FRP in Nuclear Decommissioning — Non-Sparking, Non-Contaminating, Lightweight Access for the UK's Most Demanding Sites
The UK's nuclear decommissioning programme is one of the most technically demanding infrastructure challenges in the world. Sellafield alone — the largest civil nuclear site in Europe — carries an estimated lifetime liability exceeding £130 billion and a decommissioning programme with timelines that extend to 2120 and beyond for the most complex legacy facilities. The environments inside active decommissioning buildings combine radiological hazard, aggressive decontamination chemistry, confined and restricted access, and a fundamental operational imperative to minimise the time personnel and equipment spend inside controlled zones. In that context, the choice of secondary infrastructure material — the cable trays, grating, walkway platforms, and structural supports inside decommissioning facilities — is not a commodity procurement decision. It is a material selection with consequences that determine operational safety, contamination control, and re-entry frequency across decades of programme delivery.
Published by Reinforce Technology | 30 September 2026
The Nuclear Decommissioning Authority manages a portfolio of 17 nuclear licensed sites across the United Kingdom, with an annual budget of approximately £3.2 billion and a total estimated programme cost that the NDA's own accounts place at over £130 billion. The decommissioning work ranges from reactor defuelling and dismantling at former Magnox stations to the management and retrieval of legacy nuclear materials from the oldest facilities at Sellafield, some of which have been accumulating hazardous inventory since the 1950s. Across all of these sites, the secondary infrastructure installed to support decommissioning operations — the access platforms, cable management routes, drainage systems, and structural supports in active areas — must perform to a standard that steel secondary infrastructure cannot always reliably meet (Nuclear Decommissioning Authority, 2024).
Why Material Selection Matters in Radiological Environments
The cost of working in a controlled radiological area is not simply the cost of the personnel and equipment time. It is the cost of the radiological dose accumulated by the workers, the dose planning and monitoring overhead, the personal protective equipment, the decontamination of tools and equipment on exit, and the operational disruption to the facility programme that any activity inside a controlled zone creates. Every hour of unnecessary re-entry for maintenance, inspection, or replacement of corroding secondary infrastructure is an hour of accumulated dose, an hour of programme time, and an hour of cost that could have been avoided with a material choice made at the point of initial specification.
Galvanised steel secondary infrastructure in nuclear decommissioning environments corrodes. The decontamination chemicals used routinely across nuclear facilities — dilute acids, alkaline decontaminants, and specialist chemical solutions for surface decontamination — attack galvanised zinc coatings from the first applications. Once the zinc coating is breached, the underlying carbon steel corrodes, generating particulate corrosion products that can become contaminated and represent an additional radiological waste stream requiring management and disposal. Corroded steel cable tray and grating also pits and roughens, increasing the surface area available for contamination to adhere to and making surface decontamination progressively less effective over the service life of the installation (World Nuclear Association, 2024).
FRP cable tray, grating, and structural sections do not corrode. The smooth, chemically inert surface of pultruded GRP cable tray and grating maintains its surface condition across its design life in chemical process environments, does not generate corrosion particulate, and decontaminates more effectively than pitted and corroded steel surfaces. For facilities where the decontamination and disposal of secondary infrastructure at end of operational life is itself a programme activity, the reduction in surface contamination and the elimination of corrosion particulate from FRP secondary infrastructure simplifies the end-of-life management of these components.
Non-Sparking: The Fire and Explosion Angle in Decommissioning Facilities
Nuclear decommissioning operations involve the cutting, dismantling, and processing of structures and components that may have accumulated hydrogen gas in voids and confined spaces — a known hazard in nuclear facilities, particularly those associated with legacy radioactive waste storage where radiolytic hydrogen generation from water in contact with radioactive materials is an ongoing process. In these environments, any spark-generating operation presents an ignition risk that must be controlled by permit and procedure.
Cutting and modifying galvanised steel cable tray or structural secondary infrastructure with an angle grinder or ferrous cutting disc generates sparks. In decommissioning environments where hydrogen generation is a documented hazard, this spark-generating operation requires hot work permit authorisation, atmospheric monitoring, and fire watch arrangements that add overhead to every cut and modification. FRP cable tray and structural sections cut without generating sparks — the glass fibre and resin matrix ablate without producing the metal particle ignition sources that ferrous cutting generates. In a decommissioning environment where the work programme is already operationally complex, the elimination of hot work permit requirements from cable management and secondary structural installation and modification reduces one layer of administrative overhead from the permit-to-work system (IntechOpen, 2022).
Lightweight: Critical for Confined Access Decommissioning Conditions
Many of the most hazardous decommissioning operations at Sellafield and other NDA sites take place inside buildings and structures where access is severely restricted — through airlocks, up ladders rather than stairs, through hatches and penetrations that limit the size and weight of equipment that can be brought in. In these conditions, the 75% weight saving of FRP cable tray and structural sections over their galvanised steel equivalents is not simply an installation convenience. It is the difference between a cable tray section that a single operative can carry through an airlock and up a ladder to the working level, and a steel section that requires mechanical plant to move — plant that may not be available or deployable inside the access restrictions of the facility.
