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REVIEW OF RESULTS FOR THE OECD/NEA PHASE VII BENCHMARK: STUDY OF SPENT FUEL COMPOSITIONS FOR LONG-TERM DISPOSAL
Georgeta Radulescu John Wagner (presenter)Oak Ridge National Laboratory
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing, and Disposition
Organized by: Nuclear Safety Council of Spain (CSN) and the International Atomic Energy Agency (IAEA)
October 27 – 30, 2009, Cordoba, Spain
Outline
• Overview of the benchmark specification
• Participating organizations, computer codes, and nuclear data
• Results– Decay calculations for selected isotopes– Criticality calculations
• Sensitivity calculations
• Summary Remarks / Observations
2 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
3
Overview of the benchmark specification (1/2)
• Purpose– Study the ability of relevant computer codes and associated
nuclear data to predict spent fuel isotopic compositions and corresponding keff values in a cask configuration over the time duration relevant to SNF disposal
• Objective– Improve understanding and confidence in our ability to predict
keff and source terms for timeframes relevant to long-term disposal of SNF
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
4
Overview of the benchmark specification (1/2)
• Specification (issued Nov 2008)– http://www.nea.fr/html/science/wpncs/buc/specifications/phase-VII/Phase-VII_BenchmarkSpecification_REV01.pdf
– PWR UO2 discharge fuel compositions for decay calculations• 4.5-wt% 235U initial enrichment and 50 GWd/MTU burnup • Isotopes relevant to burnup credit and public dose as well as their
precursors (113 total isotopes)– Representative cask model for keff calculations
• Borrowed from previous benchmark specifications
• Requested results– Predicted isotopic concentrations for 30 time steps (0 – 1 M yrs)– Predicted keff values for each time step
• Actinide-only (11 total isotopes) fuel compositions• Actinide and fission product (30 total isotopes) fuel compositions
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Excerpts from benchmark specification
5 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Excerpts from benchmark specification
6 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Excerpts from benchmark specification
7 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
8
Participating Organizations and Computer Codes/Data Used
Country Organization Decay Code Decay Data Library
Criticality Code
Cross-section Data Library
Slovakia VUJE a SCALE 5.1/ ORIGEN-S
ENDF/B-VI and V SCALE 5.1/KENO VI
ENDF/B-V, 44 energy groups (EGs)
USA ORNL b SCALE 6/ ORIGEN-S(CCC-750)
ENDF/B-VI and V SCALE 6/ KENO V.a
ENDF/B-VII.0, continuous energy (CE)
Japan JAEA c ORIGEN2.2UPJ(NEA-1642)
ORLIB33 d MCNP-4C2 JENDL3.3, CE
Sweden E Mennerdahl Systems
SCALE6/ ORIGEN-S
ENDF/B-VI and V SCALE 6/ KENO V.a
ENDF/B-VII.0, CE
Spain DENIM/CSN/ SEA Ingenieriae
ACAB V2008(NEA-1839)
JEFF-3.1 MCNPX-2.5 JEFF-3.1.1, CE
MCNPX-2.4.0 ENDF/B-VI, CE
ACAB V2008 From ORIGEN-S MCNPX-2.5 JEFF-3.1.1, CE
France AREVA-TN DARWIN 2.1 JEF-2.2 CRISTAL V1.0 JEF-2.2, 172 EGsa Nuclear Power Plant Research Institute Trnava Inc, VUJEb Oak Ridge National Laboratoryc Japan Atomic Energy Agency d JNDC FP nuclear data library and JENDL3.3e Additional criticality calculations and analyses were provided by these organizations to be included as an Annex to the final report.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
9
Participating Organizations and Computer Codes/Data Used
Country Organization Decay Code Decay Data Library
Criticality Code
Cross-section Data Library
France IRSN a DARWIN 2.0 JEF-2 MORET 5 b JEFF-3.1, CE
PHOENIX 1.0.0a b
DECAY.LIB ( ORGEN2.2 )
N/A N/A
Germany GRS c ORIGEN-X-2008
ENDF/B-VI SCALE 6/ KENO V.a
ENDF/B-VII.0, 238 EGs
Czech Republic
Nuclear Research Institute at Rez
SCALE 6/ ORIGEN-S
ENDF/B-VI and V
SCALE 6/ KENO V.a
ENDF/B-VII.0, 238 EGs
SCALE 6/ KENO V.a
ENDF/B-VII.0, CE
Finland VTT d SCALE 6/ ORIGEN-S
ENDF/B-VI and V
MCNP5, version 1.40
ENDF/B-VI, CE
Hungary KFKI e SCALE 6/ ORIGEN-S
ENDF/B-VI and V
MCNP5 ENDF/B-VI.2 and V, CE
TIBSO(NEA-1592)
JEF-2.2 MCNP5 ENDF/B-VI.2 and V, CE
a Institut de Radioprotection et de Sûreté Nucléaireb Under developmentc Gesellschaft für Anlagen-und Reaktorsicherheit mbHd VTT Technical Research Centre of Finlande KFKI Atomic Energy Research Institute
