Erosion-corrosion prediction and inspection program for Krsko NPP

Pipe wall thinning through erosion-corrosion (E/C) is a problem receiving much attention in the nuclear and non-nuclear industry, and is also involved in the Krsko nuclear power plant. In 1991, the Krsko plant decided to upgrade its inspection programme and acquired computerized systems for thickness data acquisition, management and evaluation. The Krsko plant and Westinghouse performed a systematic E/C prediction analysis for all carbon-steel high-energy piping, using the state-of-the-art computer model using the EPRI (Electric Power Research Institute) code CHECKMATE. The E/C predictions and the results of past inspections were combined to redefine a new inspection plan starting with the spring 1992 outage. The first phase of the project is described including computer modelling and the inspection plan prepared for the upcoming outage. (Z.S.) 1 tab., 4 figs., 3 refs