ORNL Nuclear Data Evaluation Accomplishments for FY 2013
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1 ORNL Nuclear Data Evaluation Accomplishments for FY 2013 L. Leal, V. Sobes, M. Pigni, K. Guber, G. Arbanas, D. Wiarda, M. Dunn (ORNL) and E. Ivanov, T. Ivanova, E. Letang (Institut de Radioprotection et de Surete Nucleaire) 2014 ANS Winter Meeting November 9-14, 2014
2 OUTLINE Present ORNL nuclear data evaluation work to address NCSP nuclear data needs; Data analysis and evaluation performed with the computer code SAMMY. All evaluations done using LRF=7; ORNL and French institution collaboration: Institute for Radiological Protection and Nuclear Safety (IRSN); CIELO project; Conclusions; 2 Status of the Nuclear Data Measurement & Evaluation Program in paradigm the shift US
3 5 Year Plan NCSP Nuclear Data Work Plan
4 ORNL Resonance Evaluations and deliverables Energy Range Resonance Covariance Evaluation Target date to deliver the evaluation 63,65 Cu Thermal to 300 kev Yes Completed 182 W Thermal to 10 kev Yes FY W Thermal to 5 kev Yes FY W Thermal to 10 kev Yes FY W Thermal to 10 kev Yes FY Fe Thermal to 2 MeV Yes FY Pu Thermal to 2.5 kev Use ENDF/B- VII.1 (FILE33) 235 U Thermal to 2.25 kev Use ENDF/B- VII.1 (FILE33) Completed FY2014 Collaborative International Evaluated Library Organization CIELO 4 Status of the Nuclear Data Measurement & Evaluation Program in the US
5 Ca Ce Dy ORNL Planned Evaluations Energy Range 40 Ca (96.95 %) 44 Ca (2.086 %) 140 Ce ( %) 142 Ce ( %) 161 Dy ( %) 162 Dy ( %) Resonance Covariance Evaluation Yes Yes Yes Target date for delivery the evaluation FY2015 FY2015 FY Dy ( %) 164 Dy ( %) Gd 155 Gd (14.80 %) 156 Gd (20.47 %) Yes FY Gd (15.65 %) 158 Gd (24.84 %) 160 Gd (21.86 %) CH 2 Thermal Scattering S(α,β) - FY Status of the Nuclear Data Measurement & Evaluation Program in the US
6 56 Fe Evaluation in the Resolved Resonance Region up to 2 MeV New high resolution transmission measurements done at the RPI extending the resonance region up to 5 MeV (Yaron Danon) New inelastic cross-section measurements done at IRMM/GELINA (Arjan Plompen) Use the SAMMY/RML feature to include inelastic channel in the R-matrix analysis Compare the cross section processed with SAMMY, NJOY, AMPX, PREPRO, and GAIA using the evaluated iron resonance parameters 6 Status of the Nuclear Data Measurement & Evaluation Program in the US
7 Experimental Data for the n+ 56 Fe Interaction Reference Energy Range Facility TOF (meters) Measurement Harvey (1987) 20 kev 2 MeV ORELA Transmission Perey (1990) 120 kev 850 kev ORELA Transmission Cornelis (1982) 500 kev 2 MeV GELINA Transmission Danon (2012) (three thicknesses) 500 kev 2 MeV RPI Transmission Perey (1990) 850 kev 1.5 MeV ORELA Inelastic Plompen (2011) 850 kev 2 MeV GELINA Inelastic Spencer (1994) ) (two thicknesses) 10 ev 650 KeV ORELA 40.0 Capture Perey (1990) 850 kev 1.5 MeV ORELA elastic Cabé (1967) 500 kev 1.2 MeV Université de Louvain (Van de Graaff) ~ 1 elastic O.A.Shcherbakov (1977) ev 10 ev TOF/Russia 9.5 Total O.A.Shcherbakov (1977) ev 10 ev TOF/Russia 9.5 Capture 7 Status of the Nuclear Data Measurement & Evaluation Program in paradigm the shift US
8 Comparison of SAMMY Fits for Total and Inelastic 56 Fe data. 8 Status of the Nuclear Data Measurement & Evaluation Program in the US
9 Comparison of SAMMY Fits to Perey Differential Elastic 56Fe data 9 Status of the Nuclear Data Measurement & Evaluation Program in the US
10 ALARM-CF-FE-SHIELD ICSBEP Neutron and photon leakage spectra from Cf-252 source at the center of six iron spheres of diameters of 20, 30, 40, 50, 60, and 70-cm (IPPE, Russia) 10 Status of the Nuclear Data Measurement & Evaluation Program in the US
11 Particle Flux (1/cm**2) 56 Fe Benchmark Calculations Results cm (x10) 20 cm 70 cm (x1000) 1e Energy (MeV) 11 Status of the Nuclear Data Measurement & Evaluation Program in the US
12 235 U Issues and Resolutions: Issues: Overestimation of 235 U capture cross-section in the resonance region range (0.1 to 2.5 kev). Recommend: 1. New measurements of capture and fission cross-section in the kev region 2. Perform new resonance analysis in the 0.1 to 2.5 kev region 3. Investigate the reason for the overestimation of criticalities for some benchmarks 12 Status of the Nuclear Data Measurement & Evaluation Program in the US
