The paper describes a Pluto/Charon orbiter utilizing a bi‐modal nuclear propulsion and power system based on the Particle Bed Reactor. The orbiter is sized for launch to Nuclear‐Safe orbit atop a Titan IV or equivalent launch veicle. The bi‐modal system provides thermal propulsion for Earth orbital departure and Pluto orbital capture, and 10 kWe of electric power for payload functions and for in‐system maneuvering with ion thrusters. Ion thrusters are used to perform inclination changes about Pluto, a transfer from low Pluto orbit to low Charon orbit, and inclination changes about charon. A nominal payload can be deliverd in as little as 15 years, 1000 kg in 17 years, and close to 2000 kg in 20 years. Scientific return is enormously aided by the availability of up to 10 kWe, due to greater data transfer rates and more/better instruments. The bi‐modal system can provide power at Pluto/Charon for 10 or more years, enabling an extremely robust, scientifically rewarding, and cost‐effective exploration mission. © 1995American Institute of Physics