Adopting Modem Computer System Technology to Nuclear Power Plant Operations

Abstract

Instrumentation, control and monitoring systems in operating nuclear power plants generally utilize analog technology. As these systems age and become obsolete, utility companies are beginning to incorporate digital technology due to its proven record of high reliability in other industries, as well as wide spread availability. One of the major choices facing utilities in the I&C upgrade process is the use of digital computer-based systems to replace the existing analog control systems. Digital computer-based control systems provide improved functional control capabilities and the potential for communications with other plant control and monitoring systems. In addition, new challenges are associated with digital technology that must be faced by the utility. These include items such as evaluating the effects of electromagnetic and radio frequency interference on the system reliability, the need for software verification and validation, the review of abnormal conditions and events analysis (ACEs), as well as overall licensing aspects and the need to increase use of commercial-grade equipment to decrease cost, particularly for safety systems. This paper will review these aspects of adopting digital control technology and improvements in plant monitoring and network communications to nuclear power plants.