Restoring Reliability to a Critical Fuel Route System: Designing and delivering a modern pneumatic control panel for long-term operational resilience

Within the IFD operating cell, a complex pneumatic network distributes instrument air used to actuate equipment inside the inner cell.

The system had historically been constructed using nylon (Polypenco) pipework routed through a densely populated pneumatic cabinet in the control room. While this design had supported operations for many years, inspection identified that elements of the pipework were beginning to degrade with age.

Although the system continued to operate effectively, the potential for pipework deterioration to affect long-term reliability prompted EDF to explore a proactive engineering solution. The challenge was compounded by the cabinet’s compact layout and complex pipe routing, which made replacing individual sections of pipework impractical.

Rather than attempting incremental repairs, the project team agreed that replacing the entire pneumatic cabinet as a single engineered assembly would provide the most reliable and maintainable long-term solution.

AMS Nuclear approached the challenge through a staged engineering programme designed to minimise risk and ensure that the final solution was informed by verified site data.

The project was divided into three phases:

• System investigation and survey
• Detailed engineering design
• Manufacture, testing and delivery of the replacement panel

This structured approach allowed the engineering team to fully understand the existing system before designing a replacement that would integrate seamlessly with plant operations.

The project began with a detailed survey of the existing electrical and pneumatic cabinet located within the IFD control room.

AMS Nuclear engineers carried out a comprehensive investigation of the installed equipment, pipework routes and control interfaces. From this information, the team developed an accurate Process and Instrumentation Diagram (P&ID) representing the existing pneumatic configuration.

This step was critical. By establishing a clear technical baseline, AMS Nuclear ensured that the subsequent design phase could be based on verified site information rather than assumptions.

The resulting documentation formed the foundation for the next phase of the project.

With the system configuration fully mapped, AMS Nuclear developed a detailed design for the replacement pneumatic panel.

The engineering package included:

• Mechanical layout drawings
• Electrical schematic diagrams
• Process and Instrumentation Diagrams (P&ID)
• Instrument, valve and component schedules
• Assembly documentation and recommended spares lists

The design centred on a wall-mounted enclosure approximately 1700 mm high, 825 mm wide and 200 mm deep, providing sufficient space to house the pneumatic control equipment while maintaining compatibility with the existing installation.

The panel incorporated a carefully engineered arrangement of valves, regulators, filtration systems and control interfaces designed to distribute instrument air reliably across the IFD equipment network.

Key components included:

• Instrument air isolation and pressure regulation
• Directional control solenoid valves for actuator control
• Pneumatic filtration and lubrication systems
• Vent manifolds and contaminated vent filtration
• Terminal arrangements for electrical connections

Throughout the design phase, AMS Nuclear engineers refined the panel layout to ensure that the final system would provide improved accessibility, maintainability and long-term operational robustness.

Following design approval, AMS Nuclear manufactured the replacement pneumatic cabinet at its Bridgwater engineering facility.

The finished assembly consisted of a powder-coated mild steel enclosure housing the full pneumatic distribution system. Stainless steel isolation valves, Swagelok tubing and fittings and clearly labelled components were incorporated to provide a durable and maintainable installation.

The completed panel included:

• Instrument air filtration and regulation
• Safety relief protection
• Directional control solenoid valves
• Vent manifolds and contaminated vent filtration
• Structured terminal arrangements for electrical interfaces

Before delivery, the panel underwent Factory Acceptance Testing (FAT) to verify system performance and confirm functionality against the design specification.

Comprehensive documentation was produced alongside the manufactured panel, including:

• Manufacturing Quality Plan
• Factory Acceptance Test documentation
• As-built drawings and assembly schedules
• A technical file demonstrating compliance with relevant directives

This ensured that the new system was fully verified and supported by complete lifecycle documentation.

By combining site investigation, detailed engineering design and precision manufacturing, AMS Nuclear delivered a modern pneumatic control panel designed to support reliable long-term operation of the IFD system.

The replacement assembly provides a structured and maintainable solution that reduces reliance on ageing components while maintaining compatibility with existing plant infrastructure.

Equally important, the project delivered a fully documented engineering package, enabling the station’s teams to manage, maintain and support the system confidently throughout its operational life.