Abstract
Welding of WWER-1000 reactor vessel of steel 15X2HMΦA is performed using the C B-12X2H2MAA wire and Φ⨿-16 or Φ⨿-16A flux. Nickel content in the weld metal usually lays within the limits 1.2–1.9%. The experimental data is shown on the weld metal with the nickel contents 1.28–2.45% after irradiation with fluence up to 260.10 22n/m 2 at energy more than 0.5 MEV. The embrittlement was measured by shift of critical brittleness temperature. Has appeared, that the weld metal with the low nickel content is the least responsive to irradiation embrittlement. The mechanical properties and fracture toughness of the weld metal with the contents of a nickel less than 1.3% are studied. Specimens CT-1T are tested, the “master-curve”, and its confidence bounds with probability of destruction 5 and 95% is built. “Master-curve” in the specified confidence interval is affirmed by CT-4T specimens test data. Is shown, that the mechanical properties and fracture toughness of the weld metal with the contents of nickel less than 1.3% satisfy the normative requirements.
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