Experimental-Statistical Analysis of Radiation Embrittlement of VVÉR-440 Vessel Materials

An experimental-statistical approach, consisting in obtaining and then analyzing statistically an experimental database, is used as a basis for predicting radiation embrittlement of reactor vessel materials. A large experimental database on radiation embrittlement of materials irradiated in VVÉR-440 has now been accumulated. The purpose of the present paper is to analyze these data statistically, compare the data with currently employed standard relation, and obtain a correlation relation, which better describes these data, for weld-seam material and for the main metal of a vessel. A new, more reliable, standard relation is developed for these materials and recommended for use. 6 figures, 6 references.[PUBLICATION ABSTRACT]