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The most recent parametrizations D1S, D1N and D1M of the Gogny energy densityfunctional are used to describe fission in the isotopes $^{232-280}$ U. Fissionpaths, collective masses and zero point quantum corrections, obtained withinthe constrained Hartree-Fock-Bogoliubov approximation, are used to compute thesystematics of the spontaneous fission half-lives $t_\mathrm{SF}$, the massesand charges of the fission fragments as well as their intrinsic shapes. TheGogny-D1M parametrization has been benchmarked against available experimentaldata on inner and second barrier heights, excitation energies of the fissionisomers and half-lives in a selected set of Pu, Cm, Cf, Fm, No, Rf, Sg, Hs andFl nuclei. It is concluded that D1M represents a reasonable starting point todescribe fission in heavy and superheavy nuclei. Special attention is also paidto understand the uncertainties in the predicted $t_\mathrm{SF}$ values arisingfrom the different building blocks entering the standard semi-classicalWentzel-Kramers-Brillouin formula. Although the uncertainties are large, thetrend with mass or neutron numbers are well reproduced and therefore the theorystill has predictive power. In this respect, it is also shown thatmodifications of a few per cent in the pairing strength can have a significantimpact on the collective masses leading to uncertainties in the $t_\mathrm{SF}$values of several orders of magnitude.

Microscopic description of fission in Uranium isotopes with the Gogny energy density functional