Experience in Renovation of the Control and Instrumentation System of the Dalat Nuclear Research Reactor

Abstract

The Control and Instrumentation System (CIS) of the Dalat Nuclear Research Reactor(DNRR) was designed and manufactured by the former Soviet Union and put into operation in November 1983. In general, the system has had good reliability and proved its ability to ensure reactor safety operation. However, spare part procurement problems were expected and, due to using technology of the 1970s with discrete and low-level integrated electronic components, the system technology became obsolete and unsuited to a tropical climate. After ten years of reactor operation, the CIS's reliability was degraded because of aging of equipment and electronic components. Those were the main reasons for the system renovation and modernization.