RAETP Alarm Panel Replacement

Across the UK nuclear fleet, managing equipment obsolescence is an increasing priority as stations extend their operational lifetimes. At Heysham 1, the RAETP alarm system had served reliably for decades, but ageing components began to present a growing risk to long-term performance and maintainability.

EDF needed to modernise the system while preserving its proven operational principles. The challenge was not simply replacement but doing so in a way that maintained familiarity for operators, aligned with current standards and avoided unnecessary complexity. At the same time, the solution had to support regulatory compliance under the Category 3 Nuclear Safety Case, reduce the risk of degraded alarm performance and align with wider fleet lifecycle management strategies.

AMS Nuclear was entrusted with delivering the full scope, from design through to commissioning, applying a structured and safety-led engineering approach throughout. Rather than introducing a completely new concept, AMS Nuclear focused on retaining the original system logic while upgrading the underlying technology.

All activities were carried out in line with British, European and EDF standards, ensuring full regulatory alignment. The system was engineered for longevity, with a minimum 20-year design life supported by comprehensive documentation and a defined spares strategy to reduce future obsolescence risk.

The project followed a tightly controlled and phased delivery model to ensure quality, traceability, and minimal disruption to site operations. AMS Nuclear began with a detailed survey of the existing panel and its interfaces, building a complete understanding of system requirements before progressing into design.

Design documentation and drawings were developed and submitted for EDF approval, ensuring alignment at every stage. The new panel was then manufactured under controlled conditions and subjected to a Factory Acceptance Test (FAT), where full functionality was simulated and verified in the presence of the client.

Installation on site was carefully planned to minimise risk. By reusing existing fixings and interfaces, AMS Nuclear reduced intrusive work and enabled a smooth integration with existing plant systems. Final commissioning was carried out in accordance with EDF-approved procedures, supported by comprehensive Lifetime Quality Records to ensure full traceability and compliance.

Throughout delivery, AMS Nuclear operated under its ISO 9001-certified quality assurance framework, with inspection, surveillance and review points embedded at every stage.

This project highlights the value of combining site-specific engineering expertise with broader fleet experience. Drawing on previous alarm system replacement projects across the EDF fleet, AMS Nuclear was able to validate design decisions efficiently and deliver with confidence.

The work reinforced several key principles: early alignment on retaining proven design logic is critical, structured quality records play a vital role in supporting nuclear safety cases and minimising physical changes on site can significantly reduce installation risk and complexity.

By addressing obsolescence in a proactive and controlled way, AMS Nuclear supported EDF’s long-term strategy for maintaining safe and reliable nuclear operations, ensuring that critical systems continue to perform exactly as required, when it matters most.