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The toughness of a through-wall trepan sample cutout from the shut-down Novovoronesh Unit-1 was characterized with reconstituted specimens. The trepan sample was taken from the core weld and also contained base metal from the upper and lower forged rings. Because the sample is relatively small, with a diameter of 110 mm and a height of 120 mm, effective use of the material is of vital importance. Standard Charpy specimen size was chosen to be used throughout the sample. All the specimens were reconstituted from 10 by 10 by 16-mm unit volumes. Both Charpy-V impact and Charpy-size three-point bending (3-PB) specimens were used. The validation of specimen preparation technique includes Charpy-V impact and static 3-PB tests with reference and irradiated materials and is described in detail. The results for one base metal, including the vessel wall condition and annealed conditions at 470°C/168 h and 650°C/2 h, are reported and discussed.
pressure vessel steel, irradiation embrittlement, annealing, specimen reconstitution, vessel wall sampling
Senior research scientist, VTT (Technical Research Center of Finland), Reactor Laboratory, Espoo,
Manager, Imatran Voima Oy, Vantaa,