Nant de Drance

Nant de Drance - Ventilation

Client / Owner

Nant de Drance SA (Alpiq 39% - CFF 36% - IWB 15% - FMV 10%)

Execution

2013 - 2018

Collaboration

Nunatak Architects for the services corresponding to the secondary works. 

Project description

The concerned infrastructure is the Nant de Drance 900 MW pumped storage power station located in Valais – Switzerland.

The project includes:

  • A main machine cavern (194m x 52m x 32m LHW) containing 6 Francis reversible groups (150 MW each).
  • Secondary caverns (transformers, valves).
  • 17 km of underground tunnels / galleries.
  • 8 electrical substations. 

Services

  • Determination of ventilation objectives as current regulations and different modes (comfort, fire , etc.)
  • Developing the operating principle diagrams of ventilation flow
  • Predimensioning ventilation equipment and optimization of electrical power
  • Quotation and quantitative estimation of equipment
  • Detailed definitions of modes / ventilation scenarios
  • Sizing fans / piece and ductwork
  • Design of ventilation facilities ( power plants, wells , etc.)
  • Plans, quantitative , etc.
  • Studying the formation of fog gallery
  • 3D fire simulation to verify / validate the sizing of the fire ventilation

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