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New phase in the fight against frazil ice at the Golfech nuclear power plant

March 14, 2023

with the fitting of the diffuser, an essential pipeline element. 

Power production units require a constant supply of water for the operation and cooling of circuits. To ensure an ongoing supply of sufficient quantities of water and maintain the safety of a plant, the formation of frazil ice is to be avoided at all costs.

To prevent this risk, the Rennes and Bordeaux Regional Divisions laid a hot water supply system in the vicinity of the pumping station grids and the sections requiring protection. The diffuser, located at the mouth of the network, is the pipe section via which the hot water will be discharged in to the natural waterway.

What is frazil ice?

Frazil ice is the spontaneous transformation, at certain temperatures, of water into a collection of ice crystals which can clog pre-filtration or filtration facilities and thus compromise the transport of the raw water essential to the safety of nuclear power plants.

To lay this part, mounted along a wall and partially immersed, the teams designed a metal support frame to offset the impossibility of using divers.

  • The structure was manufactured and trial-assembled prior to galvanising at the Nuclear Agency depot in Savenay (Rennes RD).
  • The kit was then transported to the Golfech plant
  • Disks were pre-mounted on the diaphragm walls of the duct
  • The part was assembled in a dedicated area about 500m from the mounting site
  • The diffuser was raised and stowed, held in place by the frame, on a semi-trailer
  • The part was transferred, in its mount position, along a towpath

This key phase of the Golfech frazil project was expertly executed by our 2 Regional Divisions, demonstrating once again the level of expertise and ingenuity SADE Group teams are capable of, especially when working in synergy.

The project in figures

  • 20m of 1,200mm-diameter cast-iron pipe
  • 25 tonnes for the diffuser and metal frame
  • 500 hours of engineering (design office, method and operation, etc.)
  • 1000 hours for trial assembly, on-site assembly and wall mounting

Key dates for this phase

Start of works: 13 April 2022

Duration: 1 year

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23-25 av. du Docteur Lannelongue
75014 Paris

  • IN BRIEF
    • Profile
    • Anchoring
    • Path
  • PROFESSIONS
    • Systems
    • Infrastructure
  • SERVICES & SOLUTIONS
    • Regional authorities
    • Industries
    • Major infrastructures
  • REFERENCES
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  • APPLICATIONS
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  • CONTACT

Legal notice Ι Anticorruption code of conduct Ι Occupational gender equality index Ι Personal Data Protection Policy Ι Suppliers relationship © 2021 All rights reserved

Fraud Warning

It has come to our attention that emails have been sent by individuals falsely claiming to be SADE employees. The objective of these emails is to place false orders using our company’s name. Read more…

In the emails detected to date, the fraudsters are writing from the addresses “[email protected]” or “[email protected]”. They use our logo and Paris 75014 address.

We wish to draw your attention to the fact that these email addresses do not correspond to SADE’s email address, which bears the domain name sade-cgth.fr.

We thus advise caution in your communication and request that you do not exchange documents or information with persons other than your usual contacts at SADE. If you are in any doubt, we advise you to speak to your usual contacts prior to the transmission of any document or information.

As fraudsters regularly change their operating mode, we also recommend you alert all your employees likely to have dealings in this area (purchasing, accounting or payroll, etc.).

SADE systematically lodges an official complaint in response to such acts. We would be grateful if you could notify us at the following address of any contact you may have had with individuals claiming to be employees of our company: [[email protected]]