Senior Principal Mechanical Engineer

Assystem UK Ltd; Bagstone; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Holiday bonuses

Employee Committee

Hybrid work: 1-2 days remote per week

Job summary

Assystem UK Ltd is seeking a Senior Principal Mechanical Engineer to join our Fusion and Modular Nuclear (FMN) unit. You will lead design development for cutting‑edge fusion projects, ensuring safe, compliant delivery on time and budget.

You will coordinate multidisciplinary teams, manage interfaces with suppliers and stakeholders, and prepare technical specifications for cooling water systems and related reactor components. Hybrid work is available.

Qualifications

• CEng Chartered Engineer with eligibility for UK security clearance.
• Experience leading multidisciplinary engineering teams on nuclear projects.
• Strong understanding of regulatory and safety requirements in nuclear design.

Responsibilities

• Lead design development for fusion and modular nuclear projects.
• Coordinate interfaces between engineering teams, suppliers and stakeholders.
• Prepare technical specifications for cooling water and reactor components.
• Ensure delivery to time, budget and applicable standards.

Skills

Multi-Disciplinary Team Leadership

Steam Cycle Modelling Oversight

Cooling Water Equipment Expertise

Regulatory & Compliance Knowledge

Systems Engineering Awareness

Subcontractor Management

Chartered Engineer (CEng)

Security Clearance Eligibility

Education

CEng Chartered Engineer

Job description

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 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 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 oralStrong leadership skills Focus on delivering quality output to time and budget Act with integrity and instils this in othersHas 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.

Summary

Type: Full-timeFunction: EngineeringExperience level: Not ApplicableIndustry: Management Consulting

Company Description

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in 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 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 across multiple cutting-edge projects developing technical solutions making net-zero power generation a reality.Your mission:Lead and support the development of designs for the following