Recent computer modeling achievements in PAUT applications for WWER type NPPs

摘要

This paper is devoted to review predominantly phased array ultrasonic testing (PAUT) results and their comparison with computer modeling PAUT simulation by CIVA s/w for selected WWER type piping systems. As examples were used phased array ultrasonic experiments performed on three WWER type nuclear power plant specific test assemblies: pressure measurement piping nozzle to WWER 1000 primary circuit Dn 850 piping weld, welding procedure qualification test block of WWER 440 type steam generator collector dissimilar metal weld and WWER 1000 secondary circuit 273×16 mm piping weld test assembly. Experience and lessons learnt from CIVA modeling of PAUT examinations compared with PAUT inspections performed on the same test assemblies with intended defects are summarized. Promising WWER 440 and WWER 1000 type examples of compliance of PAUT examination and PAUT simulation results are provided for defects in the 1:1 full scale weld test assemblies.