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Benchmark Calculations in Support for FENDL-3 Generation

Benchmark Calculations in Support for FENDL-3 Generation. Mohamed Sawan Tim Bohm Fusion Technology Institute The University of Wisconsin-Madison. 2 nd RCM on FENDL-3 23-26 March 2010 IAEA, Vienna. Outline. Application of ENDF/B-VII.0 to FNG integral experiments

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Benchmark Calculations in Support for FENDL-3 Generation

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  1. Benchmark Calculations in Support for FENDL-3 Generation Mohamed Sawan Tim Bohm Fusion Technology Institute The University of Wisconsin-Madison 2nd RCM on FENDL-3 23-26 March 2010 IAEA, Vienna

  2. Outline • Application of ENDF/B-VII.0 to FNG integral experiments • Proposed material addition to FENDL-3 • Benchmark analysis for initial FENDL-3 startup library (release 2) • Problems with processed data • Benchmark analysis for corrected FENDL-3 startup library 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  3. Data Source for FENDL-2.1 Total 71 elements/isotopes 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  4. ENDF/B-VII.0 Applied to ITER Relevant FNG Experiments • Majority (40) of materials in FENDL-2.1 taken from ENDF/B-VI.8 • We investigated the effect of the recently released ENDF/B-VII.0 data (December 2006) on results for the FNG ITER relevant integral experiments • Examined tungsten, bulk shielding, streaming and HCPB breeder mock-ups • Compared calculated to experimental results (C/E) for 3 cases • FENDL-2.1 • All FENDL-2.1 data replaced by ENDF/B-VII.0 • FENDL-2.1 with data for the 40 materials only replaced by ENDF/B-VII.0 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  5. FNG Experiments Analyzed Tungsten Bulk shielding Streaming HCPB breeder 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  6. Tungsten experiment activation foils Average/Maximum of Calc/Exp 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  7. Bulk Shielding experiment activation foils Average/Maximum of Calc/Exp 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  8. Streaming experiment activation foils Average/Maximum of Calc/Exp 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  9. HCPB Breeder activation foils Average/Maximum of Calc/Exp 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  10. HCPB Breeder tritium production Average/Maximum of C/E values at each 12 pellet ENEA group 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  11. Finding Calculations of foil activation and tritium breeding for ITER relevant FNG integral experiments yield nearly similar results for FENDL-2.1 and ENDF/B-VII.0 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  12. FENDL-3/SLIB Starter Library • A starter library (FENDL-3/SLIB) was generated based on several agreed upon rules of creation • Replace present evaluations with updates • Adopt evaluations from libraries that contain standards (H-1 from ENDF) • Use isotopic evaluations where available • The library includes 88 isotopes with updated evaluations from ENDF/B-VII.0, JENDL-HE, JEFF-3.1, and BROND • Only evaluation switch between libraries occurred for H-1 and He-3 (JENDL-3.3  ENDF/B-VII.0) that could impact analysis of systems with water-cooling like ITER • Sn is the only material with elemental rather than isotopic evaluation • FENDL-3/SLIB materials • 47 from ENDF/B-VII.0 • 35 from JENDL-HE • 4 from JEFF-3.1 • 2 from BROND-2 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  13. Proposed Added Materials in FENDL-3 • Following the 1st RCM meeting in December 2008, we reviewed the list of material in the FENDL-2.1 general purpose data library regarding its completeness to satisfy the needs for fusion neutronics analysis • We solicited input from the fusion neutronics community for possible addition of materials that are needed and are missing from the FENDL-2.1 library • 17 elements were identified for consideration to be added in the new library to enhance its usefulness for the different fusion applications • We identified the application needed for each proposed material and gave a priority to help us with decision if we want to limit the number of materials added • Availability of evaluations for these elements was determined • In addition, 6 isotopes are missing from FENDL-2.1 and need to be considered for inclusion in FENDL-3   2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  14. 