Modular concepts in reactor control instrumentation

The basic circuitry of ornl (Oak Ridge National Laboratory) reactor control instrumentation has been rearranged, and in some cases redesigned, so that more flexibility, reliability, and economy are achieved without sacrificing the safety performance of the original designs. Circuits are constructed on a uniform chassis (plug-in type) called a module and are interconnected in such a fashion that some of them can fail, or be removed from the system for checking, without causing system shutdown. In conjunction with an improved monitoring scheme, the equipment achieves the objectives.