Senior / Principal Mechanical Engineer - Nuclear
- Derby, Manchester, Sheffield, Epsom, Bristol, Glasgow
- Nuclear
Are you an experienced Mechanical Engineer who is passionate about making the world a better place? Would you be excited to play a part in supporting the fight against climate change?
Do you thrive in collaborative, creative environments?
Are you looking for a challenging role that allows flexible working and work-life balance? If this sounds like you, then we’d love to hear from you.
We are looking for Senior / Principal Mechanical Engineers to join our expanding Reactor Operations team, based in the UK. In this role, you will lead and manage a diverse and challenging range of complex projects for our clients, with opportunities to work within AtkinsRéalis design teams or directly with our clients by being embedded into their major programmes.
Whether you possess a breadth of experience from working across different markets or industries, or you are a Subject Matter Expert, we have the pipeline of opportunities to ignite your career and take your skills and experience to the next level. The variety and scale of projects we work on means that there is something for everybody, and we work hard to make sure that all of our staff have fulfilling and rewarding careers. Whatever our individual roles, we approach everything we do with a sense of curiosity, care, courage and community.
You will have the opportunity to apply your existing skills and develop new skills across a wide range projects across the full UK nuclear industry. In Reactor Operations, your core work will involve leading the design and substantiation of mechanical equipment to the highest standards of safety, quality, and efficiency, to enable the continued operation and life extension of our UK fleet of nuclear power stations and nuclear-powered submarines. Our team also work closely with our Power New Build business, supporting Hinkley Point C, Sizewell C, and the development of Small Modular Reactors and Fusion Energy reactors, as well as our Decommissioning business, supporting the safe dismantling, processing and packaging of nuclear waste at the UK’s nuclear estate at Sellafield and across the UK’s decommissioning power stations and nuclear-powered submarines.
Your purpose:
- Leading on the delivery of a wide range of mechanical engineering projects.
- Provide technical expertise and guidance to project teams.
- Performing feasibility and optioneering studies to generate design solutions to problems.
- Development of engineering solutions through the design lifecycle; Concept, Scheme, Detailed Design and Construction.
- Supporting the development of bids and value propositions.
- Management of project budgets, schedules, and resources to ensure timely and cost-effective delivery.
- Confidently liaising with, presenting to, and influencing stakeholders at all levels both internally and externally, in understanding their issues, goals, and processes and to build strong, lasting relationships.
- Supporting and developing the careers of junior engineers, fostering a culture of continuous learning and development.
What you can bring:
- Degree qualified mechanical engineer, or other relevant qualification.
- Chartered or incorporated with a relevant professional institute e.g., IMechE.
- Experience leading the design and/or substantiation of mechanical equipment, which could include mechanical handling systems, machinery, test rigs, or mechanical components.
- Experience operating engineering software for production of 3D CAD models, drawings, calculations, and Finite Element Analysis models.
- Experience working within design codes, standards and regulations typical for the engineering industry e.g., ASME, Eurocodes, BS EN13001, RCC-M, machinery directive, HS&E legislation.
- Experience in hazard / fault identification studies e.g., ERICPD, HAZOP, HAZAN, FMEA.
- Experience in writing, checking, reviewing, and approving technical reports and documentation e.g., design calculations, basis of design, safety case reports, design reports.
- You are comfortable using your own judgement when managing uncertainty and technical risk.
- You are excited when you identify new opportunities, win work and contribute to growth.
- Previous experience of working in the UK nuclear industry, or another highly regulated industry, would be an advantage.
Why work for AtkinsRéalis?
The UK is the first major economy to legislate for a Net Zero target by 2050. To achieve this, our Energy Teams are ensuring a mix of secure and sustainable energies that can meet our industry and lifestyle demands today, and in 30 years' time. We help to power our world through exciting new technologies and intelligent cybersecurity systems on projects that vary greatly in size, scope, and scale. So, you'll be creating the right safe and resilient systems across nuclear power, renewables, decarbonisation development, new builds and energy efficiency.
We value your diversity and believe that everyone deserves to thrive – no exceptions. You'll be part of a culture committed to finding new talent from underrepresented groups. We're Disability Confident, an Inclusive Employer, and support STEM Returners. We also want to see more women in senior roles at AtkinsRéalis. In the energy sector, we've signed up to the AXIS Pledge, promising to make equal pay, equal leadership, and equal opportunities a reality.
Security clearance:
This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.
We are committed to promoting a diverse and inclusive community - a place where we can all be ourselves, thrive and develop. To help embed inclusion for all, from day one, we offer a range of family friendly, inclusive employment policies, flexible working arrangements and employee networks to support staff from different backgrounds. As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.
#LI-Energy #RoadJobs #MechNPJobs
Design your future! Sign up for job alerts straight to your inbox so you don't miss your next opportunity. Subscribe to jobs like this!
Great news! We will let you know when a new job like this has been added!

