To ensure the safety and reliability of obsolete thermoelectric plants, the routine patrol in their facilities has been carried out by human workers. However, due to their poor working environments, a robot-patrol system has been gradually required in place of human workers from the point of view of worker safety and efficiency. For this purpose, this article presents a patrol robot, controllers and their control scheme. Especially, this robot system uses a line-drawing algorithm, which uses a vision camera instead of IR sensors, and an RFID system for its patrol operation. We confirm its effectiveness through experiments.