13 Resolution: 235 U Issues and Resolutions: New data measurements from RPI (capture and fission yields) (kind of alpha measurements) New capture data from LANL Use SAMMY code for fitting the new data Test the new evaluation in benchmark calculations: ZEUS benchmarks Use JENDL4 as the template Benchmark Calculations done with MCNP with everything else from ENDF/B-VII.1 13 Status of the Nuclear Data Measurement & Evaluation Program in the US
14 Capture Cross Section (barns) RPI capture data and ENDF evaluation (SG29 prediction confirmed) ENDF/B RPI - Experiment Energy (ev) 14 Status of the Nuclear Data Measurement & Evaluation Program in the US
15 ORNL, RPI and LANL Capture Data m 20 ns m 15 ns m 125 ns 15 Status of the Nuclear Data Measurement & Evaluation Program in the US
16 RPI and LANL Capture Data m 15 ns m 125 ns 16 Status of the Nuclear Data Measurement & Evaluation Program in the US
17 Capture Yield Fit of the RPI Capture Data 0.1 RPI - Experiment Resonance Parameters (SAMMY) Energy (ev) 17 Status of the Nuclear Data Measurement & Evaluation Program in the US
18 Fission Yield Fit of the RPI Fission data RPI - Experiment Resonance Parameter (SAMMY) Energy (ev) 18 Status of the Nuclear Data Measurement & Evaluation Program in the US
19 ICSBEP Benchmark Calculations The HEU-MET-INTER-006 cases (ZEUS) Intermediate Energy Benchmark: Designed to test the 235 U cross sections in the intermediate energy range. ISCEB description: heu-met-inter (ZEUS1) heu-met-inter (ZEUS2) heu-met-inter (ZEUS3) heu-met-inter (ZEUS4) 19 Status of the Nuclear Data Measurement & Evaluation Program in the US
20 ICSBEP Benchmark Calculations The HEU-MET-INTER-006 cases (ZEUS) Designed to test the 235 U cross sections in the intermediate energy range; Critical experiments of highly enriched uranium platters moderated by graphite and reflected by copper. The experiments were done at the Los Alamos National Laboratory. They are included in the ICSBEP and identified as HEU-MET- INTER-006 and are referred to as ZEUS benchmark systems. 20 Status of the Nuclear Data Measurement & Evaluation Program in the US
21 21 Status of the Nuclear Data Measurement & Evaluation Program in the US
22 Vertical Slice through the ZEUS assembly 22 Status of the Nuclear Data Measurement & Evaluation Program in the US
23 The HEU-MET-INTER-006 cases (ZEUS) Case Number k eff EALF (kev) Intermediate-Energy Fission Fraction 1 (ZEUS1) (ZEUS2) 3 (ZEUS3) 4 (ZEUS4) EALF: Energy Average Lethargy Causing Fission 23 Status of the Nuclear Data Measurement & Evaluation Program in the US
24 The HEU-MET-INTER-006 cases (ZEUS) Case Number k eff EALF (kev) Intermediate-Energy Fission Fraction 1 (ZEUS1) (ZEUS2) 3 (ZEUS3) 4 (ZEUS4) EALF: Energy Average Lethargy Causing Fission 24 Status of the Nuclear Data Measurement & Evaluation Program in the US
25 The HEU-MET-INTER-006 cases (ZEUS) Case Number 1 (ZEUS1) 2 (ZEUS2) 3 (ZEUS3) 4 (ZEUS4) Benchmark k eff Calculated k eff ENDF/B-VII.0 JENDL4 ORNL Status of the Nuclear Data Measurement & Evaluation Program in the US
26 The HEU-MET-INTER-006 cases (ZEUS) EALF 4.45 kev 9.45 kev 22.8 kev 80.8 kev 26 Status of the Nuclear Data Measurement & Evaluation Program in the US
27 Summary of Evaluation Accomplishments ORNL resonance evaluations on schedule per the NCSP Five Year Plan 63,65 Cu evaluations completed and delivered to NNDC Vladimir Sobes completed Ph.D. dissertation Completed measurement and resonance analysis work for 4 tungsten isotopes ( 182,183,184,186 W) evaluations delivered to NNDC Completed novel work on 56 Fe resonance evaluation to produce angular distributions from resonance parameters Resonance parameters represented very the differential experimental data Benchmark testing with IRSN showing excellent results Completed preliminary 235 U evaluation Includes new measured data from RPI and LANSCE in the low kev region Testing in progress to finalize the evaluation within the CIELO project 27 Status of the Nuclear Data Measurement & Evaluation Program in the US
28 Conclusions Evaluations on the schedule according to the five year plan; Evaluation sent to BNL for inclusion in ENDF; Plan for future evaluations pretty much in the NCSP five year plan schedule; 28 Status of the Nuclear Data Measurement & Evaluation Program in the US
29 29 Status of the Nuclear Data Measurement & Evaluation Program in the US Questions???
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