nuclear data evaluation work at irsn · 2018-04-09 · luiz leal / irsn –tpr meeting -march 2018...
TRANSCRIPT
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Nuclear Data Evaluation
Work at IRSN
TPR MeetingOak Ridge National Laboratory
IRSN / PSN-EXP/SNCMarch 2018Luiz LEAL© IRSN
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2▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
OUTLINE
1.Gd evaluations
2.Evaluations Performed at IRSN: 233U, 54Fe
3.Concluding remarks
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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3▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Resonance Evaluations and deliverables
Isotope Energy Range
Resonance
Covariance
Evaluation
233U Thermal to 2.0 keV RP + CV
155Gd, 157Gd Thermal to 500 eV RP + CV
54Fe Thermal to 1.2 MeV RP + CV
Pb and MoAssessment of existing
evaluations-
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4▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
155Gd and 157Gd Resonance Evaluation
▌Motivation:
§Issues with benchmark calculations with Gd
concentration;
§Extension of the resonance region from 300 eV to
500 eV;
§SAMMY R-matrix analysis;
§Transmission, capture data from RPI;
§Improve benchmark integral representation;
§Uncertainty information and resonance
parameter;
§Covariance generation;
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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5▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
General Information
Atlas of Neutron Resonances (ANR)
Thermal
Cross Section
(barns)
Capture
Resonance
Integral
(barns)
Westcott’s
Factor
155Gd 60900 ± 500 1537 ± 100 0.83899
157Gd 254000 ± 815 754 ± 20 0.84715
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6▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Benchmark Results: Issues
▌ZED-II (Zero Energy Deuterium)
Research Reactor
▌Issues with benchmark
calculations with Gd
concentration
Note: Dan Roubtsov kindly
shared his MCNP input
decks
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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7▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Issue:
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8▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Keff Sensitivity to the Capture Cross Section
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9▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
SAMMY Fitting (RPI)
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10▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Resolution: use of SAMMY and SAMINT
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11▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
EvaluationThermal
Cross Section
(barns)
Capture
Resonance
Integral
(barns)
Westcott’s
Factor
ENDF/B-VIII.0 252892.2 759.26 0.85305
IRSN (RPI) 225629.8 778.32 0.76287
IRSN 244071.5 806.62 0.82467
ANR 254000 ±
815
754 ±20
0.84715
157Gd Results
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12▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Moving Forward:▌Include new capture cross-section measurements performed at n_TOF;
▌Include new thermal cross-section measurements (work underway in Hungary);
▌Verify contribution of other Gd isotopes, mainly 155Gd;
▌Include IRSN Gd benchmark in the integral fitting;
▌Covariance generation;
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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13▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
54Fe Evaluation in the Resolved Resonance
▌Natural Iron: 56Fe(91.75 %), 54Fe(5.85 %) and 57Fe(2.12 %);
▌Resonance region extended from 700 keV to 1.2 MeV;
▌High resolution transmission data of Cornelis (GELINA) and Harvey (ORELA);
▌Capture and DDX Scattering cross section needed;
▌First inelastic channel opens 1.434 MeV;
▌ Inelastic cross section data measurements going on at GELINA;
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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14▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
54Fe Resolved Resonance
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15▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
54Fe GEEL inelastic cross section
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16▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
233U Resonance Evaluation▌Motivation :
§Address issues with thermal and epithermal energy benchmark ;
§ Extend resonance energy from 600 eV to 2 keV;
§High resolution transmission and fission data taken;
§Very little information on capture data;
§ SAMMY R-matrix analysis;
§ Improve benchmark integral representation;
§Uncertainty information and resonance parameter
§ Covariance generation;
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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17▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
233U Resonance Measurements▌ 233U fission and transmission measurements done at ORNL
ØFission Measurement:§ 233U fission chamber (2.11 grams Uranium)§99.997% enriched 233U§Energy range from 0.4 eV to 700 keV
ØTransmission Measurement:§~35 and ~73 gram-metal samples§99.76 % 233U§Cryogenically cooled to T=11 K§Energy range from 0.5 eV to 600 keV
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
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18▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
External Levels
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19▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Data Fitting
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20▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Data Fitting
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21▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN
Concluding Remarks
▌ IRSN continues to work close to the NCSP agenda on differential
data evaluation;
▌Final evaluation includes resonance parameters and resonance
parameter covariance;
▌ Luiz LEAL / IRSN – TPR Meeting - March 2018 @IRSN