A nitride-fueled nuclear reactor is proposed in which the fission products are selectively removed from the reactor in a liquid alloy, and makeup fuel added during operation. The concept is based on the behavior of the nitrogen-nitride equilibria in liquid fuel-tin alloy systems where an actinide nitride fuel in contact with liquid metal alloy will reversibly form or dissolve depending on the temperature, the nitrogen pressure on the system, and the fuel content of the alloy. Consequently, controlling the temperature and the nitrogen pressure over the solid nitride fuel-liquid alloy phases will result in a critical mass of nitride being maintained and the fission products that form being dissolved in the liquid alloy above it. The liquid alloy phase may be removed, the fission products eliminated, and the alloy recycled to the reactor with or without makeup fuel additions.