A Monte-Carlo investigation of the high power fundamental minority (D)T ICRF heating in JET is undertaken. The effect of the minority ion concentration, the location of the resonance layer, the symmetry of the wave field spectrum, the background ion temperature and the a-particle absorption of the ICRF power on the fusion yield is assessed in a projected pellet injected reference discharge (ne(0) = 1020 m­3, Te(0) =12keV, Ti(0) = 10keV, Prf = 25MW, (PD + Pa)abs/Prf = 80%). Even with nD/ne ­ 30%, which is needed for high fusion yield, the finite orbit width and its related transport effects, such as the banana drift, and the RF induced diffusion and drift, are important and strongly reduce the attainable yield. However, as here the transferred power to background ions dominates over the power to electrons, the increased target triton temperature can significantly improve the yield, and achieving Q (= Pfus/Prf) = 1 in JET would appear to be feasible. The use of the asymmetric wave field spectrum improves the confinement of the resonating ions and is shown to substantially enhance the yield and the duration time of the peak yield value. This effect, if also applied to tritons, could delay the characteristic deterioration of the peaked density profiles during the pellet-enhanced-performance (PEP) modes. a-particle absorption of the RF power was found to be very small.