EDF Energy Somerset Chamber of Commerce SWMAS Business West

HPC News Update

September 29, 2018

Balfour Beatty breaks new ground

Balfour Beatty working on the HCT shaft, at the bottom of which the tunnel boring machine, for the outfall tunnel, will be launched

Balfour Beatty has marked a significant milestone with its first tunnelling excavation at HPC.

Excavation work began on the 40m-deep HCT shaft that will eventually connect the cooling water outfall galleries with the outfall tunnel taking water back out to sea.

The 17.5m internal diameter shaft will be excavated 1m at a time, with the first 13m lined with precast concrete segments. The remaining 27m will be constructed using a sprayed concrete lining (SCL) technique, applying concrete onto the exposed surface to provide a strong and permanent lining. Once the base is reinforced, the tunnel boring machines will start excavating the outfall tunnel.

10 members of Balfour Beatty were joined by EDF energy representatives on a recent visit to a specialist SCL training centre in Switzerland. The group saw demonstrations with new equipment, chemicals and techniques, some of which will be used on the Project.

Building blocks for the future

Although most of HPC’s welfare buildings and offices are now up and running, there is no slowing down, as attentions turn to the Site’s next major buildings.

Bouygues UK will be completing work on several projects, including two major buildings – the Simulator building and the Framatome warehouse, for one of HPC’s tier one contractors.

The Simulator building is a vital part of Site infrastructure, giving HPC’s operators a dedicated training centre, so they are at the top of their game when the power station is commissioned in 2025.

Vital storage

The Framatome building, west of North Office, will be vital for storing reactor parts at Site. Framatome is responsible for the production and delivery of the nuclear steam supply systems, as well as the stations operational and safety instrumentation, and control system.

Laurence Kendall, Project Manager, said: “We’ve got a big job ahead of us – several buildings must go up so other work can start. We’ve been preparing for months and facilities will start going up quickly. “

Progress at the Heat Sink

Bylor has already constructed four tower crane bases, using approximately 1,300m³ of concrete and 150 tons of reinforcement, installed three tower cranes and started construction of the concrete pumping station.

Further plans for the Heat Sink and remaining goals for 2018:

  • The erection of two additional tower cranes. The first Pump House raft pour (760 m³) by the end of September.
  • Construction of half of the Pump House raft slab by the end of December.
  • Subcontractor Bonna starts specialist steel cylinder concrete pipework.
  • Setting up the main compound on the platform, including the concrete pumping station.
  • Installing hoists and stairs for access to the Pump House excavation.
  • All of this will result in the workforce increasing to around 150 people.

Final Park and Ride is opened

HPC’s final Park and Ride opened at the end of August near Williton in West Somerset.

Washford Cross will provide 160 parking spaces for team members travelling from the area. Being the smallest of the Park and Rides means the Associated Development teams been able to carry out a pilot of sustainable lighting, with solar panels powering the lighting around the car park.

John Bower, Freight Services Manager, said:

“We are really pleased to get this final facility open ahead of time. The team has worked hard to get everything in place. This has helped us to safely bring buses in and out of the facility, while also benefiting the local community.”


Extracts from The Point September 2018

EDF Energy Heart of SW West of England LEP North Somerset Welsh Government