Nuclear power plant digital instrumentation and control modifications

An instrumentation and control systems upgrade is planned for Three Mile Island Unit 1, an 871 MW Babcock and Wilcox pressurized water reactor. Installation will be completed in phases extending over four or more operating cycles. It will encompass most nonnuclear instrumentation and control functions, including makeup/letdown, condensate demineralizer, feedwater demand, and reactor demand. The system platform chosen is a state-of-the-art, fault-tolerant architecture which has been extensively evaluated by the B&W Owners Group. The platform will also provide operator interface for other vendor supplied digital control systems such as turbine control.<>