Nuclear engineering and services
Onet Technologies wins dismantling contract at Creys-Malville power plant
Onet Technologies, an expert in nuclear dismantling and waste management, has just been awarded, in a consortium with SIGEDI, a contract for the electromechanical dismantling of the installations in the 4 steam generator (SG) buildings at the Creys-Malville nuclear power plant in Isère. This ambitious project, entrusted by EDF, is scheduled to run until August 2029. It is part of the plant's "out-of-pile block" (DHBP) dismantling package, which formerly housed the Superphénix reactor, the world's largest reactor currently being dismantled.
Scope of the contract and tasks entrusted to Onet Technologies
The dismantling contract awarded to Onet Technologies will cover 16 months of studies, followed by 50 months of work, until August 2029. It therefore covers a firm period of 78 months, with a 2-year extension option.
Under this contract, Onet Technologies, as leader of the consortium, has joined forces with SIGEDI.
At the Creys-Malville plant, Onet Technologies and SIGEDI will be responsible for the electromechanical dismantling of the installations in the 4 SG buildings, in particular all the piping in the secondary sodium loops (SG part) and associated circuits.
This colossal project involves working at heights over a 50-meter elevation, as well as handling, cutting and waste management.
A team of 50 highly qualified people is mobilized to carry out this project, half of them experts from Onet Technologies, the other half from SIGEDI.
Validation of the design studies is the first milestone to be reached by the Onet Technologies and SIGEDI teams working on this project. Scheduled for May 2024, these design studies include the definition of the dismantling scenario, and the safety, security and fire risk management analysis.
The challenges of dismantling the Creys-Malville power plant
The major issues associated with this project are as follows:
- Keeping to schedule: As the worksite is on the critical path to dismantling the plant, keeping to the provisional schedule is a crucial issue.
- Safety: Worker safety will be a constant priority, with work at height, heavy handling and risks associated with the presence of sodium, asbestos, lead and silica.
- Keeping the premises clean: As the GV buildings are classified as conventional waste zones (ZDC), radiological cleanliness must be maintained throughout the worksite.
- Waste management : This site generates both conventional waste (CIW / SIW) and nuclear waste (TFA), requiring appropriate management.
Renewed confidence from EDF
This major contract renews EDF's confidence in Onet Technologies, following on from the previous contract awarded in early 2023 for dismantling the peripheral circuits of the Brennilis reactor.
By February 2023, Onet Technologies had already successfully completed the dismantling of the exchangers at Chinon A3, after ten years of work, further strengthening the close collaboration between Onet Technologies and EDF.
Thanks to EDF for its renewed confidence in Onet Technologies.
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Nuclear engineering and services
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