17 Elements Proposed for Addition in FENDL-3 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  15. 17 Elements Proposed for Addition in FENDL-3 (continued) 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  16. 17 Elements Proposed for Addition in FENDL-3 (continued) • These cover all materials requested by ITER (M. Loughlin) except Cs, U, Th, Np • Additional materials needed for IFMIF analysis were provided by U. Fischer 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  17. Six Isotopes Missing for Elements in FENDL-2.1 • Abundances for C-13 and Pb-204 are significant and inclusion in FENDL-3 should be considered • O-18 and V-50 have low abundances and no evaluations and could be ignored in FENDL-3 • Although O-17 and W-180 have very low abundances, evaluations exist for them and could be considered for FENDL-3 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  18. ITER Calculational Benchmark • To quantify impact of data changes, we performed MCNP calculations for a 1-D ITER calculational benchmark that was utilized during FENDL development process • Calculations carried out using FENDL-2.1 library, FENDL-2.1 with data for the 40 materials replaced by ENDF/B-VII.0, and the FENDL-3/SLIB library (release 2 posted 6/24/2009 designated SLIB2) • Results for flux, heating, dpa, and gas production were compared 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  19. Findings of Data Comparison Between ENDF/B-VI.8 and ENDF/B-VII.0 • Minor impact on ITER nuclear analysis is expected except for ITER-TBM nuclear analysis due to changes in data for Li-6, Pb-208, and F-19 • Effects of changes could be large in other fusion systems • Power plants with breeding blankets • Inertial fusion systems (e.g., H-3 and Au-197 data are important for ICF target neutronics) M.E. Sawan, “Benchmarking FENDL-2.1 with Impact of ENDF/B-VII.0 Release on Nuclear Heating and Damage,” Proceedings of the 23rd IEEE/NPSS Symposium on Fusion Engineering (SOFE), May 31-June 5, 2009, San Diego, CA, ISBN No. 978-1-4244-2636-2, IEEE Cat. No. CFP09SOF-CDR. Also University of Wisconsin Fusion Technology Institute Report, UWFDM-1361 (May 2009) M. Sawan, “Impact of ENDF/B-VII.0 Release on Fusion Evaluated Nuclear Data Library FENDL-2.1,” Fusion Science & Technology, vol. 56, pp 766-770 (August 2009) 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  20. Peak Neutron and Gamma Flux Results • Using ENDF/B-VII.0 data results in slightly higher flux values. However, the change is <1% with much smaller differences at the front FW zones facing the plasma • Using FENDL-3/SLIB2 results in much higher flux values particularly at the magnet that is heavily shielded by water-cooled SS shield and vacuum vessel 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  21. Neutron Spectra • Using FENDL-3/SLIB2 results in significantly softer neutron energy spectrum at the heavily shielded outboard magnet that yields enhanced gamma generation • At OB magnet E>0.1 MeV flux increases by only 3% while the E<0.1 MeV flux increases by 82% 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  22. Peak Nuclear Heating Results • While using ENDF/B-VII.0 data results in slightly higher heating values (<1%) using FENDL-3/SLIB2 results in much higher heating values particularly at the magnet • Most of increase in outboard magnet heating is due to gamma heating increase (21% increase vs. 5% increase in neutron heating) 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  23. Peak Magnet Nuclear Parameters • While using ENDF/B-VII.0 data results in slightly higher magnet parameters using FENDL-3/SLIB2 results in much higher parameters with the largest increase in magnet heating due to enhanced gamma production 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  24. FENDL-3/SLIB2 Calculations for FNG Bulk Shield Experiment • Small difference compared to FENDL-2.1 • Bulk shield mock-up thickness is much smaller than magnet shielding in ITER 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  25. FENDL-3/SLIB2 in Slabs of H2O, SS316 and SS/H2O (80/20) • To further investigate the increase in low energy (E<0.1 MeV) neutron flux observed in the ITER 1-D calculational benchmark with FENDL-3/SLIB2 we performed simple calculations for slabs with all water, all SS316, and SS316/H2O mixture • Compared neutron fluxes in the various slabs calculated