Retrofits to BWR safety and nonsafety systems using digital technology

The history of safety-related and non-safety-related control systems designed into GE boiling water reactor (BWR) nuclear power stations is reviewed. Design limitations and parts availability for these older designs indicate the need to provide system replacements. Two contemporary digital product lines developed and offered by GE-Nuclear Energy provide system replacements. NUMAC is the safety-related product line and the GE Fanuc product line is used for non-safety-related applications. The resolution of issues encountered in the implementation of digital products in BWR systems such as application, qualification, and operator interface is discussed. The application of GE Fanuc equipment to the non-safety-related recirculation flow control system of a BWR-3 type reactor is discussed in some detail