The selfconsistent Hartree--Fock--Bogolubov (HFB) calculation with the Gogny force D1S was performed for the spherical nuclei: isotopes of Ca, Sr, Sn, Sm, Pb, Th, isotones with magic neutron numbers 50, 82, 126 and \beta -stable nuclei. The shell effects were extracted by Strutinsky procedure from Hartree--Fock energy and obtained in this way macroscopic part of potential energy was approximated by the liquid drop formula of Myers--Swištecki type. The nuclear radii were calculated by HFB method with the Gogny D1S force for the same group of nuclei. They were approximated by the isospin dependent 3 parameter formula, which reproduced the experimental data very well, what is shown.

PACS numbers: 21.10.--k, 21.10.Dr, 21.10.Pc, 21.30.Fe