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Summary: Participation
• 11 countries, 13 organizations, 14 decay calculations, 15 criticality calculations• ORIGEN, ORIGEN-based, DARWIN, PHOENIX decay calculation codes
– Numerical and analytical methods for solving decay chain equations• Matrix exponential method (ORIGEN, PHOENIX)• Analytical method and 4th order Runge Kutta numerical method (DARWIN, PHOENIX)
– Decay data libraries• ENDF/B-V, VI• JENDL3.3• JEFF-3.1• JEF-2.2
• SCALE, MCNP, MORET Monte Carlo criticality codes– Neutron cross-section data libraries
• ENDF/B-V, 44 energy groups• ENDF/B-VI continuous energy• ENDF/B-VII.0 continuous energy• ENDF/B-VII.0 238 energy groups• JEF-2.2, 172 energy groups• JENDL3.3 continuous energy• JEFF-3.1 continuous energy• JEFF-3.1.1 continuous energy
10 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
ISOTOPIC RESULTS
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 11
Time-dependent Actinide Concentrations
13 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
14
Comparison of Decay Calculation Results for U-233
Note: ORIGEN-X-2008 results were obtained using 3 different runs and were affected by the choice of one big time step for the beginning of the second (150 years) and third (20,000 years) runs.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
15
Comparison of Decay Calculation Results for U-235
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
16
Comparison of Decay Calculation Results for Pu-241
241Pu (14.4y) → 241Am (432.7y)241Pu result variability for the first 200 years after fuel discharge indicates differences in 241Pu half-life values.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Time-dependent FP Concentrations
17 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
18
Comparison of Decay Calculation Results for Sm-151
Note: Different trends between the results obtained with JEF and JENDL decay libraries (DARWIN, TIBSO, and ORIGEN2.2UPJ) and the other results.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
19
Comparison of Decay Calculation Results for Eu-151
Note: Different trends between the results obtained with JEF and JENDL decay libraries (DARWIN, TIBSO, and ORIGEN2.2UPJ) and the other results. 151Sm (90y) → 151Eu.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
20
Comparison of Decay Calculation Results for Gd-155
Note: DARWIN, TIBSO, and PHONIX 1.0.0a beta results are lower than the results of the other calculations for short decay times. 155Eu (4.75 y) →155Gd.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
CRITICALITY RESULTS
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 21
keff Values – difference from mean
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 22
-0,008
-0,006
-0,004
-0,002
0,000
0,002
0,004
0,006
0,008
1 3 5 7 9 11 13 15
Fresh Fuel: Mean=1.1481; StdDev=0.0031
Act: Mean=0.9551; StdDev=0.0025
Act + FP: Mean=0.8610; StdDev=0.0021
1: SCALE 5.1 (ENDF/B-V, 44EGs)2: SCALE 6 (ENDF/B-VII.0, CE)3: MCNP-4C2 (JENDL3.3)4: SCALE6 (ENDF/B-VII.0, CE)5: MCNPX-2.5 (JEFF-3.1.1, CE)6: MCNPX-2.4.0 (ENDF/B-VI, CE)7: MCNPX-2.5 (JEFF-3.1.1, CE)8: CRISTAL V1.0 (JEF 2.2, 172 EGs)9: MORET 5 (JEFF-3.1)10: SCALE 6 (ENDF/B-VII.0, 238 EGs)11: SCALE 6 (ENDF/B-VII.0, 238 EGs)12: SCALE 6 (ENDF/B-VII.0, CE)13: MCNP5 V1.40 (ENDF/B-VII, CE)14: MCNP5 (ENDF/B-VI.2, CE)15: MCNP5 (ENDF/B-VI.2, CE)
23
keff as a Function of Decay Time for Actinide-only Fuel Compositions
Actinide-only Fuel Compositions
0.84
0.85
0.86
0.87
0.88
0.89
0.9
0.91
0.92
0.93
0.94
0.95
0.96
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Decay Time (years)
keff
SCALE 5.1/KENO VI (ENDF/B-V, 44 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP-4C2 (JENDL3.3)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (JEFF-3.1)
MCNPX-2.4.0 (ENDF/B-VI); ACAB (JEFF-3.1)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (ORIGEN-S)
CRISTAL V1.0 (JEF 2.2, 172 EGs)
MORET 5 (JEFF-3.1)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP5 V1.40 (ENDF/B-VI, CE)
MCNP5 (ENDF/B-VI.2, CE); ORIGEN-S
MCNP5 (ENDF/B-VI.2, CE); TIBSO
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
24
keff Result Variability as a Function of Decay Time
Actine-only Fuel Compositions
-1.00%
-0.80%
-0.60%
-0.40%
-0.20%
0.00%
0.20%
0.40%
0.60%
0.80%
1.00%
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Decay Time (years)
(kef
f -
keff
_ave
rag
e)/k
