We report the first ab initio calculation of the nuclear-structure-dependent radiative correction δNS to the 10C10B superallowed transition, computed with the no-core shell model and chiral effective field theory. We obtain δNS=0.422(29)nuc(12)n,el with a 1.6-times reduction in the total uncertainty when compared to the current literature estimate based on the shell model and Fermi gas picture. This Letter paves the way for a precise determination of Vud from superallowed beta decays within a systematically improvable framework.

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