Within the recently finished project CARISMA “Determination of Fracture Mechanics Values on Irradiated Specimens of German PWR Plants” a data base was created for pre-irradiated original RPV steels of the four construction lines of German PWRs, which allowed to examine the consequences if the Master Curve (T0) approach instead of the RTNDT concept is applied for the RPV safety assessment. In the new research project CARINA the experimental data base for both the safety concepts RTNDT and Master Curve for the proof against RPV brittle fracture will be extended by additional representative materials irradiated under different conditions and with respect to the accumulated neutron fluences and specific impact parameters (neutron flux, chemical composition, manufacturing effects). The investigation of materials irradiated to higher neutron fluences and different irradiation conditions complements the representativeness of the conclusions for the applicability of safety concepts to RPVs with longer operation times and beyond EoL respectively in terms of “Upper Bound” coverage. The obtained results will be evaluated on the basis of the already elaborated approaches and will be represented by the aid of the Master Curve concept in an appropriate way. An overview on the objectives, the experimental program, and the current status of the project is given. Finally first test results are presented and evaluated.

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