Thermal Hydraulic Analyst - Test Rig Scaling

Location: Derby, Derby or Warrington, Warrington

Organisation: Engineering

Department: Development Engineering

Required Security Clearance: BPSS

Job: Thermal Hydraulic Analyst – Test Rig Scaling

Location: Derby or Warrington (with remote working options)

Salary: Competitive Salary + Package + Bonus

Duration: Permanent

The Company

Rolls-Royce SMR is a start-up joint special purpose vehicle (SPV) business, specifically created to design, construct and deliver a new fleet of Small Modular Reactors power plants that will be a critical and strategic player in the race to Net Zero carbon emissions globally.  Spun out of Rolls-Royce with its pedigree in engineering excellence but also attracting world class inward investment this is an exciting new business with an optimistic opportunity to be a global player in the coming years.

The Position

The Development Engineering organisation is accountable for proving that the SMR power station design meets its objectives and requirements.  This encompasses not just the domain of nuclear engineering, but the broader range of engineering functions necessary to deliver a major infrastructure project.  The team’s remit includes defining the Verification Strategy for the power station and executing any verification activities that involve testing - and these range from laboratory-type tests through to highly complex system-level rig tests in some world-leading facilities.

This is a once in a generation opportunity to be at the centre of proving the design of a new nuclear power station and establishing a world class testing capability.  Talented individuals are invited to join the innovative, dynamic, and open culture of the SMR Test Capability Team to deliver this opportunity.

There are a variety of exciting and complex thermal hydraulic test rigs which are required to validate analysis methods used to verify the design of the SMR’s innovative passive Reactor Safety Systems.  All require thermal hydraulic scaling to ensure they are practical and affordable.

This role offers a rare opportunity to develop expertise in the field of thermal hydraulic scaling, particularly in the context of nuclear reactor systems.  Reporting to the Thermal Hydraulic Expert, the Thermal Hydraulic Analyst will be responsible for developing mathematical models in MATLAB (or similar) which replicate reactor thermal and hydraulic behaviour.  These models will be used to quantify thermal hydraulic scaling distortions and select test rig scaling ratios.

Although experience of thermal hydraulic scaling techniques is desirable, this role is open to candidates with relevant experience and who aspire to develop expertise in this field. Appropriate training and coaching will be provided.

Key Responsibilities

  • Work with the reactor performance and system design teams to understand the analysis methods being used, the analysis validation requirements and the thermal hydraulic phenomena to be modelled to assess the effects of scaling.
  • Apply technical expertise to develop mathematical models from first principles to replicate reactor thermal and hydraulic behaviour (produced in MATLAB, Python or similar).
  • Explore the test rig design space, using the mathematical models to quantify scaling distortions.
  • Work collaboratively with the rig design team and the systems and performance design teams to ensure that an optimised set of scaling ratios are defined, with acceptable scaling distortions to support analysis method validation.
  • Manage and plan own time to ensure delivery to cost, quality and schedule.
  • Understand and articulate technical and programme risks, managing them as appropriate with the Thermal Hydraulic Scaling Expert.
  • Act as a technical representative for the assigned test rigs at technical and project reviews.


  • Qualified to degree level or equivalent in engineering, physical sciences, mathematics, or a related discipline.
  • Chartered (or equivalent) or working towards professional accreditation.
  • Knowledge of fluid mechanics and thermodynamic fundamentals. Knowledge of reactor plant thermal and hydraulic behaviour is desirable.
  • Experience of developing mathematical models to replicate thermal hydraulic phenomena in MATLAB, Python or similar.

We aim to respond to suitable candidates within 5 working days. If you have not heard from us within this time, please feel free to contact us to receive feedback on your application.

To apply please send your CV to Kris Charnock at Morson or contact the Morson office for more information.