2-854-142 - Historic England Archive/Heritage Images

Two workers on the surface of the reactor dome at Sizewell 'B' Nuclear Power Station, on the day the primary containment for the reactor was 'topped out'. The primary containment building for the nuclear reactor was 'topped out' on 9th July 1992. Work then began on the construction of the secondary containment, leaving an air gap of 3m between the two concrete layers. The secondary containment was 'topped out' in October 1993, in a ceremony marking the completion of the structure.