2019 **Abstract:** SENSMG is a tool for computing first-order sensitivities of neutron reaction rates, reaction-rate ratios, leakage, keff, α, and subcritical multiplication using the PARTISN multigroup discrete-ordinates code. 1 SENSMG computes sensitivities to all of the transport cross sections and data (total, fission, a nu, chi, and all scattering moments), four edit cross sections (absorption, capture, elastic scattering, and inelastic scattering), and the density for every isotope and energy group. It also computes sensit…

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“…15 Second-and higher-order uncertainty quantification is possible 15 and in fact desirable, because second-order contributions may be larger than one suspects. 16 For deterministic multigroup neutron problems, SENSMG can compute first-order 5,6 and secondorder sensitivities of a neutron response (but not keff) in a one-dimensional sphere or a two-dimensional cylinder (but not a stand-off point response) with respect to a cross section. [16][17][18][19] Cross sections for deterministic gamma-ray calculations are not generally appropriate for INRAD, so PARTISN and SENSMG would not generally be applied.…”

confidence: 99%

“…3 SENSMG can compute first-order sensitivities of keff with respect to a cross section in a one-dimensional sphere or a two-dimensional cylinder. 5,6 MCNP6 has a feature that would be very useful to determine the effect of changing cross-section libraries on keff, the KPERT card, but it has a bug that prevents its use. 23 SENSMG outputs the sensitivity of any response to each nuclide's Legendre scattering moment, 6 so it is easy to determine the relative importance of the scattering moments.…”

confidence: 99%