ENDF/B-VII.1 and its covariances

Transcription

1 ENDF/B-VII.1 and its covariances Mike Herman National Nuclear Data Center Brookhaven National Laboratory Brookhaven Science Associates

2 ENDF/B-VII.0 ENDF/B-VII.1 Release December years after ENDF/B-VII.0 Major improvements: structural materials minor actinides covariances (110 materials for AFCI eliminating some deficiencies fixing errors 331 citations (SCOPUS) Roadmap: beta0 version November 2010 beta1 version January 2011 beta2 version February 23, 2011 beta3 version May 2011 release & paper December 2011

3 Major Changes Planned for ENDF/B-VII.1 1. Covariances (VII.0: 4% => VII.1: 30%) (BNL, ORNL, LANL) 2. Light nuclei based on R matrix work at LANL (4He, 6Li, 9Be, 16O) 3. Structural materials: 3.1. New evaluations supported by criticality safety (ORNL) 3.2. Improvements to thermal cross sections (BNL) 4. Pu fission products yields, delayed neutrons, gamma data (LANL, LLNL) 5. Actinides a few new evaluations for minor actinides, improvements to fission, capture, (n2n) using feedback from critical assembly reaction rate data, and data from LANSCE, CERN etc (LANL) 6. Many new JENDL-4 data adopted for Minor Actinides 3

4 ENDF/B-VII.1beta2 (neutron sublibrary) Total number of materials 418 New or revised materials 168 Totally or partially new materials 62 - LANL 10 - LANL/ORNL 8 - ORNL 10 - ORNL/IAEA 6 - BNL 3 - LLNL 8 - IRMM (Geel, Belgium) 7 Thermal x-sec adjustment BNL 10 Other fixes 21 Adopted: 75 - JENDL-3.3 (R.Q. Wright corr.) 2 - JENDL JEFF-3.3 (R.Q. Wright corr.) 4 4

5 New or partially new evaluations in beta2 He-4 Li-6 Be-9 O-16 F-19 Na-23 Cl-35 Cl-37 K-39 K-41 Ti-46 Ti-47 Ti-48 Ti-49 Ti-50 New R-matrix analysis by LANL New R-matrix evaluation by LANL using WNR data New evaluation by LANL New R-matrix evaluation by LANL including covariances New MF2/32 evaluation by ORNL New full range evaluation by BNL New R-Matrix Limited MF2/32 evaluation by ORNL New MF2/32 evaluation by ORNL New MF2/32 evaluation by ORNL New MF2/32 evaluation by ORNL New fast neutron region and covar. by LANL, new MF32 by ORNL New fast neutron region and covar. by LANL, new MF32 by ORNL New fast neutron region and covar. by LANL, new MF32 by ORNL New fast neutron region and covar. by LANL, new MF32 by ORNL New fast neutron region and covar. by LANL, new MF32 by ORNL 5

6 New or partially new evaluations in beta2 V-51 New fast neutron region and covariances by LANL, MF2 from JENDL-4 Cr-50 New MF2/32 by ORNL Cr-52 New MF2/32 by ORNL Cr-53 New MF2/32 by ORNL Cr-54 New MF2/32 by ORNL Mn-55 New MF2/32 by ORNL, new fast neutron region and covar. by IAEA Ni-58 New MF2/32 by ORNL, updated a-production, various corrections Ni-62 New MF2 evaluation by BNL Kr-78 New fast neutron region by LLNL merged with MF2 from ENDF/B-VII.0 Y-89 New evaluation for total and capture by LANL Zr-90 New MF2 by BNL, bound level at -234 kev removed Cd-106,108,110,111,112,114,116 New MF2 from IRMM Xe-123, 124 New fast neutron region by LLNL, various fixes by BNL Ta-180, 181 New fast neutron region by LLNL, various fixes by BNL 6

7 New or partially new evaluations in beta2 W-180, 182, 183, 184, 186 New MF2/32 by ORNL, new fast neutron region + covariances by IAEA Re-185, 187 New fast neutron region by LLNL with BNL fixes U-235 LANL reverted dn 6-grp to ENDF/B-VI.8, new MF33 evaluation by ORNL/LANL, PFNS (MF5,MT18) on finer grid U-237 New LANL (Phil Young) fast neutron region and dn 6-grp reverted to ENDF/B-VI.8 U-238 LANL reverted dn 6-grp to ENDF/B-VI.8, new MF33 evaluation by ORNL/LANL U-239 New fast neutron region by LLNL with MF2 estimated by A. Trkov BNL Pu-238 New fast neutron region by LANL (P.G.Young et al.) Pu-239 New MF35,MF31,PFNS by LANL, new MF33 by ORNL/LANL, LANL reverted dn 6-grp to /B-VI.8, BNL extended URR to 30keV, Pu-240 New fast neutron region by LANL including MF31,33,35 Am-241 New evaluation and covariance matrices by T. Kawano LANL 7

