It is shown that the formation of a Bose-condensate of delocalized deuterons in solid solutions of metals and deuterium leads to the possibility of a d-d-fusion reaction in which one superfluid deuteron and one deuteron that does not participate in superfluid motion participate. Overcoming the Coulomb barrier is due to the large kinetic energy of macroscopic superfluid motion. It is shown that the intensity of the nuclear reaction depends on the velocity of the superfluid motion and, as a consequence, on the magnitude of the vector of the external magnetic field. In the London Electrodynamics approximation, a linear dependence of the power released during the nuclear reaction on the magnitude of the vector of the external magnetic field is obtained.