A detailed calculation using the general rate theory scheme has been done to model the effect of Ti addition on the swelling behaviour of 316 stainless steel. Results obtained are in good agreement with the reported behaviour of swelling under high voltage electron microscope (HVEM) irradiation conditions. Important features are the decrease in the influence of Ti on swelling above 0.05% Ti, increase in swelling with cold-work and decrease in the influence of Ti on suppressing swelling at high doses.