Principal Mechanical Engineer

Assystem UK Ltd; Olney; Hybrid; GBP 75,000 - 110,000; Full time

Benefits offered by this job

Hybrid work 1-2 days remote per week

Ongoing training & career development

Holiday bonuses

Employee Committee

Job summary

Assystem UK Ltd is seeking a Principal Engineer to lead Front Engineering activities for Small Modular Reactors, Advanced Modular Reactors and Fusion projects. You will work with multi‑disciplinary teams, delivering the engineering design scope and guiding a dedicated engineering group.

Your mission includes spearheading the delivery of cutting‑edge power station systems and taking charge of optioneering, ensuring ALARP compliance and robust safety cases across complex projects.

Qualifications

• Experience in highly regulated industries such as nuclear, thermal power, or oil and gas.
• Proven ability to lead design teams and deliver Front Engineering for SMR/AMR and fusion projects.
• Strong optioneering skills with experience crafting ALARP and BAT arguments.
• Mentoring and developing junior staff; leadership in small teams.

Responsibilities

• Lead engineering design teams and deliver FEED activities for SMR, AMR and Fusion projects.
• Chair design reviews and ensure safety, quality, and compliance across disciplines.
• Drive optioneering and integration of systems into plant infrastructure; ensure compliance with standards.

Skills

Nuclear industry experience

Optioneering

Leadership

Communication

Systems engineering

ALARP/BAT arguments

Mentoring

Tools

ASME standards

UK/EU codes

Job description

studies to pinpoint the ultimate solution that perfectly aligns with client objectives. Leading a dynamic team in crafting and refining essential design documents, from Process Flow Diagrams to Equipment Datasheets, ensuring precision and excellence at every step.Directing the development of Design Description Documents and Requirement Specifications, driving innovation and efficiency in every design aspect.Seamlessly integrating developed systems into the broader plant infrastructure for optimal performance and functionality. Serving as the technical guru for designated scopes, guaranteeing top‑notch expertise and oversight. Chairing exhilarating Design Reviews and leading HAZID/HAZOP studies with diverse, multidisciplinary teams to ensure safety and excellence in every project facet.Enforcing strict adherence to company statutory H&S Policies and regulations, while ensuring unwavering compliance with project and Quality Management System standards.

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

• Strong previous experience in highly regulated industries like nuclear, thermal power generation, or oil and gas.
• Expertise in thermal power systems and equipment, from steam turbines to pumps, with a keen understanding of nuclear power plant operations.
• Proficiency in optioneering and conducting studies to evaluate viable options, backed by a track record of crafting compelling ALARP and BAT arguments.
• Experience in mentoring and developing junior staff, along with a proven history of leadership in managing small teams.
• Exceptional communication skills for seamless interaction with internal and external stakeholders.
• Familiarity with ASME, European, and UK codes and standards, coupled with a deep understanding of Product Safety Legislation.
• Appreciation for requirements management and systems engineering principles.
• Results-oriented with the ability to work both independently and collaboratively, coupled with strong organizational skills.
• British National with eligibility for obtaining and maintaining full UK security clearance.

Additional Information

Due to the nature of the work, applicants must meet UK security clearance criteria.

Ready to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation!

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.

SummaryType: Full-timeFunction: EngineeringExperience level: Mid-Senior LevelIndustry: 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! Reporting to the FEED Engineering Manager you will be responsible for Delivering Front Engineering activities for Small Modular Reactors, Advanced Modular Reactors and Fusion projects. The Principal Engineer shall work closely with multi-disciplined teams and will deliver scope through leadership of an engineering design team.

Your mission: Spearheading the delivery of cutting‑edge power station systems! Taking charge of optioneering