eff_
aver
age
(%)
SCALE 5.1/KENO VI (ENDF/B-V, 44 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP-4C2 (JENDL3.3)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (JEFF-3.1)
MCNPX-2.4.0 (ENDF/B-VI); ACAB (JEFF-3.1)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (ORIGEN-S)
CRISTAL V1.0 (JEF 2.2, 172 EGs)
MORET 5 (JEFF-3.1)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP5 V1.40 (ENDF/B-VI, CE)
MCNP5 (ENDF/B-VI.2 and V, CE); ORIGEN-S
MCNP5 (ENDF/B-VI.2 and V, CE); TIBSO
Δkeff-min = 0.0062 (150 years)Δkeff-max = 0.0153 (1,000,000 years)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Actinide-only keff Values – Mean and Standard Deviation as a Function of Decay Time
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 25
0,0000
0,0005
0,0010
0,0015
0,0020
0,0025
0,0030
0,0035
0,0040
0,0045
0,8400
0,8600
0,8800
0,9000
0,9200
0,9400
0,9600
0,01 0,1 1 10 100 1000 10000 100000 1000000
keff
26
keff as a Function of Decay Time for Actinide and FP Fuel Compositions
Actinide and FP Fuel Compositions
0.73
0.74
0.75
0.76
0.77
0.78
0.79
0.8
0.81
0.82
0.83
0.84
0.85
0.86
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Decay Time (years)
keff
SCALE 5.1/KENO VI (ENDF/B-V, 44 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP-4C2 (JENDL3.3)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (JEFF-3.1)
MCNPX-2.4.0 (ENDF/B-VI); ACAB (JEFF-3.1)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (ORIGEN-S)
CRISTAL V1.0 (JEF 2.2, 172 EGs)
MORET 5 (JEFF-3.1)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP5 V1.40 (ENDF/B-VI, CE)
MCNP5 (ENDF/B-VI.2, CE)
MCNP5 (ENDF/B-VI.2, CE)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
27
keff Result Variability as a Function of Decay Time
Actine and FP Fuel Compositions
-1.20%
-1.00%
-0.80%
-0.60%
-0.40%
-0.20%
0.00%
0.20%
0.40%
0.60%
0.80%
1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Decay Time (years)
(kef
f - k
eff_
aver
age)
/kef
f_av
erag
e (%
)
SCALE 5.1/KENO VI (ENDF/B-V, 44 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP-4C2 (JENDL3.3)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (JEFF-3.1)
MCNPX-2.4.0 (ENDF/B-VI); ACAB (JEFF-3.1)
MCNPX-2.5 (JEFF-3.1.1, CE); ACAB (ORIGEN-S)
CRISTAL V1.0 (JEF 2.2, 172 EGs)
MORET 5 (JEFF-3.1)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, 238 EGs)
SCALE 6/KENO V.a (ENDF/B-VII.0, CE)
MCNP5 V1.40 (ENDF/B-VI, CE)
MCNP5 (ENDF/B-VI.2 and V, CE); ORIGEN-S
MCNP5 (ENDF/B-VI.2 and V, CE); TIBSO
Δkeff-min = 0.0059 (20 and 40 years)Δkeff-max = 0.0112 (45,000 years)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Cross-section Data Sensitivity and Uncertainty Analysis
ENDF/B-VII Neutron Cross-Section DataActinide and Fission Product Compositions
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 28
SCALE/TSUNAMI Cross-section Sensitivity and Uncertainty Analysis
• SCALE ENDF/B-VII 238 energy-group library• Covariance data from ENDF/B-VII, ENDF/B-VI and
JENDL3.3 • Energy and region integrated keff sensitivity to total and
reaction-specific cross section (sensitivity coefficient)
• keff uncertainty due to cross-section covariance data
nx
nx
effeff,k /
k/kS n
x ΣΣδ
δΣ =
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 29
keff Sensitivity to ENDF/B-VII Cross-section Data for Actinides
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 31
keff Sensitivity to ENDF/B-VII Cross-section Data for FPs
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 32
keff Uncertainty Due to Cross-section Covariance Data
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 33
Main Contributions to keff Uncertainty: 5-Year Composition
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 34
Main Contributions to keff Uncertainty: 100-Year Composition
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 35
Main Contributions to keff Uncertainty: 100,000-Year Composition
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 36
Summary Remarks / Observations
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 37
Summary: Participation • 11 countries, 13 organizations, 14 decay calculations, 15 criticality calculations• ORIGEN, ORIGEN-based, DARWIN, PHOENIX decay calculation codes
– Numerical and analytical methods for solving decay chain equations• Matrix exponential method (ORIGEN, PHOENIX)• Analytical method and 4th order Runge Kutta numerical method (DARWIN, PHOENIX)