Preview
AsiaContent type
BlogsPublish date
05/14/2025
Summary
Civil engineering is the backbone of modern infrastructure and a blend of creativity, technical expertise, and vision. Few professionals embody these qualities as comprehensively as Robert Santi
Meeting your needs
We offer a fantastic range of benefits to choose from, which you can tailor to suit your own health, wellbeing, financial and lifestyle choices.
Click here to see our full list of benefits
Preview
AsiaContent type
BlogsPublish date
05/14/2025
Summary
Civil engineering is the backbone of modern infrastructure and a blend of creativity, technical expertise, and vision. Few professionals embody these qualities as comprehensively as Robert Santi
Design your future! Sign up for job alerts straight to your inbox so you don't miss your next opportunity. Subscribe to jobs like this!
Great news! We will let you know when a new job like this has been added!
Meeting your needs
We offer a fantastic range of benefits to choose from, which you can tailor to suit your own health, wellbeing, financial and lifestyle choices.
Click here to see our full list of benefitsRelated job roles
Salary
Location
Kincardine
Job Type
Full Time
Career Area
Engineering (Other)
Market
Nuclear
Category
Permanent
Location
Kincardine
Description
Quality Control InspectorAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and around
Reference
R-131353
Expiry Date
01/01/0001
Salary
Location
Mississauga
Job Type
Full Time
Career Area
Mechanical engineering
Market
Nuclear
Category
Permanent
Location
Mississauga
Description
Technical Manager, Reactor MaintenanceAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Cana
Reference
R-131258
Expiry Date
01/01/0001
Salary
Location
Mississauga
Job Type
Full Time
Career Area
The Society of Professional Engineers and Associates - Operations & Administration
Market
Nuclear
Category
Permanent
Location
Mississauga
Description
Project CoordinatorAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and around the w
Reference
R-131218
Expiry Date
01/01/0001
Salary
Location
Derby
Job Type
Full Time
Career Area
Automation / Instrumentation
Market
Nuclear
Category
Permanent
Location
Derby
Sheffield
Bristol
Description
Are you good at leading and developing others while managing multiple project and tasks to meet changing demands and find the best solution for your needs? Do you enjoy solving complex problems and st
Reference
R-131180
Expiry Date
01/01/0001
Author
Shaik Mohammed Touheed AhmedAuthor
Shaik Mohammed Touheed AhmedSalary
Location
Mississauga
Job Type
Full Time
Career Area
Procurement
Market
Nuclear
Category
Permanent
Location
Mississauga
Description
Order Administrator (Expeditor)AtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and
Reference
R-131140
Expiry Date
01/01/0001
Salary
Location
Oak Ridge
Job Type
Full Time
Career Area
Procurement
Market
Nuclear
Category
Permanent
Location
Oak Ridge
Richland
Description
Why join us? It’s an exciting time at AtkinsRéalis! We are rapidly growing in the US. Our company purpose is to build a better world for our planet and its people. We recognize the importance of mak
Reference
R-131090
Expiry Date
01/01/0001
Salary
Location
Mississauga
Job Type
Full Time
Career Area
Risk management
Market
Nuclear
Category
Permanent
Location
Mississauga
Description
Risk AnalystAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and around the world si
Reference
R-131057
Expiry Date
01/01/0001
Salary
Location
Mississauga
Job Type
Full Time
Career Area
Procurement
Market
Nuclear
Category
Permanent
Location
Mississauga
Description
Export/ Import Permit ManagerAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and ar
Reference
R-131035
Expiry Date
01/01/0001
Salary
Location
Pickering
Job Type
Full Time
Career Area
The Society of Professional Engineers and Associates - Operations & Administration
Market
Nuclear
Category
Student
Location
Pickering
Description
Engineering StudentAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada and around the w
Reference
R-131011
Expiry Date
01/01/0001
Salary
Location
Mississauga
Job Type
Full Time
Career Area
Engineering (Other)
Market
Nuclear
Category
Permanent
Location
Mississauga
Description
Senior Safety Engineering AnalystAtkinsRéalis is one of Canada's largest private sector nuclear engineering groups. We have been providing a wide range of services to the nuclear industry in Canada an
Reference
R-131007
Expiry Date
01/01/0001
Related articles

