Checking, processing and verification of nuclear data covariances

Cabellos, Ó.; Dyrda, J.; Soppera, N.

doi:10.1051/epjn/2018028

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…3. The covariances were converted with NJOY into the BOXER format, a format recognised by the well-known NEA visualization tool JANIS and by sensitivity codes such as NDaST [419].…”

Section: Processing Covariance Datamentioning

confidence: 99%

“…Finally, it was found that the group structure of covariance data is also important, as can be seen from the results of the intermediate spectrum benchmarks, where a coarse group structure used to represent the covariance data of 239 Pu in the JEFF-3.3 library leads to higher uncertainty estimates. Table 52 gives the average uncertainty contributions in pcm in k eff calculated with the NDaST [419,424] tool for 4519 cases from the ICSBEP Handbook [23] with the precalculated sensitivities available in DICE [425]. Results are averaged by fissile material and spectrum and compared with the average experimental uncertainty.…”

Section: Criticalitymentioning

confidence: 99%

“…It should be quite clear that reduced uncertainties from an adjustment to benchmarks will only lead to reliable a posteriori covariances if these discrepancies are removed by the adjustment process and consistency with the much larger database of microscopic experimental nuclear data is maintained. In cases where such a satisfactory outcome is not achieved dedicated work should address these discrepancies and NDaST is a valuable tool for identifying issues by nuclide or by benchmark [419,424]. The program sketched above is a major challenge for the next generation of nuclear data evaluations.…”

Section: Summary Of K Eff Uncertainty Predictionmentioning

confidence: 99%

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The joint evaluated fission and fusion nuclear data library, JEFF-3.3

et al. 2020

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The joint evaluated fission and fusion nuclear data library 3.3 is described. New evaluations for neutroninduced interactions with the major actinides 235 U, 238 U and 239 Pu, on 241 Am and 23 Na, 59 Ni, Cr, Cu, Zr, Cd, Hf, W, Au, Pb and Bi are presented. It includes new fission yields, prompt fission neutron spectra and average number of neutrons per fission. In addition, new data for radioactive decay, thermal neutron scattering, gamma-ray emission, neutron activation, delayed neutrons and displacement damage are presented. JEFF-3.3 was complemented by files from the TENDL project. The libraries for photon, proton, deuteron, triton, helion and alpha-particle induced reactions are from TENDL-2017. The demands for uncertainty quantification in modeling led to many new covariance data for the evaluations. A comparison between results from model calculations using the JEFF-3.3 library and those from benchmark experiments for criticality, delayed neutron yields, shielding and decay heat, reveals that JEFF-3.3 performes very well for a wide range of nuclear technology applications, in particular nuclear energy.

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“…3. The covariances were converted with NJOY into the BOXER format, a format recognised by the well-known NEA visualization tool JANIS and by sensitivity codes such as NDaST [419].…”

Section: Processing Covariance Datamentioning

confidence: 99%

Section: Criticalitymentioning

confidence: 99%

Section: Summary Of K Eff Uncertainty Predictionmentioning

confidence: 99%

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The joint evaluated fission and fusion nuclear data library, JEFF-3.3

et al. 2020

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“…7). This agreement can be observed for the rest of relevant isotopes/reactions but a more extensive analysis would be worthwhile following the methodology proposed in [13]. This would allow to test in a more comprehensive way.…”

Section: Processing and Testing Coverx Jeff-33 Covariancesmentioning

confidence: 56%

Processing of JEFF nuclear data libraries for the SCALE Code System and testing with criticality benchmark experiments

et al. 2023

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In the last years, a new version of the Joint Evaluated Fission and Fusion File (JEFF) data library, namely JEFF-3.3, has been released with relevant updates in the neutron reaction, thermal neutron scattering and covariance sub-libraries. In the frame of the EU H2020 SANDA project, severale efforts have been made to enable the use of JEFF nuclear data libraries with the extensively tested and verified SCALE Code System. With this purpose, AMPX processing code has been applied to enable such application, allowing to provide insight into the interaction between the code and the new versions of JEFF data file. This paper provides an overview about the processing of JEFF-3.3 nuclear data library with AMPX for its application within the SCALE package. The AMPX-formatted cross-section library has been widely verified and tested using a comprehensive set of criticality benchmarks from ICSBEP, by comparing both with results provided by other processing and neutron transport codes and experimental. Processing of JEFF-3.3 covariances is also addressed along with their corresponding verification using covariances processed with NJOY. This work paves the way towards a successful future interaction between JEFF libraries and SCALE.

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McCARD Criticality Benchmark Analyses with Various Evaluated Nuclear Data Libraries

et al. 2022

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International Criticality Safety Benchmark Evaluation Project (ICSBEP) criticality analyses were conducted using the McCARD Monte Carlo code for 85 selected benchmark problems with 7 evaluated nuclear data libraries (ENDLs): ENDF/B-VII.1, ENDF/B-VIII.0, JENDL-4.0, JENDL-5.0, JEFF-3.3, TENDL-2021, and CENDL-3.2. Regarding the analyses, it was confirmed that the keff results are sensitive to the ENDL. It is noted that the new-version ENDLs show better performance in the fast benchmark cases, while on the other hand, there are no significant differences in keff among the different ENDLs in the thermal benchmark cases. The sensitivity of the keff results depending on the ENDL may impact nuclear core design parameters such as the shutdown margin, critical boron concentration, and power defects. This study and keff results will be a good reference in the development of new types of nuclear cores or new design codes.

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Checking, processing and verification of nuclear data covariances

Cited by 3 publications

References 9 publications

The joint evaluated fission and fusion nuclear data library, JEFF-3.3

The joint evaluated fission and fusion nuclear data library, JEFF-3.3

Processing of JEFF nuclear data libraries for the SCALE Code System and testing with criticality benchmark experiments

McCARD Criticality Benchmark Analyses with Various Evaluated Nuclear Data Libraries

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