Work has started on the third and final phase of the project to dismantle ex-HMS Swiftsure. As the demonstrator project for the dismantling programme, she will be the first former RN SSN to be fully disposed of.

The glacial project to safely scrap the growing fleet of decommissioned boats has finally begun to make some progress at Rosyth in the last few years. Each submarine will undergo a three-step process which involves Low Level Radioactive Waste (LLW) being removed first. The second and most demanding stage involves the removal of the Reactor Pressure Vessel that holds the reactor core and is classed as Intermediate Level Radioactive Waste (ILW).

The final stage is to ensure the submarine is completely free of radioactivity and radioactive material as well as removing any remaining elements that are classified. At this point, the submarine can be cut up and around 90% of the remaining material, mainly steel and other metals, can either be reused or undergo conventional recycling. Swiftsure appears to be slightly ahead of the initial schedule, having completed Phase 1 (December 2016 – August 2018) and now Phase 2.

Swiftsure’s disposal is a notable achievement as the first Pressurised Water Reactor (PWR) anywhere in the world to be dismantled. Other nations use a much simpler process and cut the entire reactor compartment out of the submarine and transport it structurally complete for burial in land storage facilities. The US has successfully disposed of over 130 nuclear ships and submarines since the 1980s. The Russians have disposed of over 190 Soviet-era boats (with some international assistance) since the 1990s while France has already disposed of 3 boats from their much smaller numbers.

Besides the progress with Swifsure, LLW has been safely removed from ex-HMS Resolution, Revenge and Repulse. As experience has been gained working on successive boats techniques have been refined and more waste has been managed to final disposal at reduced cost. The optimisation of the process allowed 50% greater tonnage of waste to be removed in 75% of the time it took for Swiftsure. So far the work has been completed safely on budget and on time. Work has yet to begin on ex-HMS Dreadnought, Churchill and Renown still afloat in the basin at Rosyth.

While there is positive progress at Rosyth, 14 Dock at Devonport is still not ready to accept the first boat to begin defuelling and dismantling. There are now 15 decommissioned submarines filling up the basins in Plymouth (soon to be 16 when HMS Triumph goes in 2025). Work to get rid of this legacy cannot start soon enough. At least the lessons learned in Rosyth should give the teams at Devonport an advantage although the majority of these boats still have their nuclear fuel on board and will have to undergo a 4-stage process.
 
Source: navylookout.com