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The AGC-1 Creep Experiment - Results and Analysis

The AGC-1 Creep Experiment - Results and Analysis. Tim Burchell Fusion Materials & Nuclear Structures Group Materials Science & Tech. Division and Will Windes Idaho National Laboratory. INGSM-15 HANGZHOU, CHINA Sept 15-18, 2015. Acknowledgements. This work is sponsored by the

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The AGC-1 Creep Experiment - Results and Analysis

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  1. The AGC-1 Creep Experiment - Results and Analysis Tim Burchell Fusion Materials & Nuclear Structures Group Materials Science & Tech. Division and Will Windes Idaho National Laboratory INGSM-15 HANGZHOU, CHINA Sept 15-18, 2015

  2. Acknowledgements This work is sponsored by the U.S. Department of Energy, Office of Nuclear Energy Science and Technology under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed by UT-Battelle, LLC. The author wishes to acknowledge the contributions of Ashli Clark (ORNL)

  3. The AGC-1 Graphite Creep Experiment • Outline of Presentation • The AGC Graphite Creep Experiment • The AGC-1 Graphite Creep Capsule • AGC-1 Graphite Graphites & Specimens • Graphite Post Irradiation Examination (PIE) Testing • Creep Strain Analysis • (all data analyzed, no data rejected) • Comparison with H-451 and IG-110 ”historical” data for dimensions & volume change • Creep Coefficient, K • Other Grades in AGC-1: NBG17; NBG-18; PCEA; IG-430 • Dimensions • Creep Coefficient, K • Comparison of second stage creep coefficients, K, for the various grades examined with literature data • KE0 Comparison for all six grades in AGC-1 • Conclusions

  4. The AGC Graphite Creep Experiment The AGC Creep experiment comprises six ATR irradiation capsules that shall provide data over the reactor design envelope AGC-1 was the first of these capsules (prototype) and shall provide design data (at Tirr ~ 600°C) on: Effect of neutron Irradiation on the dimensions and key physical properties of graphite Graphite creep strain and creep rate data Effect of neutron Irradiation induced creep strain on key physical properties of graphite

  5. The AGC-1 Graphite Creep Capsule Experimental Variables (Creep/Control Specimen) Specimen Orientation: WG/AG Graphite Grades: NBG-18, NBG-17, H-451, PCEA, IG-110, IG-430 Irradiation Dose Range: 2.8 – 6.9 DPA Measured with flux wires Irradiation Temperature Range: Approximately 472-710 °C Measured with TC’s and SiC temperature monitors Applied Stress (nominal): 2 channels @ 2 ksi (13.8 MPa) 2 channels @ 2.5 ksi (17.3 MPa) 2 channels @ 3 ksi (20.7 MPa)

  6. The AGC Graphite Creep Experiment The major Grades in the AGC series* Specimen quantities: NBG-17 = 34; NBG-18 = 34; H-451 (Reference Grade) = 20; PCEA = 34; IG-110 (Reference Grade) = 20; IG-430 =32. Total = 174 SPECIMENS *GRADE 2114 (MERCEN) ADDED IN AGC-2 ONWARDS

  7. The AGC-1 Graphite Creep Experiment

  8. The AGC-1 Graphite Creep Experiment

  9. The AGC-1 Graphite Creep Experiment Steady State or “Linear” Creep Transient Creep

  10. The AGC-1 Graphite Creep Experiment Creep and Control Specimen Volume Change Similar (especially at lower doses). All six graphites observed to have similar creep and control volume change curves! CREEP AT CONSTANT VOLUME

  11. The AGC-1 Graphite Creep Experiment H-451 dimensional change,% Specimen Length (WG) Specimen Diameter (AG)

  12. The AGC-1 Graphite Creep Experiment Longitudinal (WG) creep strain plots for grade H-451 Normalized creep strain (WG) Coefficient, K = -0.0203 %/DPA·MPa or 0.138 x 10-30 cm2/n·Pa

  13. The AGC-1 Graphite Creep Experiment

  14. The AGC-1 Graphite Creep Experiment

  15. The AGC-1 Graphite Creep Experiment Creep coefficients summary

  16. The AGC-1 Graphite Creep Experiment

  17. The AGC-1 Graphite Creep Experiment H-451 total creep strain in microns Creep strain ratio = Ɛ(lat)/Ɛ(long) = (18.11/-102.18) = -0.18

  18. The AGC-1 Graphite Creep Experiment Mean ± 1Standard Deviation H-451 Poisson's Ratio (unirradiated), ν = -0.31 ± 0.01 H-451 Poisson's Ratio (irradiated unstressed or control specimen), νirr = -0.29 ± 0.03 H-451 Poisson's Ratio (irradiated stressed or crept specimens), νirr = -0.28 ± 0.04 H-451 Creep strain ratio ƐC(lat)/ƐC(long) = -0.18

  19. The AGC-1 Graphite Creep Experiment A Comparison of Poisson's Ratio (irradiated and Unirradiated and The Creep Strain Ratio for the Six Graphites in AGC-1

  20. The AGC-1 Graphite Creep Experiment NBG-17 and IG-430 ARE SUSPECT!

  21. The AGC-1 Graphite Creep Experiment CONCLUSIONS • The AGC-1 creep capsule has completed its irradiation, it has been dismantled, the specimens & Tmonitors shipped to ORNL. PIE (except strength testing) has been completed. • Grades NBG-17, NBG-18, H-451, PCEA, IG-110 and IG-430 were examined • Initial analysis of dimensional change and creep strain data for all graphites completed • Thermal design/control/operation of AGC-1 was not optimal and made the analysis more challenging • The dimensional behavior of H-451 and IG-110 compare favorably with previous data • The volume change behavior of the creep and control samples were seen to be similar, especially at lower doses, for all six grades • The creep strain data are linear and lend themselves to analysis using the simple “linear” creep law.

  22. The AGC-1 Graphite Creep Experiment CONCLUSIONS(continued) • Creep strain was normalized to applied stress and plotted against dose, creep strain data falls on common line • The use of the linear creep model is justified at the low doses encountered in AGC-1 • K for all graphites compares favorably with literature data • Comparing K.E0 for all six graphites (longitudinal and lateral) revealed NBG-17 and IG-430 data to be suspect Next Steps: Eliminate dimensional/creep data from AGC-1 analysis where Tirr >500°C but <700°C, and the temperature difference between creep and control specimen pairs is > 100°C

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