8 ENDF/B-VII.1 beta2 verification at BNL R. Arcilla conformance to ENDF format NNDC Linux Cluster simple physics & conformance to recommended procedures complicated physics producibility of ACE files for neutronics calculations ability to perform simple neutronics calculations (GODIVA) CHECKR, FIZCON, PSYCHE can be downloaded from

9 ENDF/B-VII.1 beta2 verification at BNL Updates of checking codes were needed to process all new evaluations Number of formal errors in evaluations corrected In a few cases authors asked to revise the files Checking VIEWR plots critical F-19 and Cl-35 (R-Matrix Limited format) need NJOY-2009 or Verification chain run several times over the whole library Help from LLNL - conversion of beta2 into XENDL format and back revealed hidden errors in VII.0 (MF14) Checking physics consistency (case of Cr isotopes) 9

10 Thermal capture comparison Atlas/ENDF/B-VII He 10B 17O 43Ca 58Co Thermal Capture Cross Sections 90Zr 92Mo 110Pd 86Kr 239Np 232Pa 242Am 236Pu 250Bk low- and medium-z: poor experimental data (comparison of theoretical calculations) He-3, Said adopted Wolfs data; VII.1 is in between Wolfs and Alfimenkov Co-58 deficiency in VII.1 Zr-90 evaluation update high-z region: new evaluations from the Actinoid file Z 10

11 Thermal fission comparison Thermal Fission Cross Sections ENDFB-VII.0/ENDFB-VII Ac 228Th 232Pa 235Np 242Pu 237U 246Cm 241Cm 250Cm 242Cm 255Es Actinoid file vs. previous ENDF/B-VII.0 evaluations Cm Z 11

12 Capture Resonance Integrals ENDFB-VII.0/ENDFB-VII Ac Thermal Fission Cross Sections 255Es 246Cm 228Th 241Cm 232Pa 235Np 250Cm 242Pu 237U 242Cm evaluation updates, lack of recent measurements or importance for ENDF libraries. O-16 will be fixed O-17 no experimental data Si-30, Pb-208 deficiencies in kevregion Co-58 deficiencies Cm Z 12

13 Fission Resonance Integrals ENDF/B-VII.0/ENDF/B-VII Th Fission Resonance Integrals 251Cf 255Fm 242,249Cm 237U 235Np 254Cf 239U JENDL-4.0 Actinoid file vs. previous ENDF/B-VII.0 evaluations. 250Cf Z 13

14 Maxwellian-averaged Cross Sections (KADONIS/VII.1beta2) KADONIS/ENDFB-VII He 16O 9Be C-0 33S 30Si 28Si 38Ar 31P Maxwellian-averaged Capture, kt=30 kev 48Ca 46Ca 36S 64Ni 82Se 115mCd 143Pr 149Pm 141Ce 148mPm 196Hg O-16, C-0 will be fixed, Ca-46,48 deficiencies would not affect the ENDF validation procedures small Cd-46,48 isotopic abundances Be-9 lack of experimental data at 30 kev He-3 deficiencies in the kev-region S-36, Ar-38, Se-82 no experimental data Z 14

15 Westcott Factors ENDFB-VII.0/ENDFB-VII Capture Westcott Factors 239U 123Xe 227Ac 166mHo 167Er 250Bk 254Es 176Lu U-239 fixed (from 4 to 1) Lu-176 fixed (from 1 to 1.75 (1.76 in Atlas)) c) Xe-123 no experimental data Actinoid file file vs. VII.0 evaluations Z 15

16 Corrections resulting from comparison ENDF Request 19605, 2011-Apr-26,14:50:05 EXFOR Request: 16124/1, 2011-Apr-26 14:50:19 ENDF Request 19606, 2011-Apr-26,14:52: Cross Section (barns) natc(n,g) Cross Section (barns) O(n,g) Incident Energy (MeV) Incident Energy (MeV) ENDF Request 19607, 2011-Apr-26,14:58:32 EXFOR Request: 16125/1, 2011-Apr-26 14:58:46 Cross Section (barns) Co(n,g) Incident Energy (MeV) 16

