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D. Kozlov , V. Golovanov , V. Raetsky, G. Shevlyakov, V. Lichadeev , M. Tikhonchev

Investigation of 15kh2NMFAA steel and weld after irradiation in the “Korpus” facility on the RBT-6 reactor. D. Kozlov , V. Golovanov , V. Raetsky, G. Shevlyakov, V. Lichadeev , M. Tikhonchev. Object :

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D. Kozlov , V. Golovanov , V. Raetsky, G. Shevlyakov, V. Lichadeev , M. Tikhonchev

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  1. Investigation of 15kh2NMFAA steel and weld after irradiation in the “Korpus” facility on the RBT-6 reactor D. Kozlov, V. Golovanov, V. Raetsky, G. Shevlyakov,V. Lichadeev, M.Tikhonchev

  2. Object: • Determination of radiation embrittlement for weld and base metal through the wall thickness of WWER-1000; • Evaluation of radiation condition influence on the damage and mechanical properties of vessel steel

  3. Materials:Weld, Base metal, Heat Affected Zone,Vessel ofWWER-1000/320, the shells after complete treatment. Experimental shell 15kh2NMFAA steel (class 0) with low nickel content (0,75%Ni) Irradiation condition: The specimens irradiation was carry out in the “Korpus” facility on the RBT-6 reactor. Fluence - up to 11×1019cm-2 Irradiation temperature - 290±15 0C

  4. Core Level I Specimens II III 11 12 13 14 15 16 IV 21 22 23 24 25 26 V Core Central Plane VI 31 32 33 34 35 36 22 23 24 25 26 Location of capsule in the facility and specimens in the capsule 100-130 Charpy specimens on the third and fourth level Thickness of the specimens block 60 or 70 mm

  5. 200 150 100 50 0 -160 -120 Analysis results after irradiation of capsule with rotation changesTF Energy ( J) deviation -80 -40 0 40 80 120 160 200 240 Temperature (0C)

  6. Deviations of Charpy tests results from fitting curve. Dependence from irradiation place. а) For Base metal and HAZ b) For weld Deviation ( J) а) Distance from capsule center, mm Deviation ( J) b) Distance from capsule center, mm

  7. Deviations of Charpy tests results from fitting curve. Dependence from irradiation temperature. а) For Base metal and HAZ b) For weld Deviation ( J) а) Irr. Temperature (0C) Deviation ( J) b) Irr. Temperature (0C)

  8. Base metal Fluence Dependence TF fromneutron fluencefor 15kh2NMFAA steel after irradiation of “thick” assemblies : class 0 (○);class 1(■); class 1(×); TF= Af (F/F0)1/3withAf=9 оС( );

  9. AF=20 ΔTF, 0C AF=16.5 AF=11.5 Fluence ×1019 см-2 (Е>0.5 МeV) Weld metal DependenceTF from neutron fluencefor weld metalafter irradiation of “thick” assemblies

  10. Figure 3 – Role of Mn in embrittlement of high Ni welds (VVER-1000 surveillance data)

  11. Radiation energy release (а) and flux of thermal neutrons (b) through the specimens block thickness under irradiation with rotation Irr. Heating(W/g) Distance from capsule center, mm Thermal neutron flux(1/cm2 c) Distance from capsule center, mm

  12. Conclusions 1. Irradiation of the WWER-1000 vessel materials was carried out using the capabilities of the KORPUS facility. Irradiation of the reactor wall was simulated in the experiment including changes of neutron flux and spectrum. 2. TFfor base metal does not exceed 30-40 0С, for weld metal - 70-80 0С at fluence corresponding to 50-60 years of the WWER-1000 operation. 3. The dependences of radiation embrittlement obtained under the radiation flux attenuation do not correspond to the normative dependence, where TFdepends on neutron fluence with energy more than 0,5 MeV. For base metal there is difference from the surveillance data. The change of the radiation flux characteristics effects the embrittlement degree. 4. One of the possible causes of the embrittlement degree change under irradiation of the “thick” assemblies is the change of thermal neutron flux. However, the determination of the quantitative contribution of each type of ionizing radiation requires additional experiments.

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