QUANTITATIVE-EVALUATION ON DESIGN SIMPLIFICATION OF THE CHEMICAL AND VOLUME CONTROL-SYSTEM

Recently, most of the countries using nuclear power for electricity ge neration are working towards the safer and the more economical designs . In practice some typical nuclear steam supply system (NSSS) vendors are developing evolutionary reactors or passive type reactors based on current technologies. One of the most important features of these adv anced reactors is system simplicity. In this study, a model has been p resented to quantitatively evaluate system simplification. Design enha ncements in simplicity of the chemical and volume control system (CVCS ) of the ABB-CE System 80+ and the Korean standardized nuclear power p lant (KSNPP) have been evaluated using the presented model. The quanti fication model is based on the informational entropy concept and syste m availability analysis. The quantification results indicate that the simplicity of the CVCS is highly dependent on the type and the number of charging pumps. Also, it is found that higher redundancy does not a lways result in higher availability. Finally, it is stated that the in formational entropy concept and the system availability analysis can b e a valuable tool for the quantitative evaluation of system simplifica tion.