A Computerized Axial Power Distribution Monitoring System for Pressurized Water Reactors

Minicomputer implementation has proven successful in developing the Axial Power Distribution Monitoring System (APDMS) which is used to monitor the axial power shape within some pressurized water reactors. The APDMS and its main subsystems are described. A control subsystem interfaces the APDMS to existing plant equipment. A dedicated minicomputer is introduced into the system to enhance its capabilities. The features of the minicomputer subsystem are described. The computer is also capable of performing continuous on-line testing and self-checking. Techniques for improving system availability and security are presented. Current operating experience has demonstrated that the APDMS serves a useful function in plant operation. In addition, the computer subsystem has demonstrated its reliability and practicality in the plant environment.