17 Validation highlights Be-9: mixed improvement - some improved other worse O-16: good performance (at least as good as VII.0) Ti: improved V-51: not worse than VII.0 Mn-55: improved Cd: mixed - k-eff improved but bias increased W: consistently improved Gd-157: mixed results 17

18 Covariances in ENDF/B-VII.1 AFCI effort by BNL and LANL List of nuclei in AFCI (priority materials in bold) 1 H 28 Si 92 Mo 109 Ag 149 Sm 232 Th 2 H 29 Si 94 Mo 127 I 151 Sm 233 U 4 He 30 Si 95 Mo 129 I 152 Sm 234 U 6 Li 50 Cr 96 Mo 131 Xe 153 Eu 235 U 7 Li 52 Cr 97 Mo 132 Xe 155 Eu 236 U 9 Be 53 Cr 98 Mo 134 Xe 155 Gd 238 U 10 B 55 Mn 100 Mo 133 Cs 156 Gd 237 Np 11 B 54 Fe 99 Tc 135 Cs 157 Gd 238 Pu 12 C 56 Fe 101 Ru 139 La 158 Gd 239 Pu 15 N 57 Fe 102 Ru 141 Ce 160 Gd 240 Pu 16 O 58 Ni 103 Ru 141 Pr 166 Er 241 Pu 19 F 60 Ni 104 Ru 143 Nd 167 Er 242 Pu 23 Na 90 Zr 106 Ru 145 Nd 168 Er 241 Am 24 Mg 91 Zr 103 Rh 146 Nd 170 Er 242m Am 25 Mg 92 Zr 105 Pd 148 Nd 204 Pb 243 Am 26 Mg 93 Zr 106 Pd 147 Pm 206 Pb 242 Cm 27 Al 94 Zr 107 Pd 207 Pb 243 Cm 95 Zr 108 Pd 208 Pb 244 Cm 96 Zr 209 Bi 245 Cm 95 Nb 246 Cm AFCI/GNEP project covariances, which will serve as a reference for constructing ENDF-6 formatted covariance files for ENDF/B-VII.1 LANL - light nuclei, actinides, fission spectra. BNL - structural materials, Na, minor actinides, and all the rest including RR. Covariances expected in beta3 to be released in May

19 AFCI covariance data migrated to ENDF/B-VII.1-β Transfer of MF33 data with no (or minor) modifications to files without pre-existing covariances: H-1,2, Li-6, Be-9, B-10,11, C-0, N-15, Mg-24,25,26, Al-27, Si-28,29,30, Ni-60, Mo-92,94,95,96,97,98,100, Zr-90,91,92,93,94,95,96, Nb-95, Ru-101,102,103,104,106, Ag-109, Cs-133,135, Pr-141, Nd-143,145,146,148, Pb-204,206,207,208, Bi

20 AFCI covariance data migrated to ENDF/B-VII.1-β Transfer of MF33 data with reduced optical peaks in fast region, no pre-existing covariance data: Pd-105,106,107,108, I-127,129, La-139, Ce-141, Pm-147, Sm-149,151,152, Xe-131,132,134, Eu-153,155, Er-166,167,168,170 Merge of AFCI MF33 data with existing MF32 data: Cr-50,52,53, Ni-58 Merge of AFCI MF33 data where differences between VII.0 and VII.1 may be larger than report uncertainties: Fe-54,56,57 20

21 AFCI covariance data migrated to ENDF/B-VII.1-β AFCI actinide MF33 data adopted into files with no prior covariances: Am-241m,243 (minor fixes), Np-237, U-236 (with minor LANL-approved fix) New LANL fission (MF33/MT18) evaluation supplemented with AFCI covariances: Pu

22 What are we interested in? Measurements of thermal, resolved resonance and unresolved resonance regions (see Said s presentation) Measurements of elastic and inelastic cross sections up to 20 MeV inelastic cross sections close to thresholds (Zr!) elastics data for low incident energies (say <1MeV) Reliable estimate of systematic uncertainties in resonance region 22

23 Plans for beta3 and ENDF/B-VII.1 Deadline for submissions to beta3: May 1 beta3 release beginning of May Full set of AFCI covariances in beta3 beta3 = ENDF/B-VII.1 except covariance improvements and clerical fixes Substantive changes only for V improve integral preformance 243-Am(n,2n) total cross section (isomeric ratio is OK) 23-Na needs to be replaced by BNL 143-Nd thermal & resonance region (Mughabghab) Testing needed Zr, Hf (naval programs) 23