Пошуки оптимального підходу для визначення зсуву критичної температури крихкості матеріалів корпусів реакторів типу ВВЕР-1000

Abstract

This paper presents a comparison of the transition temperature shifts due to irradiation based on the fracture toughness (∆T0) and Charpy impact test data (∆TF) for VVER-1000 RPV weld metal. The ductile to brittle transition temperature shift ∆TF was determined by three different methods: (1) according to recommendations of PNAE G-7-002-86, (2) using the fixed index impact toughness level of 35 J/cm2 and (3) using the index impact toughness level which depends on Charpy upper shelf energy. The analysis has shown that in all cases the Charpy impact test data underestimate the shift of a fracture toughness curve. The adjustment of 10°C for the ∆T F shift is proposed to be consistent with the ∆T0 value