Senior Principal Mechanical Engineer

Overview

In this Senior Principal Mechanical Engineer role, you lead mechanical design for fusion and modular nuclear systems, driving reliable, safe solutions that enable net-zero power generation. You’ll work across cross-functional teams to develop key components and oversee risk management and compliance. The position offers opportunities to influence design standards, interfaces with suppliers, and contribute to high-profile nuclear projects with global impact. This role suits a proactive leader who shapes technical decisions in a regulated, multi-national environment.

Pay / Benefits

• Attractive social benefits
• employee committee
• holiday bonuses
• ongoing training
• numerous career opportunities
• internal promotions (70% of managers promoted internally)

Responsibilities

• Lead the development of designs for systems such as Personnel Airlocks, Main Equipment Access Hatch, Fuel Transfer Channel, Piping and Electrical Penetrations, and Specialist Nuclear Doors
• Conduct DFMEA to identify and mitigate potential failure modes early in design
• Perform HAZID to identify and document system risks
• Complete and maintain Human Factors Checklists for ergonomic design decisions
• Update and manage the project Risk Register
• Produce Design Packages aligned with requirements, standards, and operations
• Coordinate interfaces between engineering teams, suppliers, and stakeholders for integration of cooling water systems
• Prepare detailed Technical Specifications for procurement, fabrication, and installation of cooling water components
• Collaborate with cross-functional teams including internal staff and secondees across engineering and project functions

Key requirements

• Multi-Disciplinary Team Leadership
• Steam Cycle Modelling Oversight
• Project Budget & Lifecycle Planning
• Cooling Water Equipment Expertise
• Regulatory & Compliance Knowledge (ONR, Environment Agency, HSE)
• Requirements Capture Experience
• Systems Engineering Awareness
• Subcontractor Management
• Chartered Engineer (CEng)
• Security Clearance Eligibility (SC)

• Excellent communication, written and oral
• Strong leadership
• Delivery focus within time and budget constraints
• Cooling Water Equipment Expertise
• Steam Cycle Modelling
• Regulatory Compliance Knowledge

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