Who we are
Oakridge Sciences & Services, a nuclear safety engineering and consulting firm, based in Orléans in the Centre-Val de Loire region.
Oakridge is an independent French engineering and consulting firm specialising in the nuclear sector. We place our expertise at the service of the nuclear industry's leading players, in France and internationally, supporting them on projects involving safety, design and plant operation.
In December 2025, Oakridge joined the EP2C group, opening a new chapter in its development and strengthening its ability to support its clients on ever more ambitious projects. In this context, Samuel Sivault serves as Deputy Chief Executive Officer of Oakridge and drives this momentum of growth and transformation.
Our values
The pillars of our commitment
Excellence
We aim for the highest quality standards in every mission.
Innovation
We anticipate technological developments to deliver future-ready solutions.
Quality
Our certifications attest to our ongoing commitment to quality.
Integrity
Transparency and honesty are at the heart of all our professional relationships.
Governance
Samuel Sivault
Deputy Chief Executive Officer
A business developer and recognised executive in the field of nuclear engineering and safety, Samuel Sivault brings to OAKRIDGE more than 25 years of experience in deterministic and probabilistic safety analyses (DSA/PSA), the management of complex projects and strategic international development.
A graduate of ENSEEIHT in thermal-hydraulics and of INSTN in nuclear engineering, he began his career at Atomic Energy of Canada Limited (AECL), where he contributed to benchmark studies on two-phase flow-induced vibrations in the steam generators of CANDU reactors. He then continued his career at ANDRA and subsequently at Thales Training & Simulation, broadening his expertise in the analysis of nuclear waste data and in full-scale simulation of pressurised water reactors (PWR) through the SIROCCO simulator.
He went on to serve as International Group Manager at TOTAL - Hutchinson, where he led global programmes dedicated to mechanical power transmission systems, developing solid experience in international management and in the delivery of large-scale industrial projects.
In 2007, he joined the management of OAKRIDGE SAS, taking responsibility for operations as well as for the development of international nuclear safety projects relating to PWR, EPR and SMR reactors. Under his leadership, the company strengthened its position with the major players of the nuclear sector and progressively extended its international reach.
A visionary and an entrepreneur, Samuel Sivault initiated several strategic partnerships in India from 2015 onwards, contributing to the delivery of major nuclear engineering projects across Europe and Asia. Since 2023, he has also been supporting OAKRIDGE's development in South Africa, notably in the Cape region, through a local representation dedicated to risk-informed safety approaches, innovation and the development of new industrial collaborations. These initiatives have substantially strengthened OAKRIDGE's presence and recognition on the international stage.
Today, following OAKRIDGE's integration within the EP2C group (Engineering Procurement Construction Consulting), Samuel Sivault serves as Deputy Chief Executive Officer. In this capacity, he leads the company's strategic direction, the development of its activities and the coordination of its relations with the EP2C group. He heads multidisciplinary teams working for the leading players of the nuclear industry, such as ORANO, EDF, FRAMATOME, KHNP, IRSN/ASN and ESKOM.
His career path illustrates a rare combination of high-level technical expertise, strategic vision, international leadership and the ability to build lasting partnerships, in the service of the safety, innovation and performance challenges of the nuclear industry.