Software Design for Loft on-Line Computer Systems

The LOFT (Loss-of-Fluid Test) reactor facility is supported with a multiprocessor computer system for data acquisition, on-line data presentation, and other real-time functions. This paper describes the software design of the on-line functions of the LOFT computer system. An expansion of the system to support the LOFT Augmented Operator Capability Program has been implemented with the incorporation of an Operational Diagnostics and Display System (ODDS) to enhance reactor operator capability for decision making. The integration of the ODDS into the system is discussed with special attention to the software, and data flow through the entire system is traced. Recent developments toward advanced control room applications are addressed.