Special weld of 15Kh2MFA (Cr-Mo-V) type steel was investigated in several laboratories within the IAEA Coordinated round robin exercise. Specimens were irradiated by several fluences and impact tests of standard Charpy size and 5×5 and 3×4 mm specimens were then tested to determine appropriate transition temperatures and their shifts.

When applied normally used criteria (impact energy, lateral expansion, ductile fracture appearance), shifts in standard specimens and subsize specimens correlate well but not in 1:1 ratio — shifts in subsize specimens were observed to be smaller than in standard ones — the smaller size of specimens, the smaller transition temperature shifts have been obtained.

The paper tries to find appropriate criteria for better correlation between shifts in different sizes of impact specimens that can be supported by proper analysis.

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