Abstract
Internal stresses in specimens cut from the natural WWER-1000 reactor vessel have been investigated using neutron diffraction. Thin and thick templates (flat specimens cut from a bulk product) have been studied and the effect of the volume factor on the stress distribution has been revealed. A good agreement between the experimental data and previous theoretical calculations has been established. The tangential stresses in the ferrite at the ferrite-austenitic coating interface are compression stresses, which allows us to assume that the product has a high resistance to corrosion cracking.
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