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Sizewell B life extension: the critical role of analogue integrity in nuclear asset renewal
EDF and the UK Government have recently reached a landmark agreement to extend the operational life of the Sizewell B nuclear power plant by a further 20 years, moving its planned closure from 2035 to 2055.
Operating since 1995, Sizewell B is the UK’s only pressurised water reactor and currently provides 3% of the nation’s energy, powering more than two million homes.
To achieve this ambitious target, EDF is preparing an estimated £800m investment focused on major plant modifications and infrastructure upgrades.
For instrumentation and process engineers within the nuclear supply chain, this announcement highlights a major industry-wide challenge: how can legacy control infrastructure be maintained, upgraded and secured without compromising rigorous safety standards?
The challenge of component obsolescence in critical infrastructure
When extending the life of a facility built in the 1990s, a complete digital “rip-and-replace” strategy for control panels is often unfeasible.
A total system overhaul can introduce extremely high capital costs, prolonged plant downtime and highly complex re-evaluations of safety cases.
Instead, plant operators must focus on smart asset renewal, replacing ageing or obsolete components within existing control loops.
However, sourcing reliable, fail-safe analogue process instrumentation that matches original specifications and complies with modern safety standards is becoming increasingly difficult as many manufacturers phase out legacy support.
Maintaining safety-critical loops: the SIL imperative
In nuclear power generation, there is zero margin for error.
Signal conditioning equipment, such as trip amplifiers, signal isolators and power supplies, must deliver absolute galvanic isolation and maintain precise 4-20mA loop integrity.
When upgrading legacy panels, engineers require drop-in replacements that adhere to strict Safety Integrity Levels, including SIL 1, SIL 2 and SIL 3.
Maintaining the robust simplicity of analogue architecture helps ensure that critical safety systems remain protected from the cybersecurity vulnerabilities and complex failure modes often associated with highly networked digital alternatives.
How Amelec Instruments supports the UK’s nuclear renaissance
As Robert Gunn, station director of Sizewell B, noted, this life extension secures jobs and supports the nation’s “nuclear renaissance”.
Amelec Instruments has been a dedicated partner to the UK energy and defence sectors since 1975 and is well positioned to support this new era of asset retention.
Procurement managers and control panel builders trust Amelec for critical legacy infrastructure for several reasons.
Exact-fit drop-in replacements
Amelec specialises in manufacturing components that help mitigate component obsolescence, ensuring existing control systems remain operational without requiring costly enclosure redesigns.
Uncompromising compliance
As a proudly British manufacturer, Amelec holds Achilles UVDB Silver Plus, LRQA ISO 9001, Cyber Essentials and JOSCAR registrations.
The 10-year warranty
Amelec engineers for longevity.
Every standard signal isolator, splitter and trip amplifier that leaves the facility is backed by an industry-leading 10-year warranty, helping provide long-term supply chain security.
Secure your supply chain today
As investment in the UK’s nuclear fleet continues to increase, securing a reliable, long-term supply of safety-critical instrumentation is vital.
Partner with a manufacturer that understands the importance of analogue integrity and legacy system support.
For more information on Life of Sizewell B extended by another 20 years talk to Amelec Instruments