EDF Energy Somerset Chamber of Commerce SWMAS Business West

HPC News update

November 20, 2018


Milestone reached

The first Pump House raft pour has been completed with a total of 760m³ of concrete produced by Bylor’s Concrete team. The concrete was poured over the installed rebar for one section of the raft taking over 16 hours to complete, using a mobile boom and a ballasted placing boom.

The rebar placement and concrete pouring are part of the construction of the five rafts for HPC’s Pump House. Although it stands 54m tall, the pump House is buried 36m deep on three sides. It will contain cooling water systems and supporting systems, such as filtration and ventilation.


Boccard completes welding

The first piece of permanent plant has arrived on site in the form of several RPE sump tanks. As part of the works, Boccard is now completing the welding on the joining pipes between the sumps in Unit 1’s pre-stressing gallery. Bylor is now working on fitting the tanks in Unit 1’s Pre-Stressing Gallery. In addition, several more tanks are due to be delivered over the coming weeks. They will act as water drainage tanks and sit deep under the future reactor building to form an integral part of the water release system from the reactor’s circulation system.

The team are conducting radiography testing to check the integrity of the welds, which will show any defects in the welding, so latent errors aren’t discovered in the future.


Work begins on Unit 2 Heat Sink

Having completed work on the Unit 1 Heat Sink, Kier BAM have begun work on Unit 2 Heat Sink, where experience and the lessons learned from Unit 1 are helping to maintain their quality and safety performance.

Changes to the sequencing of works are already speeding up progress. Improvements have been made to the cold weather concreting procedure. This includes new rules that apply to specific temperature ranges –particularly important in the colder winter months.


Balfour Beatty to start work on 6 underwater heads

Last month, Balfour Beatty took delivery of materials to commence the ‘Smart Start’ of the huge underwater heads that will play a key role in providing HPC with cooling water. As part of its Marine and Tunnelling works, Balfour Beatty will build six heads that will cap tunnels feeding the nuclear reactors with seawater. All six heads will be constructed on purpose-built platforms in Avonmouth for loadout in 2020. The heads are critical to providing a flow of water to cool the reactors. They have been designed to be strong enough to withstand seismic events. Rebar, or reinforced steel rods, give the heads their strength. Due to their high specification, the rebar inside the heads is thought to be the most dense and geometrically complex reinforcement work ever undertaken by Balfour Beatty.

Alistair Geddes, Project Director, said: “The design work for these incredibly complex structures has been enormous. They’ve been modelled to make sure they can be built efficiently without any compromise to their strength. We’ve used industry-leading engineering to re-detail 85% of the heads, spending valuable time modelling every detail and planning the logistics for a successful build.”


Bouygues begins construction of buildings

The two-year build of the first permanent buildings has officially begun, with the arrival of Bouygues UK to Site. The team, which is taking possession of its areas of work from Kier BAM in phased handovers, will construct the Simulator Training Centre and the Framatome Warehouse. Foundations for both of the buildings are about to be laid and erection of the steel frame for the buildings is expected to take place in early 2019. Iain Brooks, Construction Area Delivery Manager, Ancillary Buildings, said: “The Site contains a lot of Blue Anchor rock, which has meant more remedial work was needed than first anticipated, but we’re delighted to have started work at HPC.”


Sedgemoor Campus opens its doors in December

The Sedgemoor Campus, containing 980 bedrooms will be opening in December, with reservations now being taken for bookings in January 2019. The campus is just a 10-minute walk from Bridgwater town centre and each of the soundproofed, en-suite bedrooms offers plenty of storage, an in-room safe, Freeview TV and free Wi-Fi. The on-campus restaurant offers freshly cooked meals prepared with local produce, and is open for breakfast, lunch and dinner. There is also a well-equipped gym and floodlit sports pitches, which can be booked by anyone working on Site.


Taken from The Point November 2018

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