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Contractors World 2010 Volume 1 Issue 4
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[United Kingdom - Innovative Solutions to Overcome Challenges at Nuclear Facility . . .cont]
How to install massive prefabricated processing modules?
Caption: Climbing Shuttering System SKE 50 following the first successful climb
In past phases of the world’s oldest commercial nuclear power generation and reprocessing facility, there has been space available to prefabricate elements on site.
However, as the facility has grown over the years, there is now little space for localised prefabrication, and with Sellafield being in a remote, albeit beautiful location, accessible only by rural roads or rail, logistics are a constant challenge for contractors.
However, Sellafield is very close to the shoreline with the Irish Sea and with the agreement of the local authorities, it was decided to carry out a feasibility study into shipping prefabricated modules from Ellesmere Port (Liverpool) via barge the 140km for off-loading onto the beach adjacent to Sellafield.
In total, there will be 11 modules being delivered by sea of varying dimensions, the largest of which is 27m. high.
The new evaporator building will also have over 22km of pipe work joined by over 10,000 welds and 300 tonnes of high grade stainless steel.
As a result of successful trials, design work is underway on the project for construction of a 10m wide low-gradient ramp from the shoreline at Sellafield beach for a distance of approximately 80m.
The next stage is a 5,000 m³ cut through a spit of land east towards the River Ehen.
To cross this required the construction of a 34m long bridge able to withstand the heavy loads. The bridge is supported on four 38m long, 2m deep steel beams which required a 650 tonnes Demag crane to put in place. The 2km delivery route from the beach to the construction site passes over railway lines, minor roads and through the Sellafield Site infrastructure.
Caption: Illustration of module being raised by 'gantry'
Contractors World Magazines are published by VVV Limited
Publisher: Roger Lindley
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