– Decay data libraries• ENDF/B-V, VI• JENDL3.3• JEFF-3.1• JEF-2.2
• SCALE, MCNP, MORET Monte Carlo criticality codes– Neutron cross-section data libraries
• ENDF/B-V, 44 energy groups• ENDF/B-VI continuous energy• ENDF/B-VII.0 continuous energy• ENDF/B-VII.0 238 energy groups• JEF-2.2, 172 energy groups• JENDL3.3 continuous energy• JEFF-3.1 continuous energy• JEFF-3.1.1 continuous energy
38 International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
39
Preliminary Observations: Decay Calculations
• Several different trends identified– Different trends between the results obtained with JENDL and
ORIGEN2 DECAY.LIB data libraries (ORIGEN2.2UPJ and PHOENIX 1.0.0a) and the other results for
• 239Pu, 240Pu, 242Pu, 242mAm– Different trends among the results obtained with different libraries for
• 241Pu, 243Am– Different trends between the results obtained with JEF and JENDL
decay data libraries (DARWIN, TIBSO, and ORIGEN2.2UPJ) and the other results for
• 151Sm, 151Eu– Different trends between the results obtained with JEF and ORIGEN2
DECAY.LIB data libraries (DARWIN, TIBSO, and PHOENIX 1.0.0a) and the other results for
• 155Gd (155Eu)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
40
Preliminary Observations: Criticality Calculations
• keff calculations were performed using a variety of criticality codes and cross-section data
• Results for specified compositions provide insights into variations due to criticality code and cross-section data– Fresh fuel composition
• keff varied from 1.1429 ± 0.0008 (SCALE 5.1, ENDF/B-V 44 EGs) to 1.1540 ± 0.0003 (CRISTAL V1.0, JEF-2.2, 172 EGs)
– Discharge actinide-only fuel composition• keff varied from 0.9507 ± 0.0004 (SCALE 6, ENDF/B-VII.0 CE) to 0.9582 ±
0.0003 (MCNPX-2.5, JEFF-3.1.1 CE)– Discharge actinide and FP fuel composition
• keff varied from 0.8568 ± 0.0003 (SCALE 6, ENDF/B-VII.0 CE) to 0.8639 ±0.0005 (MCNP-4C2, JENDL3.3 CE)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
41
Preliminary Observations: Criticality Calculations
• keff results for time-dependent compositions show the impact of nuclear data, calculation method, and isotopic composition bias
• Computational method and cross-section data appear to have a larger impact on keff than differences in isotopic composition predictions
• keff results for time-dependent actinide-only compositions• Δkeff-min = 0.0062 (150 years)• Δkeff-max = 0.0153 (1,000,000 years)
• keff results for time-dependent actinide and FP compositions• Δkeff-min = 0.0059 (20 and 40 years)• Δkeff-max = 0.0112 (45,000 years)
• keff uncertainty due to covariance data• Min %Δkeff/ keff = 0.4845 (100,000 years)• Max %Δkeff/ keff = 0.7601 (100 years)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
Next steps
• Complete analysis of participant’s results• Communicate with participants about their results,
as needed
• Perform sensitivity calculations for isotopic predictions
• Complete and circulate draft report to participants for review
• Propose follow-up activity, if identified• Publish benchmark report
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 42
Backup Slides
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009 43
44
Comparison of Decay Calculation Results for U-234
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
45
Comparison of Decay Calculation Results for Np-237
241Pu (14.4y) → 241Am (432.7y) → 237Np (2.14E6y)
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
46
Comparison of Decay Calculation Results for Pu-239
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
47
Comparison of Decay Calculation Results for Pu-240
Note: Different trends between ORIGEN2.2UPJ and PHONIX 1.0.0a beta results and the results of the other calculations for long decay times.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
48
Comparison of Decay Calculation Results for Pu-242
Note: Different trends between ORIGEN2.2UPJ and PHONIX 1.0.0a beta results and the results of the other calculations for long decay times.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
49
Comparison of Decay Calculation Results for Am-241
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
241Pu (14.4y) → 241Am (432.7y)
50
Comparison of Decay Calculation Results for Am-242m
Note: Different trends between ORIGEN2.2UPJ and PHONIX 1.0.0a beta results and the results of the other calculations for long decay times.
