Senior Principal Mechanical Engineer

TN United Kingdom; Bristol; Hybrid; GBP 60,000 - 100,000; Full time

Job summary

An established industry player in nuclear engineering is seeking a Senior Principal Mechanical Engineer to join their Fusion and Modular Nuclear Business Unit. This role offers the chance to lead innovative projects aimed at achieving net-zero power generation. You will oversee the design and development of critical systems, ensuring compliance with regulatory standards while collaborating with diverse teams. The company values internal growth, providing ongoing training and career opportunities in a hybrid work environment. If you're passionate about making a global impact in the nuclear sector, this is the opportunity for you.

Benefits

Attractive social benefits

Holiday bonuses

Ongoing training

Career opportunities

Internal promotions

Qualifications

• Skilled in managing and coordinating diverse engineering teams.
• Experienced in budgeting and planning for full design lifecycles.
• Strong track record in designing and optimizing cooling water systems.

Responsibilities

• Lead and support the development of designs for critical nuclear systems.
• Conduct DFMEA and HAZID to mitigate potential risks.
• Coordinate interfaces between engineering teams and stakeholders.

Skills

Multi-Disciplinary Team Leadership

Steam Cycle Modelling Oversight

Project Budget & Lifecycle Planning

Cooling Water Equipment Expertise

Regulatory & Compliance Knowledge

Requirements Capture Experience

Systems Engineering Awareness

Subcontractor Management

Security Clearance Eligibility

Education

Chartered Engineer (CEng)

Job description

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Senior Principal Mechanical Engineer, Bristol

Client:

ASSYSTEM

Location:

Bristol, United Kingdom

Job Category:

-

EU work permit required:

Yes

Job Reference:

46b1572c2c7a

Job Views:

4

Posted:

28.04.2025

Expiry Date:

12.06.2025

Job Description:

Join the Fusion and Modular Nuclear Business Unit! Assystem has an exciting opportunity for a Senior Principal Mechanical Engineer 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 on multiple cutting-edge projects developing technical solutions to make net-zero power generation a reality.

Your mission:

• Lead and support the development of designs for systems such as Personnel Airlocks, Main Equipment Access Hatches, Fuel Transfer Channels, Piping and Electrical Penetrations, and 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.
• Oversee the creation of comprehensive Design Packages, ensuring alignment with project specifications, standards, and operational needs.
• Coordinate interfaces between engineering teams, suppliers, and stakeholders to ensure seamless integration of cooling water systems with other reactor components.
• Develop detailed Technical Specifications for procurement, fabrication, and installation of key cooling water system components.
• Collaborate with cross-functional teams, including both 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 on time and within budget
• Act with integrity and instill this in others
• Appreciation of wider technical issues beyond own discipline – understanding interdisciplinary challenges and their impact on projects.
• Ability to work independently, using own initiative and self-motivation
• Confident working in a multi-party, multi-national environment
• Willingness to travel within the UK to Assystem offices and customer sites
• Support major UK and international Nuclear Clients through work packages – contributing to high-profile nuclear projects with global impact.

Note: Due to the nature of work, applicants may need to meet residency criteria to attain UK security clearance if not already cleared to SC level.

We are committed to equal treatment and diversity. We believe that diverse backgrounds and perspectives foster innovative solutions. Your skills, talent, and willingness to contribute are what matter. Bring your unique contributions and help us shape the future.