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The objective of this work is to design the configuration of thrusters and valves of a propulsion system which should reject external and internal perturbations to control position and attitude of a spacecraft. As has been proved in a previous paper by Pena et al. (see ibid., vol. 36, no. 3, 2000), there exist configurations of 6 thrusters which can achieve this task, even under the failure of any one of them. Nevertheless, that previous result only presents analysis conditions and furthermore its implementation would demand also 6 valves, one for each thruster. Here we propose a design method that can solve the aforementioned problem with 6 thrusters/3 valves.