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
51
Comparison of Decay Calculation Results for Am-243
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
52
Comparison of keff Values for the Fresh Fuel Composition
Fresh Fuel Composition
1.14
1.142
1.144
1.146
1.148
1.15
1.152
1.154
1.156
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Criticality Calculation No.
keff
1: SCALE 5.1 (ENDF/B-V, 44EGs)2: SCALE 6 (ENDF/B-VII.0, CE)3: MCNP-4C2 (JENDL3.3)4: SCALE6 (ENDF/B-VII.0, CE)5: MCNPX-2.5 (JEFF-3.1.1, CE)6: MCNPX-2.5 (ENDF/B-VI, CE)7: MCNPX-2.5 (JEFF-3.1.1, CE)8: CRISTAL V1.0 (JEF 2.2, 172 EGs)9: MORET 5 (JEFF-3.1)10: SCALE 6 (ENDF/B-VII.0, 238 EGs)11: SCALE 6 (ENDF/B-VII.0, 238 EGs)12: SCALE 6 (ENDF/B-VII.0, CE)13: MCNP5 V1.40 (ENDF/B-VI, CE)
keff-max – keff-min = 0.01109
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
53
Comparison of keff Values for Discharge Actinide-only Fuel Composition
Discharge Actinide-only Fuel Composition
0.95
0.951
0.952
0.953
0.954
0.955
0.956
0.957
0.958
0.959
0.96
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Criticality Calculation No.
keff
1: SCALE 5.1 (ENDF/B-V, 44EGs)2: SCALE 6 (ENDF/B-VII.0, CE)3: MCNP-4C2 (JENDL3.3)4: SCALE6 (ENDF/B-VII.0, CE)5: MCNPX-2.5 (JEFF-3.1.1, CE)6: MCNPX-2.4.0 (ENDF/B-VI, CE)7: MCNPX-2.5 (JEFF-3.1.1, CE)8: CRISTAL V1.0 (JEF 2.2, 172 EGs)9: MORET 5 (JEFF-3.1)10: SCALE 6 (ENDF/B-VII.0, 238 EGs)11: SCALE 6 (ENDF/B-VII.0, 238 EGs)12: SCALE 6 (ENDF/B-VII.0, CE)13: MCNP5 V1.40 (ENDF/B-VI, CE)14: MCNP5 (ENDF/B-VI.2, CE)15: MCNP5 (ENDF/B-VI.2, CE)
keff-max – keff-min = 0.00749
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009
54
Comparison of keff Values for Discharge Actinide and FP Fuel Composition
Discharge Actinide and Fission Product Fuel Composition
0.856
0.857
0.858
0.859
0.86
0.861
0.862
0.863
0.864
0.865
0.866
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Criticality Calculation No.
keff
1: SCALE 5.1 (ENDF/B-V, 44EGs)2: SCALE 6 (ENDF/B-VII.0, CE)3: MCNP-4C2 (JENDL3.3)4: SCALE6 (ENDF/B-VII.0, CE)5: MCNPX-2.5 (JEFF-3.1.1, CE)6: MCNPX-2.4.0 (ENDF/B-VI, CE)7: MCNPX-2.5 (JEFF-3.1.1, CE)8: CRISTAL V1.0 (JEF 2.2, 172 EGs)9: MORET 5 (JEFF-3.1)10: SCALE 6 (ENDF/B-VII.0, 238 EGs)11: SCALE 6 (ENDF/B-VII.0, 238 EGs)12: SCALE 6 (ENDF/B-VII.0, CE)13: MCNP5 V1.40 (ENDF/B-VI, CE)14: MCNP5 (ENDF/B-VI.2, CE)15: MCNP5 (ENDF/B-VI.2, CE)
keff-max – keff-min = 0.00714
International Workshop on Advances in Applications of Burnup Credit for Spent Fuel Storage, Transport, Reprocessing and Disposition, Cordoba, Spain, Oct 27-30, 2009