing transmission via fiber-optic cable. The size of the control panel has been reduced and maintainability improved. The system hardware and software have been standardized into units and modules, which provides the equipment with sufficient flexibility to cope with plants with a varying number of control rods. This system can be applied to the replacement of conventional systems in operating plants as well as initial installation in new plants.
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