Our expertise


Designing innovative solutions and demanding excellence to achieve them

As a company specialising in the assembly, design, construction and integration of the highest-quality equipment and installations within the nuclear and industrial sectors for over 30 years, CSTI Groupe offers all its expertise to serve clients with the highest of standards.

For all requests concerning special machines, sheet metalwork, piping or test loops, CSTI Groupe guarantees personalised support throughout the duration of the project: from study to on-site installation, including manufacturing, assembly and testing.


  • Support via a dedicated contact person throughout the project
  • Consideration and respect of budgets and deadlines with regard to client expectations and/or the facilities
  • Discussion and approval throughout all phases of the project


  • Quality control at all stages of the design and manufacturing process
  • Management of cross-industry agreements
  • Implementation of a high level of quality, established according to specifications, current procedures and the applicable standards and expectations
  • Compliance with regulatory requirements and standards (RCC-M, RCC-MX, RCC-MR, ASME, CODAP, CODET, FEM, CM66 and snow, wind and seismic zone regulations)
  • Safety and risk analyses: first aid and occupational health, fire extinguisher handling, and the control of handling equipment and devices
  • Continuous improvement processes with regard to environmental policy within our organisation


  • Drafting of general or technical specifications
  • Value assessment and organic and functional analyses
  • Technical and mechanical expertise
  • Complete summary and detailed preliminary-design studies for equipment and, if necessary, their environment
  • 3D modelling
  • Support with project management and supervision, as well as technical assistance
  • Design, production and construction studies on CATIA V5, AUTOCAD, SOLIDWORKS, Creo and Inventor software
  • 3D animation on 3Dvia Composer, LUMION and 3DSMax software


  • Creation of design calculation or justification reports (structure, resistance, earthquakes)
  • Use of ANSYS and LS DYNA software for mechanics and composite or plastic materials
  • Static and dynamic calculation, both explicit and implicit
  • Various calculations: mechanical, hydraulic, thermal, thermo-hydraulic parts or metal structures


  • Design of turnkey software-assisted solutions: SEE Electrical Expert for drawings, CANECO BT, ELECCALC, Unity Pro from Schneider Electric PLC Software, VIJEO Designer, LABVIEW, PASCAL (PILZ) and SISTEMA
  • Automated design of low-voltage electrical installations
  • Calculation and mapping of installations to facilitate monitoring
  • Wiring, PLC programming and development of supervision tools


  • Link between the research office and the workshop to optimise production of equipment in accordance with client requirements
  • Monitoring of project progress in real time
  • Monitoring costs and deadlines


  • Drafting technical specifications for purchases
  • Respect of deadlines, budgets and requirements
  • Rigorous selection of suppliers
  • Guaranteed quality of supplies (CCPU product inspection and conformity certificate)
  • Optimisation of logistics deadlines
  • Monitoring suppliers


  • Perfect knowledge of advanced techniques for manufacturing: cutting, shaping, welding, machining and assembly
  • Welding
  • Solid expertise in mechanically-welded assembly processes and piping
  • Mastery of welding techniques (IWT) under RCC-M and RCC-MX standards for grades of stainless steel or aluminium.
  • Welding procedure qualifications and monitoring of these qualifications (NF EN, ASME, RCC-M)
  • Machining
  • Precision machining and production at 1/100 mm
  • Complex drilling, turning and milling processes
  • Electricity, control and command
  • Wiring, PLC programming and development of supervision tools


  • Functional, dimensional, radiographic and regulatory tests and qualifications
  • COFREND level II penetrant testing
  • Surface treatment


Assembly procedure

  • Assembly and on-site servicing
  • Installation, control and verification of scaffolding, including mobile scaffolding, and work at height
  • Installation of HILTI anchors and studs
  • On-site inspection assignments with staff in possession of the necessary skills, accreditation, knowledge and qualifications (radiation, CACES [safe driving certificate], CEFRI [radiological protection certification], low and high-voltage electrical accreditation, French M mechanical accreditation, work in ISO 7 cleanroom, special clothing and the wearing of PPE)
  • Radiation protection


  • User training programmes
  • Operational staff training programmes
  • Creation of maintenance manuals, also available on mobile devices, thanks to 3D modelling
  • Definition of on-site maintenance (routine or preventive)


  • Use of the FARO tracking laser, a portable 3D measuring instrument which optimises productivity management for long-range metrology applications such as reverse engineering, and the alignment, inspection and installation of assemblies, parts and machines.
  • Use of the FARO measuring arm, a portable 3D measuring machine which allows for the quality of manufacturing to be verified through 3D inspections, tool certifications, CAD comparisons, dimensional analyses, and the reverse engineering of components, etc.