Abstract
The CEGB requirement for alarm analysis is detailed, and different methods used are reviewed. The method used at Wylfa is described, covering the different display and printing facilities available from the computer system. Both the alarm and data facilities are described. A brief account of the computer equipment is given, and the methods of alarm detection are described. The organisation of the computer program is described, with tables of the fast-store and drum-store use. The system is now operational for station-plant commissioning, prior to delivery of power scheduled for 1969.

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