Engineered Safety Features System by Solid State

One of the protection systems in the nuclear power plant is the engineered safety features system. The design of an engineered safety features system, utilizing solid state circuitry, is presented in the following. The solid state engineered safety features system provides a flexible, accurate, compact and reliable system. This is accomplished by selecting components with low failure rate, dividing actuation channels into multiple subchannels, including the diesel generator load sequencing and bus load shedding, and incorporating unique built-in test features. The solid state design facilitates periodic testing while the reactor is in operation. This paper describes these features and their correlation to published standards and guides for protection systems.