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New ${\bar{\nu}_e},e$ scattering experiments aimed for sensitive searches ofthe ${\nu}_e$ magnetic moment and projects to explore small mixing angleoscillations at reactors call for a better understanding of the reactorantineutrino spectrum. Here we consider six components, which contribute to thetotal ${\bar{\nu}_e}$ spectrum generated in nuclear reactor. They are: betadecay of the fission fragments of $^{235}$U, $^{239}$Pu, $^{238}$U and$^{241}$Pu, decay of beta-emitters produced as a result of neutron capture in$^{238}$U and also due to neutron capture in accumulated fission fragmentswhich perturbs the spectrum. For antineutrino energies less than 3.5 MeV wetabulate evolution of ${\bar{\nu}_e}$ spectra corresponding to each of the fourfissile isotopes vs fuel irradiation time and their decay after the irradiationis stopped and also estimate relevant uncertainties. Small corrections to theILL spectra are considered.Comment: LaTex 8 pages, 2 ps figure

Components of antineutrino emission in nuclear reactor