Graduate Thermohydraulic Engineer

Joining the Safety Engineering team, this graduate role focuses on building technical expertise across thermal-hydraulics, computational fluid dynamics (CFD), and nuclear reactor safety analysis.

About the entity

Energise Your Career with Framatome UK – Powering a Safer, Smarter Nuclear Future

Framatome is a global leader in nuclear energy, recognised for delivering innovative, value-added technologies that design, build, maintain, and advance the world's nuclear fleet. With 20,000 employees in over 70 locations worldwide, we provide components, fuel, and control systems for nuclear power plants, along with a full suite of reactor services — all focused on improving safety, performance, and sustainability.

Backed by EDF Group (80.5%) and Mitsubishi Heavy Industries (19.5%), we're driving the future of clean energy. Here in the UK, our team is already 400 strong — and growing. As we expand our service offerings across the UK nuclear industry, we're aiming to reach 600 dedicated professionals in 2026.

Now's your chance to join a company that's shaping the energy transition — where your expertise will matter, your growth will be supported, and your work will help power generations to come.

Your missions

We are seeking a Graduate Thermohydraulic to join the Safety Engineering team at Framatome UK. This role is designed for a motivated graduate aiming to build expertise across thermal-hydraulics, computational fluid dynamics (CFD), and reactor safety analysis.

The role will focus on:

·          CFD modelling and simulation, supporting detailed fluid flow and heat transfer analysis within nuclear systems,

·         And to system-level thermohydraulic safety analysis and reactor transient modelling.

You will contribute to safety and design studies for current and future nuclear technologies (PWRs, EPRs, SMRs, and Generation IV reactors), combining high-fidelity CFD analysis with system-scale modelling tools.

Key Activities:

Under supervision and progressively increasing autonomy, you will:

·         Build and run CFD models for fluid flow and heat transfer in nuclear systems

·         Create meshes, set up simulations, and analyse results

·         Perform parametric and sensitivity studies

·         Support model validation and method development

·         Develop system-level models using tools like CATHARE or RELAP

·         Simulate reactor transients and analyse system behaviour

·         Assess safety margins and key assumptions

·         Contribute to technical reports and safety documentation

·         Support validation and quality processes

·         Collaborate with project teams and share knowledge

Key Outputs:

You will contribute to the preparation of:

·         CFD simulation models, results, and validation studies

·         Thermohydraulic calculation files and transient analysis outputs

·         Technical and safety analysis reports

·         Sections of reactor safety cases

·         Methodology notes and modelling guidelines

·         Technical presentations (internal and external)

You are

Essential Qualifications, Experience and Skills:

With a MSc or PhD in nuclear, fluid mechanics, thermal, or energy engineering. You will be a passionate engineer committed to excellence and eager to be part of a growing team.

We are seeking the following skills:

• Strong foundation in fluid dynamics and heat transfer

• Exposure to CFD tools (e.g., ANSYS Fluent, CFX, OpenFOAM, STAR-CCM+)

• Understanding of turbulence modelling, multiphase flow, and numerical methods

• Basic knowledge of system codes (CATHARE, RELAP, TRACE, MANTA)

Languages (level):

• English fluent (required)

• French – bonus