Westinghouse Electric Company LLC

Thomas Pierce Hayes

Albert W Crew

William D Ghrist, Iii

Carl A Vitalbo

Glenn E Lang

A protection system for a complex process has four redundant protection sets, each of which produces partial reactor trip and partial safeguard actuation signals in pairs of microprocessor-based controllers. Two independent and redundant voting logic trains are provided for the partial reactor trip signals, and two identical, independent and redundant voting logic trains are provided for the partial safeguard actuation signals. Each of the trains includes a pair of redundant microprocessor-based voting logic controllers, each of which receives the partial reactor trip or partial safeguard actuation signals from each of the process protection sets and has a voting processor which generates an intermediate reactor trip or intermediate safeguard actuation signal in response to partial signals from a predetermined number of protection sets. The intermediate signals from the two voting logic controllers in each train are ANDed to generate train signals. The reactor trip train signals are then ORed to generate a reactor trip signal. Each of the train safeguard actuation signals activates a separate set of redundant components.

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McMurray, PA, United States of America

Thomas Pierce Hayes