OECD/NEA intercomparison of deterministic and monte carlo cross-section sensitivity codes using sneak-7 benchmarks

International audience; A sensitivity benchmark exercise was organized within the scope of the Uncertainty Analysisin Modeling (UAM) project of the OECD/Nuclear Energy Agency (NEA) to develop andcompare methods for the sensitivity and uncertainty computations of the effectivemultiplication factor (keff) and the effective delayed neutron fraction (eff). Several solutionswere received using different codes, both deterministic (SUSD3D, SNATCH) and MonteCarlo (TSUNAMI-3D, XSUSA, SERPENT2, MCNP6). In this paper the performances ofseveral codes and methods for the keff sensitivity and uncertainty computations are intercompared. The sensitivity and uncertainty codes were applied to the SNEAK-7A and -7B fastneutron benchmark experiments from the IRPhE database. Good general agreementbetween the sensitivities, both for integral values and sensitivity profiles, was observed.