The Collaborative International Dictionary of English v.0.48:

nuclear power \nuclear power\ n.
   1. Power derived from nuclear reactions; -- used at present
      especially of electrical power generated in atomic
      reactors, but encompassing also fusion power.

   Syn: atomic energy, atomic power, nuclear energy, nuclear
        energy.
        [WordNet 1.5]

   2. A country possessing nuclear weapons.
      [PJC]

WordNet (r) 3.0 (2006):

nuclear power
    n 1: nuclear energy regarded as a source of electricity for the
         power grid (for civilian use) [syn: atomic power,
         nuclear power]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "nuclear power":
   AEC, Atomic Energy Commission, activation energy, atomic energy,
   atomic power, atomic project, atomic research, binding energy,
   electric power, electropower, energy level, horsepower,
   hydraulic power, hydroelectric power, impulse, jet power, manpower,
   mass energy, nuclear energy, piston power, propulsion,
   rocket power, solar power, steam power, thermonuclear power,
   thrust, water power