Senior Principal Mechanical Engineer

Description

• ⚠️ Perform HAZID (Hazard Identification Study) to assess and document risks across the system.
• 🔗 Management of Interfaces – Coordinate effectively between engineering teams, suppliers, and stakeholders to ensure seamless integration of cooling water systems with other reactor components.
• 📝 Complete and maintain Human Factors Checklists to ensure ergonomics and usability are considered in design decisions.
• 🛡️ Lead and support the development of designs for the following systems:
• 📊 Update and manage the project’s Risk Register to track, evaluate, and mitigate emerging risks.
• ⏳ Focus on delivering quality output to time and budget
• 📦 To undertake work packages supporting major UK and international Nuclear Clients – Contributes to high-profile nuclear projects with global impact.
• 🛠️ 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.
• 📄 Design Package Production in Line with Requirements – Oversee the creation of comprehensive design packages, ensuring alignment with project specifications, technical standards, and operational needs.
• 🧠 Conduct DFMEA (Design Failure Mode and Effects Analysis) to identify and mitigate potential failure modes early in the design process.

Requirements

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.

• 🚀 Ability to work with a high degree of independence, using their own initiative and self-motivation – Proactive and capable of managing tasks autonomously.
• 🔑 Security Clearance Eligibility – Capable of obtaining SC clearance for secure projects.
• 📌 Requirements Capture Experience – Skilled in gathering and defining technical requirements.
• 🌟 Over 55 years in nuclear engineering.
• 🗣️ Excellent communication skills, written and oral
• 🔍 Systems Engineering Awareness – Strong understanding of integrated design principles.
• 📜 Regulatory & Compliance Knowledge – Well-versed in ONR, Environment Agency, and HSE regulations.
• ✈️ Ability to travel to Assystem offices and customer sites within the UK
• 👥 Multi-Disciplinary Team Leadership – Skilled in managing and coordinating diverse engineering teams.
• 🔍 Has an appreciation of wider technical issues beyond own discipline – Understands interdisciplinary challenges and their impact on projects.
• ♨️ Steam Cycle Modelling Oversight – Ability to define modelling outcomes and ensure accurate implementation.
• 🌍 Confident in a multi-party, multi-national environment – Comfortable working with global teams and diverse stakeholders.
• 🎓 Chartered Engineer (CEng) – Professional accreditation in a relevant discipline.
• 💰 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.
• 🤝 Subcontractor Management – Experienced in overseeing and coordinating subcontractors.
• 💼 Strong leadership skills

Benefits

🚀 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.

• 📚 Ongoing training with numerous career opportunities.
• 💼 Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
• 🏠 Hybrid work: 1-2 days remote per week.

Training + Development

Interview process

Visa Sponsorship

Security clearance