Senior Principal Mechanical Engineer

Assystem; Bristol; Hybrid; GBP 50,000 - 75,000; Full time

Job summary

Assystem seeks a Senior Principal Mechanical Engineer to join their Fusion and Modular Nuclear division in Bristol. The role involves leading design initiatives for advanced nuclear systems and ensuring compliance with safety and regulatory standards. With a focus on innovation and sustainable energy solutions, candidates will support high-profile projects contributing to the energy transition.

Benefits

Attractive social benefits, including holiday bonuses

Ongoing training and numerous career opportunities

Engaging Employee Committee

70% of managers promoted internally

Hybrid work: 1-2 days remote per week

Qualifications

• Experience in managing diverse engineering teams.
• Strong track record in designing and optimizing cooling water systems.
• Knowledge of ONR, Environment Agency, and HSE regulations.

Responsibilities

• Lead and support the development of designs for various nuclear systems.
• Conduct DFMEA and HAZID studies to document risks.
• Oversee the creation of comprehensive design packages.

Skills

Multi-Disciplinary Team Leadership

Steam Cycle Modelling Oversight

Cooling Water Equipment Expertise

Regulatory & Compliance Knowledge

Systems Engineering Awareness

Excellent Communication Skills

Education

Chartered Engineer (CEng)

Job description

Assystem Bristol, England, United Kingdom

Senior Principal Mechanical Engineer

Assystem Bristol, England, United Kingdom

1 day ago Be among the first 25 applicants

Get AI-powered advice on this job and more exclusive features.

Assystem is a global leader committed to accelerating the energy transition. With 7,750 employees across 12 countries, we tackle the monumental task of switching to low-carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top-notch engineering, project management, and digital solutions.

Assystem is a global leader committed to accelerating the energy transition. With 7,750 employees across 12 countries, we tackle the monumental task of switching to low-carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top-notch engineering, project management, and digital solutions.

Job Description

Join the Fusion and Modular Nuclear Business Unit! Assystem has an exciting opportunity for a Senior Principal MechanicalEngineer to join our expanding Fusion and Modular Nuclear (FMN) business unit. As leaders in the design and development of new technologies, you will have the opportunity to work across multiple cutting-edge projectsdeveloping technical solutions making net-zero power generation a reality.

Your mission:

• ️ Lead and support the development of designs for the following systems:
• Personnel Airlocks, Main Equipment Access Hatch, Fuel Transfer Channel, Piping Penetrations, Electrical Penetrations, Specialist Nuclear Doors
• Conduct DFMEA (Design Failure Mode and Effects Analysis) to identify and mitigate potential failure modes early in the design process.
• ️ Perform HAZID (Hazard Identification Study) to assess and document risks across the system.
• Complete and maintain Human Factors Checklists to ensure ergonomics and usability are considered in design decisions.
• Update and manage the project’s Risk Register to track, evaluate, and mitigate emerging risks.
• Design Package Production in Line with Requirements – Oversee the creation of comprehensive design packages, ensuring alignment with project specifications, technical standards, and operational needs.
• Management of Interfaces – Coordinate effectively between engineering teams, suppliers, and stakeholders to ensure seamless integration of cooling water systems with other reactor components.
• ️ Preparation of Technical Specifications – Develop clear, detailed technical specifications to guide procurement, fabrication, and installation of key cooling water system components.
• Collaborate with cross-functional teams, including both new and existing FTEs and secondees across engineering and project functions.

Why Join the Community of Switchers?

• Over 55 years in nuclear engineering.
• Ranked among the top 3 largest nuclear engineering companies.
• Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
• Ongoing training with numerous career opportunities.
• 70% of our managers are promoted internally!
• Hybrid work: 1-2 days remote per week.
  
