![]() ![]() New jobs will be created and up to 650 workers will be employed on site. The phased project is planned to begin in 2021 and Babcock estimates the peak construction time is likely to be between late 2022 and early 2025. Two obsolete support buildings, N125 and N093 on the west side of the dock will be demolished and replaced with a single building containing offices, production facilities and staff amenities. A new Water Retaining Boundary (WRB) will be built to protect the dock from tidal surges and possible future water level rise associated with climate change. The dock will be served by electrical, water and waste pipework accommodated in subway structures in the new walls. The 2.61-hectare dock will be considerably narrowed and shortened by the reinforcement of the East and West walls and construction of a new headwall (the white areas on the mockup). The new development at 10 Dock will have similarities with the 9 Dock upgrade project but does not have the cost of complexity of the RAH and PCD/ACRC as it is not intended to be used for nuclear refuelling or de-refuelling operations. CGI showing preliminary design proposal for the refurbishment of 10 Dock and the new support building to be constructed on the west side. The building’s equipment and plant is connected by over 20 km of pipework and 150 km of electrical cable in 92 rooms. The PCD/ACRC building contains the plant used to cool the reactor, apply chemical decontamination and inject or remove boronated water reactivity suppressant. At the head of the dock, a Primary Circuit Decontamination and Alternative Core Removal Cooling (PCD/ACRC) system building was constructed. Spent fuel can be raised up into the RAH and new fuel rods lowered into place. To enable nuclear refuelling, a new Reactor Access House (RAH) was built that moves on rails to be aligned over the reactor compartment. The dock entrance is sealed by very large multi-cellular caissons and seismically-qualified dockside cranes have been installed. The cope was secured by more than seventy, 760-millimetre diameter steel piles anchored in 12-metre sockets anchored in the rock. A new dockside edge structure (cope) with service subways to carry piping and cables was constructed on top of the counterforts. The old dock was considerably narrowed by lining with counterfort walls constructed on top of the new dock floor. The original dock floor was removed and a new floor with integral drainage system was constructed and fitted with a cradle to secure the submarine. Very robust structures are needed and systems such as cooling water and electrical power need to have multiple backups in the event of failure.īetween 19 the adjacent number 9 Dock was refurbished to conduct refits and refuelling of the Vanguard-class submarines. The requirement to withstand a severe earthquake (Considered likely to happen, just once in 10,000 years in Plymouth) is particularly demanding from an engineering perspective. Stringent modern regulations require that the nuclear facilities must have redundant systems and be able to withstand earthquakes, high tides and high winds. Number 10 Dock is the biggest dry dock at Devonport and Babcock Marine, who operate the yard, have plans for a complete refurbishment to create a second facility certified to take the largest nuclear submarines. Here we examine the context and reasons for the upgrade. Plans to convert another dry dock in Devonport to refit the Dreadnought class submarines were recently revealed in an outline planning application.
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