17 August, 2022

Enerpac SPMT for Sizewell B spent nuclear fuel dry storage

16 February, 2018

Heavy lift systems specialist, Enerpac Heavy Lifting Technology has supplied Holtec International, a diversified energy technology company, with a self-propelled modular transporter (SPMT). The SPMT600 hauling transporter is used to move spent nuclear fuel to EDF Energy’s new state-of-the-art dry store at the Sizewell B nuclear facility in the UK.

Spent nuclear fuel is sealed in Holtec-supplied double wall, multi-purpose canisters (MPCs) and placed within HI-STORM casks, overpacks which contain MPCs and are licensed world-wide. Holtec double wall MPCs stored within Hi-STORM overpacks provide multiple barriers against threats and accidents of all kinds and represent the state-of-the-art in the industry for long-term interim spent fuel storage. The Sizewell B dry fuel store will enable safe, onsite storage of a lifetime’s spent fuel. With this facility, the power station can continue to generate electricity until at least 2035, and potentially for a further 20 years beyond that, subject to life extension.

The Enerpac SPMT600 hauling transporter transfers the casks from the generating facility to the dry store. Its slim design and low height is ideal for operating in confined spaces. The SPMT provides 360-degree steering, as well as steer in crab mode. The steering angle of all wheel sets can be adjusted precisely, allowing the hauling transporter to make any desired movement.

Two hydraulic power packs and five trailers

The Holtec cask hauler comprises two hydraulic power packs and five trailers – and, for safety reasons, is limited to a maximum speed of 0.8 m/s. Wheel propulsion is by hydraulic drive motors; all wheels have individual drive motors, providing maximum traction. With three-axles per trailer, steering is by slewing drive, providing maximum reliability and accuracy.

The flexibility of the SPMT600’s modular configuration allows the end-user to use the hauling transporter for a range of tasks at Sizewell B. In total, one trailer can support 60 mtons (67 tons) load. The SPMT is controlled using the wireless Intelli-Drive Remote Controller, allowing one person to operate the transporter remotely, safely away from the load. The versatile SPMT is also designed and used to transfer the massive Sizewell B cask lifting transporter.

“The Enerpac SPMT is an important addition to our transportation capability when handling HI-STORM casks, the site Lifting Transporter and other major and heavy ancillary pieces of equipment,” said Holtec VP, Thomas Marcille. “It is easy to use and performed flawlessly during the successful completion of the first spent fuel loading campaign for Sizewell B’s dry store.”


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