Electrical installation at Calder Hall nuclear power station

The paper describes the essential features of the installation with particular regard to the security of the supplies to the reactors. Main connections to the Grid system and the method of electrical control are included. Details are given of the electrical equipment required for the normal operation of the reactors and also for emergency operation, should the main supply fail. The method of change-over from normal to emergency running is explained in some detail, since it affects the safety of the reactor and must be reliable. The paper also briefly outlines the way in which some of the special problems were approached and indicates the reasons for the particular solution employed.