[en] Results of ignition and continuous fueling scenario calculations are presented that were obtained in the framework of an assessment performed for the Next European Torus based on International Tokamak Reactors (INTOR) parameters. The results obtained with pellet injection are compared with results corresponding to gas puffing. Pellet injection transports fresh fuel to the reaction zone on a time scale that is much shorter than the diffusion time characterizing the gas puffing method, thus making the method flexible and readily adaptable to different situations. In the case of ignition by pellet injection, it may become possible to have deep neutral beam penetration and maintain favorable heat deposition profiles up to the moment of density ramp-up, thus substantially relaxing beam output requirements. The importance of a proper match between beam characteristics and pellet parameters is shown. In the case of continuous fueling of an already ignited discharge, the alpha power production notably increases if repetitive pellet injection, instead of gas puffing, is applied. The advantages of pellet injection are substantial, even at moderate pellet velocities