Development of Heat Exchanger Thermal Performance Monitoring Program

Through researches for the last three years, as a part of KNICS R and D program, we were able to identify current status and problems of thermal performance test, analysis, and diagnosis being performed in nuclear power plants, Korea. In the old nuclear power plants, performance analysis procedures of not only turbine cycle but safety-related heat exchanger in the primary system were being required. In particular, in the case of the Gori units 3,4 where periodic safety assessment(PSR) was performed recently, safety-related heat exchanger management program was required as follow-up measures of PSR. Performance analysis of safety-related heat exchangers is used to evaluate reliability of heat exchangers during long-term operation. The significance of this analysis lies in the fact that it can evaluate safety and viability at the same time. However, there exists discrepancy between conditions of normal operation and design, which makes it difficult to develop performance analysis procedure. This study focused on development of performance analysis procedure of safety-related heat exchangers in primary system