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Jacobs Thermal Hydraulicist in Birchwood, United Kingdom

Your Impact:

At Jacobs, we're challenging today to reinvent tomorrow by solving the world's most critical problems for thriving cities, resilient environments, mission-critical outcomes, operational advancement, scientific discovery and cutting-edge manufacturing, turning abstract ideas into realities that transform the world for good.

Energy, Security & Technology (ES&T)

Your mission is our mission.

We're invested in you and your success. Everything we do - whether Aerospace, Defense, Intelligence, Information Technology, Cybersecurity, Nuclear, Automotive, or Telecommunications - is more than just a project. It's our challenge as human beings, too. That's why we bring a thoughtful and collaborative approach to every one of our partnerships.

It's our promise to challenge the status quo as we redefine how to solve the world's greatest challenges and transform big ideas into intelligent solutions for a more connected, sustainable world.

Design your career with a company that inspires and empowers you to deliver your best work so you can evolve, grow and succeed –today and into tomorrow.

The Assurance, Technology and Regulation performance unit, is a critical part of the Technology and Consulting business within CMS-I. AT&R has been providing critical services to the Nuclear Industry for over 60 years.

Do you want to play a vital role in existing and new defence and civil nuclear programmes in the UK, and want to provide key control and instrumentation support to both defence and civil nuclear sectors?

Then this is the opportunity for you.

Jacobs is seeking to recruit a Thermal-Hydraulicist to join our Nuclear, Science and Engineering (NSE) team in Birchwood, Cheshire


This role provides a diverse and exciting range of opportunities, undertaking Independent Nuclear Safety and Technical assessment to support the safe operation of all classes of UK submarines across the entire plant life cycle.

From initial concept design through to plant life extension and subsequent decommissioning, this work presents interesting and unique technical challenges and therefore requires a strong commitment to deliver robust safety assurance services to the Ministry of Defence in support of the UK’s defence requirements including Continuous At Sea Deterrent

This role will be of particular interest to candidates with experience in thermal hydraulic modelling who are seeking to broaden their knowledge of the application of codes within design and safety cases.

Key responsibilities will include:

  • Providing independent nuclear safety and technical assessment of documents relating to naval nuclear propulsion plant systems and performance, and presenting advice to relevant safety and technical committees;

  • Representing Jacobs at safety and technical meetings with clients, propulsion plant designers and safety case authors;

  • Applying personal skills and technical experience to support subject matter experts from other disciplines and projects;

Here’s What You’ll Need:


You will have the following skills, attributes and experience. Applicants with thermal analysis experience from other industries are also welcomed as comprehensive training will be provided for all successful candidates.


  • Degree or Post Graduate qualification in a relevant engineering or scientific discipline;

  • Ability to assimilate, analyse and provide judgements on complex technical issues clearly and concisely, based on knowledge and understanding.

  • UK citizen with, or capable of gaining, SC clearance.

Desirable Skills

  • Experience of undertaking thermal hydraulics calculations of Pressurised Water Reactors and/or performance calculations, including; faults, severe accident, loss of cooling and decay heat removal conditions;

  • Experience of providing assurance activities (formal independent assessment, advice and inspection) in safety or mission critical applications;

  • Knowledge of Pressurised Water Reactor systems for naval propulsion or civil power generation applications;

  • Familiar with modelling codes used within the naval nuclear propulsion or civil power generation programmes;

  • Knowledge of the design or performance history of UK naval nuclear propulsion plant.

  • Experience of carrying out Independent Nuclear Safety Assessments.

  • Ability to communicate clearly and succinctly in writing and orally;

  • Good interpersonal skills with the ability to work as part of a team;

  • A willingness to travel within the UK if required;

  • Although knowledge of naval nuclear propulsion plant is desirable, applications from less experienced candidates and those currently employed within the civil nuclear industry is encouraged.

Applicants with thermal analysis experience from other industries are also welcomed as comprehensive training will be provided for all successful candidates.

Our Culture

Why Jacobs?

We’re invested in you and your success. Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business and we truly believe that by supporting one another through our culture of caring, we all succeed. We value positive mental health and a sense of belonging for all employees.

We aim to make inclusion and diversity core attributes of our identity, embedded in all our employment and business practices in all locations. We know that if we are inclusive, we’re more connected, and if we are diverse, we’re more creative.

Jacobs partners with VERCIDA to help us attract and retain diverse talent. For greater online accessibility please visit www.vercida.co.uk to view and access our roles.

As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

Successful candidates will be asked to complete a Baseline Personnel Security Standard Pre-Employment check and will be required to undergo various checks including: Identity, Right to Work; Employment/Education History and Criminal Record. If you are unable to meet this and any associated criteria, then your employment may be delayed or rejected.