  

Qualifications

• Multi-Disciplinary Team Leadership – Skilled in managing and coordinating diverse engineering teams.
• ️ Steam Cycle Modelling Oversight – Ability to define modelling outcomes and ensure accurate implementation.
• Project Budget & Lifecycle Planning – Experienced in budgeting and planning for full design lifecycles.
• ️ Cooling Water Equipment Expertise – Strong track record in designing and optimizing cooling water systems.
• Regulatory & Compliance Knowledge – Well-versed in ONR, Environment Agency, and HSE regulations.
• Requirements Capture Experience – Skilled in gathering and defining technical requirements.
• Systems Engineering Awareness – Strong understanding of integrated design principles.
• Subcontractor Management – Experienced in overseeing and coordinating subcontractors.
• Chartered Engineer (CEng) – Professional accreditation in a relevant discipline.
• Security Clearance Eligibility – Capable of obtaining SC clearance for secure projects.
  
  

Additional Information

• ️ Excellent communication skills, written and oral
• Strong leadership skills
• Focus on delivering quality output to time and budget
• Act with integrity and instils this in others
• Has an appreciation of wider technical issues beyond own discipline – Understands interdisciplinary challenges and their impact on projects.
• Ability to work with a high degree of independence, using their own initiative and self-motivation – Proactive and capable of managing tasks autonomously.
• Confident in a multi-party, multi-national environment – Comfortable working with global teams and diverse stakeholders.
• ️ Ability to travel to Assystem offices and customer sites within the UK
• To undertake work packages supporting major UK and international Nuclear Clients – Contributes to high-profile nuclear projects with global impact.

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

Seniority level

• Seniority level

  Not Applicable

Employment type

• Employment type

  Full-time

Job function

• Industries

  Business Consulting and Services

Referrals increase your chances of interviewing at Assystem by 2x

Sign in to set job alerts for “Principal Mechanical Engineer” roles.

Engineering Manager / Mechanical Engineer

Engineering Manager / Mechanical Engineer

Greater Bristol Area, United Kingdom 1 week ago

Cardiff, Wales, United Kingdom 1 month ago

Principal Mechanical Engineer - Hydropower (Energy)

Bristol, England, United Kingdom 1 week ago

Senior to Principal Mechanical Engineer (Building Services)

Bristol, England, United Kingdom 6 days ago

Principal Mechanical Engineer - Water Industry

Bristol, England, United Kingdom 1 month ago

Principal Mechanical Engineer - Hydropower (Energy)

Cambridge, England, United Kingdom 1 week ago

Principal Mechanical Engineer - Hydropower (Energy)

Greater Bristol Area, United Kingdom 1 day ago

Principal Mechanical Engineer - Water Industry

Cardiff, Wales, United Kingdom 1 month ago

Frome, England, United Kingdom 2 weeks ago

Sharpness, England, United Kingdom 3 days ago

Whatley, England, United Kingdom 2 weeks ago

Chewton Mendip, England, United Kingdom 1 month ago

Bristol, England, United Kingdom 1 week ago

Bristol, England, United Kingdom 11 months ago

Bristol, England, United Kingdom 1 month ago

Severn Beach, England, United Kingdom 1 day ago

Bristol, England, United Kingdom 1 week ago

Bristol, England, United Kingdom 2 weeks ago

Mechanical Engineer / Senior Mechanical Engineer

Greater Bristol Area, United Kingdom 1 week ago

Bristol, England, United Kingdom 2 months ago

Bristol, England, United Kingdom 5 days ago

Mechanical Integrity Engineer - Structural Systems Design

Bristol, England, United Kingdom 4 days ago

Bath, England, United Kingdom 1 month ago

Bristol, England, United Kingdom 4 weeks ago

Midsomer Norton, England, United Kingdom 1 month ago

Bristol, England, United Kingdom 1 week ago

Bristol, England, United Kingdom 1 month ago

Advanced Powertrain Mechanical Design Engineer

Bristol, England, United Kingdom 3 hours ago

Bristol, England, United Kingdom 2 weeks ago

We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI.