Defence in depth

Based on the principle of « Defence in depth », nuclear safety relies on multiple levels of protection and lines of defence. To face the challenges of safety and performance, Seres Technologies builds its expertise around 3 fundamental notions: safety culture, sensitive activity and human reliability.

Safety: our core competence

Defence in depth : Military term destined to delay the enemy. It is about making use of several safety devices to reduce risk, whenever a protection component is jeopardised or failing.

Based on the principle of « Defence in depth », nuclear safety, our core competency, relies on multiple levels of protection and lines of defence, which are present from the designing of a facility. Such system reduces to an extremely low level the risk of accidents that could have serious consequences outside the facility.

Seres Technologies consultants and engineers identify current and upcoming risks by collecting bibliographical data, both on the ground and through feedback on each site. They assess the facility’s safety state and provide procedures, rules, recommendations, safety requirements and technical prescriptions to be implemented on the ground.

The Seres Technologies offer revolves around skills, expertise and crafts. We deal with the issues of our customers at all stages of the nuclear cycle, depending on the facility context and specific needs.


  • Our know-how

    GB-shema-defense-en-profondeur-surete-seres-technologiesThe Seres Technologies standard: a team of qualified experts

    To guarantee an increasingly reliable energy model, Seres Technologies selects highly qualified nuclear safety consultants and engineers (Masters Graduates at least) with experience in oil and nuclear industry and defence.

    The Seres Technologies standard also is a network of specialists in fields related to nuclear safety: thermal hydraulic engineers – dependability engineers – mechanical engineers – waste management and dismantling scheme engineers – industrial safety or hygiene security and environment (HSE) – process engineers – Ergonomics and OHF specialists and experts.

    Means and competences

    Our teams have technical and organisational means and high-performance softwares :

    • Technological and regulatory monitoring.
    • Guides and regulations.
    • Atmospheric and liquid radiological dispersal softwares.
    • Good knowledge of quality formalism.
    • Shared feedback between our teams on various nuclear sites.
    • Trained, qualified and skilled staff

    All our stakeholders have thorough knowledge of the nuclear industry over the life phases of an INB (Basic Nuclear Facility) :

    • Competence in nuclear engineering and radiation protection
    • Competence in risk analysis and safety assessment
    • Establishment of onsite operating procedures
    • Knowledge of modelling tools (radiological consequence calculation codes…)
    • Good writing and interpersonal skills (communication skills)
    • Good awareness of safety culture

    Strengths : adaptability, flexibility

    • Our operations are adapted to the actual needs of our clients and the specificities of each company.
    • We guarantee support from draft-design phase to the commissioning of facilities up until end of life of a facility.
    • We support operators in case of safety issues temporary overload.
    • We operate in France and abroad in French and in English.



  • Our operations

    sres-technologies-defense-en-profondeurOur consultants and engineers specialised in safety assessment support customers on projects related to civilian and military facilities.

    • Safety expertise
      o To provide operators with answers (following ten-yearly safety reassessments or specific correspondence)
      o For nuclear safety authorities (NSA, DNSA…)
    • Failure scenario analysis in the framework
      o Of internal emergency plans update
      o Of dreaded event assessments during modification works within an active facility
    • Assessment of ionising radiation effects on workstations to carry out radiation protection assessment concerning workers and compare to regulation
    • Analysis of nuclear risks and potential aggression sources of internal and external origin to control risks and define safety requirements in the following fields :
      o Nuclear: new operation or material change within a nuclear facility
      o Logistics/nuclear transport: transport operations of nuclear equipment
    • Gas and/or radioactive liquid release (chronic or accidental) scenario studies to assess dosimetry impact and its acceptability within the facility on operators and its immediate environment
    • Support Organisational and Human Factors (OHF) analysis specialists in controlling nuclear risks within facilities and make them more robust by the completeness of safety requirements, with requirements from OHF perspective
    • Support reactor operation and thermal-hydraulic engineers and raise awareness on safety culture and carry out as a team safety studies combining transverse engineering studies
    • Support and advise radiological investigations and dismantling studies engineers during a joint decision to choose the right dismantling scenario in a nuclear project

    Study subjects

    Safety studies and assessments of nuclear facilities in normal operation situation (and degraded modes) and incidental situation.

    Identification of incidental and accidental situations (fire, falling load, loss in utilities and electricity supply) and associated defence in depth provisions.

    Design and update of nuclear facility safety baselines (Basic Nuclear Facility or Secret Basic Nuclear Facility): RGE, PUI and application files for the authorisation of modifications.

    Drafting of safety and safety requirements assessments to be translated into operational documents (procedure booklet…).

    Complementary safety studies: integration of POST FUKUSHIMA learnings, safety reassessment and elaboration of activity reports concerning a basic nuclear facility or a group of them.

  • Giving the floor to...

      Join us !

    • Pierrick L.

      Pierrick L.

      Safety Engineer

      « I have been holding a safety engineer position at the Phénix plant for the past 7 years. I have had the opportunity to work on establishing the DEM decree application file, especially by updating the plant’s Safety Report. I have mainly focused on the examination of such file by the Safety Authority and its technical support, the IRSN. I have had the opportunity to answer several IRSN questionnaires and draft commitments pledged by the plant following the meeting of the Permanent Group of Experts for Laboratories and Factories (PGF) on 12 November 2014 which marked the end of examination. ».

    • Xavier D.

      Xavier D.

      Head of Safety

      « I am responsible for studies and assessments destined to evaluate the safety of very diverse nuclear facilities, and the fuel cycle. I assess risks, elaborate and draft safety studies to update safety baselines. I implement and develop regulatory safety study methodologies for Seres Technologies. I check deliverables and supervise other consultants to ensure good transmission of my feedback and skills. ».