iter structural design criteria for in-vessel components (sdc-ic)

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ITER G 74 MA 8 01-05-28 W0.2 Start Conduct Elastic- Irradiation Creep Analysis (B 3024.1.1) no Select Damage Mode Select Criteria Level Check if finite deformation analysis necessary (B 3021) Is swelling negligible? (B 3022) yes Is Irradiation-Creep negligible? (B 3101) Conduct Elastic Stress Analysis (B 3023) Elastic Analysis Limits satisfied? Criteria Satisfied Stop yes yes no no Include swelling stress in analysis (B 3024.1.1.1) optional Is Irradiation-Creep negligible? (B 3101) Conduct Elasto- Plastic Analysis (B 3024.2) Elasto-Plastic Analysis Limits Satisfied? no Criteria not satisfied Redesign Conduct Elasto- Visco-Plastic Analysis (B 3024.5) Figure BÊ3030-1 Analysis flow chart for satisfying the limits of a given Criteria Level and damage mode at low temperatures B 3040 Rules for the prevention of excessive deformation affecting functional adequacy yes BÊ3050 Negligible thermal creep test For a component or a part of a component, thermal creep is negligible over the total operating period if the condition of the test performed using the following procedure is satisfied. SDC-IC, Appendix B. Guidelines for Analysis page 36 yes no
ITER G 74 MA 8 01-05-28 W0.2 1) The total operating period of the component, throughout the life of the component is taken into account. 2) The total operating period is divided into N time intervals. For each interval i, of a duration ti, the maximum temperature reached is denoted Ti, 3) To take full advantage of this rule, the intervals of time should be chosen in such a way that the temperature changes as little as possible throughout each interval. 4) The time tci required for the material at a temperature Ti and at a stress 1.5 Sm(Ti, 0) to accumulate a thermal creep strain of 0.05% is obtained from the curves in A.MAT.4.1 of Appendix A (Negligible thermal creep curve). 5) The effect of creep is negligible if the sum of the N ratios of duration ti to the maximum time tci is less than 1: N å 1 i = ( ti/ tc) £ 1 B 3100 LOW TEMPERATURE RULES i The low-temperature rules are applicable if the negligible thermal creep test B 3050 is satisfied. B 3101 Negligible irradiation-induced creep test At low temperatures where thermal creep is negligible (B 3050), significant time (or neutron fluence) dependent strain may still occur due to irradiation-induced creep. These strains may relax thermal stresses and alter the stress-strain distribution in the component. However, if the fluence at end-of-life is sufficiently low, the effects of irradiation-induced creep can be ignored in the analysis. For a component or a part of a component, irradiation-induced creep effects can be neglected over the total operating period if the condition of the test performed using the following procedure is met. 1) The total operating period of the component throughout its life and for all loadings including temperature and flux for which compliance with levels A and C criteria is required, are taken into account. 2) The total operating period is divided into N time intervals. For each interval i, of a duration ti, the maximum thickness-averaged temperature reached Tmi, the mean neutron flux Fmi, the mean neutron fluence Ftmi and the corresponding value of 1.5Smi(Tmi, Ftmi) are noted. 3) To take full advantage of this rule, the time intervals must be chosen in such a way that the temperature and the neutron flux change as little as possible throughout the interval. 4) For each interval i, determine the neutron fluence Ftc2i necessary to accumulate an effective in-reactor creep strain of 0.05% at an effective stress of 1.5Smi(Tmi, SDC-IC, Appendix B. Guidelines for Analysis page 37
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iter structural design criteria for in-vessel components (sdc-ic)

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