Combination coding control rod position-indicating system

A new control rod position-indicating system for water reactors—the combination coding, control rod position-indicating system—is introduced in this paper. The sensor of the system consists of several grouped transformers and one coding bar which is composed of m lengths of magnetic core and q lengths of non-magnetic portion. As the control-rod is withdrawn, the magnetic cores of the coding bar pass the transformers and change their output which is related to the rod position. Furthermore, we describe the coding principle of the indicating system and its experiments. The conclusion shows that this system has many advantages, such as smart coding, simple structure and excellent reliability. Therefore, it is a good control rod position-indicating system for water reactors.