CHECWORKS와 ToSPACE 프로그램의 배관감육 해석결과 비교

Abstract

Assumptions have always been that wall thinning on the secondary side piping in nuclear power plantsis mostly caused by Flow-Accelerated Corrosion (FAC). Recent studies have showed that wall thinningon the secondary side piping is caused by Liquid Droplet Impingement Erosion (LDIE), Solid ParticleErosion (SPE), cavitation, and flashing. To manage those aging mechanisms, several software suchas CHECWORKS, COMSY, and BRT-CICERO have been used in nuclear power plants. Korean nuclearpower plants have been using the CHECWORKS program since 1996 to date. However, many siteengineers have experienced a lot of inconveniences and problems in using the CHECWORKS program. In order to work through the inconveniences and to remedy problems, KEPCO-E&C has developeda “3D-based pipe wall thinning management program (ToSPACE)” based on the experience of over30 years in relation to the pipe wall thinning management. This study compares the results of FACand LDIE analysis using both the CHECWORKS and ToSPACE programs with respect to validationof the wall thinning analysis results.