with MCNPX using FENDL-2.1 versus FENDL-3/SLIB • Used isotropic 14.1 MeV neutron source 5% increase 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  26. FENDL-3/SLIB2 in Slabs of H2O, SS316 and SS/H2O (80/20) 30% increase 750% increase Observed large differences are not related to change in H data but are related to SS data 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  27. FENDL-3/SLIB2 in Mo Slab • Performed calculations for slabs made of each constituent element of SS316 • Largest difference obtained in Mo (JENDL-3.3JENDL-HE) 500% increase • Mo resonances are below 0.1 MeV compared to higher energy resonances for Fe • Resonance data might have changed or data processing with NJOY might have an error 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  28. Revised FENDL-3 Starter Library • Independent assessment by Andrej Trkov confirmed the large differences • An anomaly was noticed in plots of neutron emission spectra • The symptoms suggested that it is likely an NJOY processing problem which is very specific for the combination of data representation in the JENDL-HE files • A temporary patch to NJOY was proposed that solves processing problems for all affected materials • New processed ACE files were posted on 2/16/2010 • We performed calculations with the corrected FENDL-3 starter library designated FENDL-3/SLIB2a and compared results to FENDL-2.1 and the previous FENDL-3/SLIB2a 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  29. Peak Neutron and Gamma Flux Results with FENDL-3/SLIB2a • Using the corrected FENDL-3 starter library (FENDL-3/SLIB2a) removed the large overestimate at deep penetration locations • Neutron and gamma fluxes at VV and magnet that are heavily shielded by water-cooled SS are higher by 1-3% than predicted by FENDL-2.1 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  30. Neutron Spectrum at OB Magnet with FENDL-3/SLIB2a • Using FENDL-3/SLIB2a corrected the anomaly in low energy spectrum caused by wrong secondary energy spectra • Energy spectra from FENDL-3/SLIB2a and FENDL-2.1 are close with differences up to ~10% at E>2 MeV 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  31. H-1 Data in FENDL-3 vs. FENDL-2.1 Notable change in FENDL-3 is switch for H-1 from JENDL-3.3 to ENDF/B-VII.0 Lower (n,g) cross sections at high energy could be reason for higher neutron flux (particularly at high energy) in regions heavily shielded by water-cooled SS 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  32. Peak Nuclear Heating Results with FENDL-3/SLIB2a • Using the corrected FENDL-3 starter library (FENDL-3/SLIB2a) removed the large overestimate at deep penetration locations • Nuclear heating at magnet is higher by ~2% than predicted by FENDL-2.1 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  33. Peak Magnet Nuclear Parameters with FENDL-3/SLIB2a • Nuclear parameters at magnet are higher by ~1.5-3.5% than predicted by FENDL-2.1 • Largest differences are in fast neutron fluence and dpa that are determined by high energy flux 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  34. FENDL-3/SLIB2a in Slabs of SS/H2O (80/20) No large differences observed with corrected library (FENDL-3/SLIB2a) 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  35. FENDL-3/SLIB2a in Mo Slab No large differences observed with corrected library (FENDL-3/SLIB2a) 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

  36. Conclusions • Replacing the ENDF/B-VI.8 data in FENDL-2.1 by ENDF/B-VII.0 while keeping data from other evaluations unchanged resulted in minor change (<1%) in nuclear parameters for ITER relevant calculations • However, larger changes in calculated ICF target neutronics parameters and tritium breeding were observed in previous analysis • Calculations of foil activation and tritium breeding for ITER relevant integral experiments yield nearly similar results for FENDL-2.1 and ENDF/B-VII.0 • Using FENDL-3/SLIB2 instead of FENDL-2.1 resulted in large increase in nuclear parameters behind the thick water-cooled shield. This was identified as processing error and was corrected in FENDL-3/SLIB2a • Using FENDL-3/SLIB2a instead of FENDL-2.1 in ITER relevant calculations gives 2-4% higher nuclear parameters in regions that are heavily shielded with water-cooled SS (vacuum vessel, magnets) 2nd RCM on FENDL-3, 23-26 March 2010, IAEA, Vienna

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