Mobile robot survival

Mobile robots designed for use in hazardous environments around nuclear reactors or nuclear power plants are subjected to a number of threats that may severely damage or result in the loss of an expensive robot. A number of threats are examined. Most of the threats can be counteracted by the use of proper sensors and appropriate computer-based artificial intelligence. The best defense is to detect the threat before damage has occurred and intervene by warning the operator or by blocking commands that would damage the robot. A microcomputer-based system that will monitor the stable margin of the robot, and intervene when necessary, is being developed. A second system under development will servo-control a tether microwave antenna to maintain satisfactory signal strength, or block control motion should the signal strength drop below a suitable level. Potential defenses against the other threats are being analyzed