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

Journal Article · Wed Mar 29 00:00:00 EDT 2023 · EPJ Web of Conferences (Online)

DOI:https://doi.org/10.1051/epjconf/202328100007· OSTI ID:1972116

Neudecker, Denise  ^[1]; Grosskopf, Michael John  ^[1]; Alwin, Jennifer Louise  ^[1]; Cutler, Theresa Elizabeth  ^[1]; Frankle, Stephanie Cate ^[1]; Gibson, N. ^[1]; Haeck, Wim  ^[1]; Herman, Michal W.  ^[1]; Hutchinson, Jesson D.  ^[1]; Kleedtke, Noah Andrew  ^[1]; Michaud, Isaac James  ^[1]; Rising, Michael Evan  ^[1]; Smith, Travis Austin  ^[1]; Thompson, Nicholas William  ^[1]; Vander Wiel, Scott Alan  ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: 89233218CNA000001
• OSTI ID: 1972116
• Report Number(s): LA-UR-22-31309; TRN: US2313762
• Journal Information: EPJ Web of Conferences (Online), Vol. 281; Conference: 5. International Workshop on Nuclear Data Covariances, Held Virtually , 26-30 Sep 2022; ISSN 2100-014X
• Publisher: EDP Sciences
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EUCLID
nuclear data adjustment
ENDF/B-VIII.0