Use of shielding integral benchmark archive and database for nucleardata validation

Kodeli, I.; Cabellos, Ó.; Leal, L.C.

doi:10.1051/epjconf/202023918001

Cited by 7 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, when one predicts C of these experiments, 239 Pu and 240 Pu nuclear data would be expected to co-vary together and compensating errors could hide between nuclear data of those two isotopes. This issue compounds when one simulates k eff of thermal solution assemblies, where nuclear data of 1 H, 16 O, 14 N, components of steel, and major actinide nuclear data are all used jointly. Hence, compensating errors could occur between nuclear data of those isotopes.…”

Section: Discussionmentioning

confidence: 99%

“…These experiments were not yet vetted to be benchmarks and questions remain about concrete surrounding the beamline and the modeling of the neutron source, etc. [13,14]. These experiments measure neutrons leaked from a sphere of material containing few or only one isotope that was pulsed by a 14-MeV D+T neutron source situated in the center of the sphere.…”

Section: Integral Experiments Inputmentioning

confidence: 99%

See 1 more Smart Citation

Uncovering Where Compensating Errors Could Hide in ENDF/B-VIII.0

et al. 2023

View full text Add to dashboard Cite

Unconstrained physics spaces between two or more nuclear data observables in a library occur when their values can be simultaneously adjusted without violating the uncertainties in either differential information or simulations of relevant integral experiments. Differential data are often too imprecise to fully bound all nuclear data observables of interest for application simulations. Integral data are simulated with combinations of nuclear data so that an error in one observable may be hidden by a counterbalancing error in another. In this manner compensating errors may lurk within nuclear data libraries and these errors have the potential to undermine the predictive power of neutron transport simulations, particularly in situations where there is no conclusive validation experiment that resembles the application of interest. The EUCLID project (Experiments Underpinned by Computational Learning for Improvements in Nuclear Data) developed a preliminary workflow to identify these unconstrained physics spaces by bringing together results from a large collection of integral experiments with their simulated counter-parts as well as differential information that have a one-to-one correspondence to nuclear data. This wealth of information is processed by machine learning tools for subsequent refinement by human experts. Here, we show how the EUCLID work-flow is executed by applying it first to 239Pu and then to 9Be nuclear data in ENDF/B-VIII.0.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Integral Experiments Inputmentioning

confidence: 99%

Uncovering Where Compensating Errors Could Hide in ENDF/B-VIII.0

et al. 2023

View full text Add to dashboard Cite

show abstract

“…These experiments extend the energy range of validation of around 5 MeV reached by k eff to 15 MeV. However, these experiments are suspected to be biased [8,20]; their uncertainties (0.5-2%) are not rigorously quantified.…”

Section: Integral Responsesmentioning

confidence: 98%

Understanding the impact of nuclear-data covariances on various integral responses using adjustment

Neudecker

Grosskopf²,

Alwin³

et al. 2023

EPJ Web Conf.

View full text Add to dashboard Cite

The EUCLID (Experiments Underpinned by Computational Learning for Improvements in Nuclear Data) project created a library of sensitivities for nine different integral responses with respect to nuclear data. These integral responses were obtained from measurements at LLNL (Lawrence Livermore National Laboratory) pulsed spheres, critical and sub-critical assemblies. At the same time, covariances for ENDF/B-VIII.0 were processed at LANL (Los Alamos National Laboratory). The combination of these data allow us to study the impact of nuclear-data covariances on various integral responses, either by forward-propagating covariances via sensitivities, or by using nuclear data, integral responses, and sensitivities for adjustment. Here, we will present: the impact of 1H, 9Be, 12C, 27Al, 56Fe, 235,238U, and 239,240Pu ENDF/B-VIII.0 covariances on simulated bounds of the following integral responses: LLNL pulsed-spheres neutron-leakage spectra, the effective neutron multiplication factor, reaction rates, and reactivity coefficients of ICSBEP critical assemblies. Also, adjustment results with the same nuclear-data covariances and responses will be discussed. LA-UR-22-31309

show abstract

“…• do not lose or remove any existing information from the database, • involve the nuclear data community, and • capture the output of the Working Party on International Nuclear Data Evaluation Cooperation (WPEC) Subgroup 47, which was focused on the use of SINBAD for nuclear data validation (Kodeli, et al, 2022).…”

Section: Shielding Integral Benchmark and Archive Database (Sinbad)mentioning

confidence: 99%

Engagement opportunities in OECD NEA benchmark development

Bess¹,

Blaise

Buß

et al. 2023

Front. Energy Res.

View full text Add to dashboard Cite

A myriad of opportunities is available to collaborate via international benchmark exercises and experimental data preservation activities. Many such opportunities abound under the auspices of the Nuclear Science Committee of the Organisation for Economic Co-operation and Development Nuclear Energy Agency (NEA). Key projects and activities of relevance to the development of advanced reactors design include the International Criticality Safety Benchmark Evaluation Project (ICSBEP), the International Reactor Physics Experiment Evaluation Project (IRPhEP), the International Assay Data of Spent Nuclear Fuel Database (SFCOMPO), the Shielding Integral Benchmark and Archive Database (SINBAD), and The International Experimental Thermal HYdraulicS Database (TIETHYS), and various cooperative benchmark exercises. Interested participants are encouraged to contact the leadership and secretariat of the various Technical Working Groups and Working Parties to become more engaged. This paper provides a summary of the current benchmark exercises and experimental databases available for international participation.

show abstract

Use of shielding integral benchmark archive and database for nucleardata validation

Cited by 7 publications

References 9 publications

Uncovering Where Compensating Errors Could Hide in ENDF/B-VIII.0

Uncovering Where Compensating Errors Could Hide in ENDF/B-VIII.0

Understanding the impact of nuclear-data covariances on various integral responses using adjustment

Engagement opportunities in OECD NEA benchmark development

Contact Info

Product

Resources

About