The Repair of an Advanced Gas Cooled Reactor at Hunterston ‘B’ Power Station following an Ingress of Sea Water

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Abstract
A major repair of a 660 MWe advanced gas cooled reactor at Hunterston ‘B’ Power Station was undertaken after some 8000 litres of sea water had entered a space below the boiler region of the reactor gas circuit. The remedial activities comprised surveys to establish the condition of the reactor internals, removal of affected reactor vessel insulation, shot blasting of surfaces to remove salt and corrosion products, refurbishing of studs and other components and rebuilding of the insulation. Four hundred and eighty man-years of work were completed during the twenty-four months of the repair exercise, which required a peak site supervision and labour force of 340. The reactor was returned to power in February 1980 and has since operated successfully with no restriction arising from the incident.

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