Which nuclear data can be validated with LLNL pulsed-sphere experiments?

Neudecker, Denise; Cabellos, Ó.; Clark, Alexander Rich; Haeck, Wim; Capote, R.; Trkov, A.; White, Morgan Curtis; Rising, Michael Evan

doi:10.1016/j.anucene.2021.108345

Cited by 13 publications

(6 citation statements)

References 31 publications

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“…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%

“…Sensitivities for k eff were calculated with the "ksen" card in MCNP ® Code Version 6.2 1 [25]. Sensitivities for LLNL pulsed-sphere neutron-leakage spectra were also calculated with MCNP but with a brute-force methodology [6,8], while "ksen" sensitivities were used to back out sensitivities for ∆ρ [6,11]. Reaction rate sensitivities were computed via SENSMG [26].…”

Section: Sensitivities Of Integral Responses To Nuclear Datamentioning

confidence: 99%

“…Therefore, mistakes in one nuclear-data observable can offset mistakes in other observables. Some integral responses beyond k eff were, however, shown [6][7][8][9][10][11][12] to have different sensitivities to the same nuclear data compared to those of k eff . Given the different usage of nuclear data to simulate various responses, there is a smaller nuclear-data phase space where errors in one observable can compensate for others, while still predicting the experimental values of all responses within their uncertainties.…”

Section: Introductionmentioning

confidence: 99%

“…The EUCLID (Experiments Underpinned by Computational Learning for Improvements in Nuclear Data) LDRD-DR (Laboratory Directed Research & Development-Directed Research) project [13] explored how nuclear data is used when simulating nine different integral responses, measured from LLNL pulsed spheres, critical or sub-critical assemblies, by calculating sensitivity profiles of these responses to nuclear data [6][7][8][9][10][11][12]. At the same time, ENDF/B-VIII.0 mean values and covariances [14] were processed.…”

Section: Introductionmentioning

confidence: 99%

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

Neudecker

Grosskopf²,

Alwin³

et al. 2023

EPJ Web Conf.

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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

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Section: Integral Responsesmentioning

confidence: 98%

Section: Sensitivities Of Integral Responses To Nuclear Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

show abstract

“…A different trend and differences up to 1% are also observed for the JEFF3.3 evaluation. As a comparison, it should be kept in mind that a change in ν p by 0.1% in an energy range as small as 100 keV can modify the computed criticality by about 100 pcm, which is about one third of the range between a controlled and an uncontrolled Pu critical assembly [30,31].…”

mentioning

confidence: 99%

Energy dependence of prompt fissions neutron multiplicity in the 239Pu(n,f) reaction

et al. 2022

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Editorial. Special Section on “A tribute to Massimo Salvatores, a great scientist and a great man”; Edited by: Giuseppe Palmiotti, Mario Carta, Stefano Monti, Temitope Taiwo, Toshikazu Takeda

Ravetto

2022

Annals of Nuclear Energy

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Which nuclear data can be validated with LLNL pulsed-sphere experiments?

Cited by 13 publications

References 31 publications

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

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

Energy dependence of prompt fissions neutron multiplicity in the 239Pu(n,f) reaction

Editorial. Special Section on “A tribute to Massimo Salvatores, a great scientist and a great man”; Edited by: Giuseppe Palmiotti, Mario Carta, Stefano Monti, Temitope Taiwo, Toshikazu Takeda

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