New scheme of a nuclear fusion reactor system is proposed, the basic concept of which comes from ingenious combination of hitherto developed techniques and verified facts; 1) so‐called cold fusion (CF), 2) plasma of both magnetic confinement fusion (MCF) and inertial confinement fusion (ICF), and 3) accelerator‐based D‐T (D) neutron source. Through the comparison of the characteristics among ICF, LCF, and MCF, the feasibility of the LCFs is discussed. ©1996 American Institute of Physics.