Preview
EuropeContent type
BlogsPublish date
05/13/2025
Summary
After a successful first quarter in our new Manchester office, we're proud to be settling into a space that truly reflects an ambitious step forward in our mission to drive innovation in nuclear an
.jpg)
Preview
GeneralContent type
BlogsPublish date
05/09/2025
Summary
Environmental sustainability is no longer a niche priority, it’s becoming the heartbeat of progress across every industry. As the world faces urgent climate challenges, businesses everywhere are
.jpeg)
Preview
GeneralContent type
BlogsPublish date
04/10/2025
Summary
Engineering is a massive contributor to the global economy, which means there’s always a huge demand for different jobs in the sector. The engineering market is expected to grow to USD 3.5 trillion

Preview
Middle EastContent type
BlogsPublish date
04/01/2025
Summary
Mechanical engineering is at the heart of the UAE’s ambition. The UAE’s construction market size of $100.7 billion is projected to grow by more than 3% by 2029 thanks to infrastructural development, p

Preview
EuropeContent type
BlogsPublish date
03/24/2025
Summary
My name is Kamal. I was born in Lebanon, where I also attended school (below is a beautiful picture of Lebanon). I completed my university days in Lebanon, Texas and London. I'm a Structural Engin

Preview
EuropeContent type
BlogsPublish date
03/12/2025
Summary
Hi, I'm Lana. I hold a French engineering degree in geotechnical and civil engineering from Polytech Grenoble, which included a two-semester Erasmus+ exchange at Loughborough University. My journ

Preview
CanadaContent type
BlogsPublish date
03/03/2025
Summary
Snippet title Lire en français Mechanical engineering jobs in Canada are in higher demand than ever. With technological advancements and a growing emphasis on sustainability in the industry
.jpg)
Preview
AsiaContent type
BlogsPublish date
02/11/2025
Summary
Hong Kong is a city that never stands still. With its towering skyline, ever-evolving infrastructure, and commitment to sustainability, it's no surprise that the demand for skilled engineers is soarin

Preview
EuropeContent type
BlogsPublish date
02/04/2025
Summary
Hi, I'm Ahmad, the regional leader of AtkinsRéalis' Power New Build team here in the Northwest of England. Why did I join AtkinsRéalis? I wanted to be part of a world-class engineering services p

Preview
IndiaContent type
BlogsPublish date
01/31/2025
Summary
Do you want to fuel your career with purpose and watch your impact grow? Would you like to make an impact and join the global net zero revolution? Do you have what it takes to lead the nuclear r

by
Shailaja Mantha
Talent community
Would you like to know more? Not ready to apply? Join our talent community to stay connected and engaged with us at AtkinsRéalis.
Find out more