Application of OH180 programmable controllers to safety related systems at the Darlington nuclear generating station

Darlington nuclear generating station, one or North America´s largest energy projects, is being built by Ontario Hydro. As with any major complex plant, many different forms of control are utilized, from major computer systems to local mechanical relays and many variations in including the OH180 programmable controller (PC). The author looks at some of these control methods but focuses on the OH180 PC. General and diagnostic features, software aspects, system arrangement and process system application of the OH180 are discussed. The use of this programmable controller for verification control and data issue/control as well as operating experience in a nuclear plant are also considered