Irradiation by neutrons and ions in A15 superconductors (Nb3Sn, V3Ga) exerts a stronger influence on the pinning behavior than in nonordered alloys (NbTi). In this work it is shown for deuteron irradiated Nb3/Sn wires prepared by the bronze process that the dose curve of the volume pinning forcePVcan be conveniently described by a sum of two terms, due to the grain boundary pinning and to the radiation pinning, respectively. After deduction of the contribution by the radiation‐induced pinning centers, good agreement is obtained between the measuredPVvalues and those calculated using the upper critical fieldBc2and the transition temperatureTcon the basis of the irradiation fluence. The use of a theoretical relationship betweenBc2andTcis supported by measured values. Application to multifilamentary superconductors with high current carrying capabilities simplifies the calculation ofPV, since the radiation induced volume pinning force can be neglected.