Nuclear

Case Study

Nuclear

Dungeness B Power Station – Electro Chlorination Plant

  • CONTRACTOR: Imtech Engineering Services
  • PROJECT VALUE: £1.2m

Project Overview

Dungeness B Power Station Cooling Water system is supplemented with an Electro chlorination Plant (ECHL).Due to reliability issues with the previous Electro chlorination plant and concerns that it will not be able to be relied on until the end of station life it was decided, to address the ongoing issues, and replacement of the previous system was the appropriate strategy. Working with parent company EDF, Imtech secured the contract to commence works in February 2020.

Approach

EDF immediately set to work supported by a water treatment specialist approving a design and procuring the new equipment.As part of the Imtech scope which utilised our electrical, mechanical and civil skill set we delivered strip out works, led the removal of the redundant sodium hypo chloride tank (demolition works), constructed a new cell room extension and ensured a series of installations. Installations included; new pump and sea water strainer skids, sodium hypo chloride storage tank, generator cells (and all associated pipework), design manufacture and installation of new galvanised steel staircase and lifting beam.Finally a series of electrical installations where necessary to complete works ranging from instalment of new containment systems to power and lighting upgrades and replacement of an upgraded fire protection system.

Throughout all work a delivered safely in adherence to EDF and Imtech’s documented safety policies.

Result

With construction commencing June 2020 and completing January 2021 the EDF and Imtech team have worked closely together delivering a high quality transformation. As a large scale project there were challenges when working within the parameters of a Nuclear Power Station, while also contending with the effects of a worldwide pandemic. Collaborative and committed to the end result, Imtech and EDF were able to overcome such challenges and deliver on schedule. As the project now moves into the commissioning phase Imtech will continue to grow its site presence at Dungeness and look to support the station wherever possible.

Sizewell A – Water Main Diversion Project

  • CONTRACTOR: Imtech Engineering Services
  • PROJECT VALUE: £280k

Project Overview

With two new buildings being established at Size well C and as part of the scope of works within the relocated facilities programme, it had become necessary to reroute the existing water mains feed to Size well A Power Station. Working sub-contractor Essex & Suffolk Water, Imtech were engaged to complete site set up and enabling works, prior to completing excavations by mechanical means.

Approach

Working across both Size well A & B, it was essential to develop a central laydown area for both materials and equipment as well as suitable welfare facilities for the operatives involved with the project. The project also involved ground sampling and the use of a directional drilling rig to bore underground to allow insertion of the newly formed 225mm HDPE water pipe into locations exactly specified within construction drawings.Pipes were then subsequently pulled through the previously formed directional drilling boreholes.

Result

The installation was successfully completed and after rigorous testing procedures, we reinstated and civilised the surrounding areas as well as demo bilising all equipment sympathetically to the local environment. Being acutely aware of the environmental considerations of the project, studies were carried out to assess for endangered species in the local woodland, making necessary arrangements for safe relocation of habitats where needed.

Sizewell B – CNC Welfare Facility Development Project

  • CONTRACTOR: Imtech Engineering Services
  • PROJECT VALUE: £680k

Project Overview

Civil Nuclear Constabulary (CNC) based at Size well B Power Station had outgrown their existing facility which had fallen into a degraded state of repair.This required a refurbishment and reconfiguration of the ground floor to open up more space accommodating Covid-19 restrictions. Imtech were successfully awarded the contract for this multi-discipline project tasked with the electrical, mechanical, builder’s works and civil elements.

Approach

As the main contractor we led with a series of feasibility studies. A design was prepared by our client, EDF to use the existing building, housing supply chain staff to become the new welfare facility.

All works were completed safely and with strict adherence to building regulations and site procedures. This included full review of electrical supplies and installation of electrical systems, full installation of air conditioning throughout, supply and installation of new shower cubicles, toilets and kitchen facilities requiring plumbing as well as construction of walls, partitions, new ceiling and flooring.

Result

In a challenging environment working alongside EDF, Imtech have delivered a great welfare facility for the Size well CNC Team.Overcoming a few challenges, the most noticeable being noise due to the proximity of occupied working offices, we delivered an exemplary building refurbishment from electrical through to civil works. The customer can now benefit from upgraded welfare facilities for their staff as well as bringing together their workforce from across the supply chain in a centralised and spacious area.

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