A 3-metre FRP ladder tray section at 3 to 4 kg can be carried by a single operative in full personal protective equipment and respiratory protection through the access configurations typical of nuclear decommissioning facilities. The equivalent steel section at 12 to 16 kg cannot be safely manually handled under those conditions in full PPE. The weight reduction of FRP is therefore directly relevant to the human factors operating conditions of nuclear decommissioning, where every kilogram that the operative must carry is weight carried in PPE, in restricted access, with limited visibility and manual dexterity.
The reduced weight of FRP secondary structural installations also reduces the imposed load on ageing decommissioning facility structures that may have limited residual structural capacity for additional imposed loads from secondary systems installed to support the decommissioning programme.
Chemical Resistance in Decontamination Environments
Nuclear decommissioning facilities routinely use chemical decontamination agents that would attack galvanised steel secondary infrastructure over time. Dilute nitric acid and citric acid solutions are used for surface decontamination of equipment and structures. Alkaline decontaminants are used for organic contamination. Specialist chemical gel systems are applied to building surfaces as part of decommissioning preparation. The cable tray, grating, and structural supports in the path of these decontamination operations are exposed to chemical contact that the zinc coating of galvanised steel is not designed to resist across repeated decontamination cycles.
Pultruded GRP profiles and cable tray in vinyl ester or epoxy resin systems provide chemical resistance across the spectrum of acids, alkalis, and decontamination solutions used in nuclear decommissioning environments. The chemically resistant resin matrix does not react with the decontamination chemistry and maintains its mechanical properties and surface condition across repeated chemical exposure cycles. This chemical resistance also means that FRP secondary infrastructure in decommissioning environments can itself be decontaminated using the standard decontamination procedures applied to other facility surfaces, without the chemical attack of the secondary infrastructure material that galvanised steel would experience under the same treatment (IntechOpen, 2022).
Radiation Resistance: What the Published Data Shows
Glass fibre reinforced polymer has documented resistance to ionising radiation that is relevant to its use as secondary infrastructure in radiological environments. Glass fibres are inherently resistant to ionising radiation — the silica glass matrix does not undergo significant structural change under the gamma dose rates typical of secondary infrastructure locations in decommissioning facilities, which are remote from the primary radioactive sources and typically receive cumulative doses orders of magnitude below the levels at which structural degradation of glass fibre occurs.
The resin matrix of pultruded GRP profiles can experience gradual degradation under sustained high dose rates, but the dose rate at secondary infrastructure locations — cable trays and grating on access platforms remote from the primary waste containers and process vessels — is typically within the documented service envelope of standard GRP materials over the timescales relevant to decommissioning programme phases. Project engineers specifying FRP for radiological environments should confirm dose rate conditions for the specific installation location against published material data for the resin system being specified. Reinforce Technology can provide material data in support of this assessment for project specifications (World Nuclear Association, 2024).
FRP Products for Nuclear Decommissioning
Applications
The FRP products most directly applicable to nuclear decommissioning secondary infrastructure specification are pultruded GRP grating for access platforms and walkways in active areas, FRP cable tray (ladder, perforated, and solid bottom configurations) for cable management through controlled and uncontrolled areas, and pultruded GRP structural profiles for secondary structural supports and framework in confined decommissioning environments. All of these product categories carry the non-sparking, non-contaminating, chemically resistant, and lightweight properties that differentiate FRP from galvanised steel in nuclear decommissioning applications.
The NDA's programme is a 100-year infrastructure challenge. The secondary infrastructure installed inside decommissioning facilities today must perform without corrosion maintenance, without generating contaminated corrosion particulate, and without creating ignition hazards in environments where hydrogen generation is a documented process. FRP cable tray, grating, and structural profiles are the material specification that meets those requirements where galvanised steel does not. The weight saving, the chemical resistance, the non-sparking installation, and the absence of corrosion across the design life are not incidental advantages. In a nuclear decommissioning environment, they are the specification requirement.
Reinforce Technology FRP for Nuclear Decommissioning
Reinforce Technology supplies pultruded GRP cable tray, grating, structural profiles, and access systems for UK infrastructure projects including radiological, chemical process, and classified atmosphere environments. Non-sparking. Non-contaminating. 75% lighter than steel. Chemically resistant to the decontamination and process chemicals used in nuclear facility environments. Contact us to discuss your decommissioning project specification and the correct FRP product selection for your application and controlled zone conditions.
FRP secondary infrastructure for nuclear decommissioning applications should be specified against the confirmed radiological dose rates, chemical exposure conditions, and structural requirements of the specific installation location. Reinforce Technology can provide material technical data in support of project-specific specification assessments. This blog does not constitute a material specification recommendation for any specific nuclear licensed site or facility.
References
IntechOpen (2022) 'Fibre-Reinforced Polymer (FRP) in Civil Engineering', in IntechOpen Engineering Series. Available at: https://www.intechopen.com/chapters/84203 [Accessed: 30 September 2026]. [Non-sparking during cutting and drilling; chemical resistance to acids and alkalis; 70–75% lighter than steel; 25–30-year maintenance-free design life in chemically aggressive environments].
Nuclear Decommissioning Authority (2024) NDA Annual Report and Accounts 2023/24. Available at: https://www.gov.uk/government/organisations/nuclear-decommissioning-authority [Accessed: 30 September 2026]. [NDA annual budget approximately £3.2 billion; portfolio of 17 nuclear licensed sites; total nuclear provision (lifetime liability) estimated at over £130 billion; Sellafield decommissioning programme timelines extending to 2120 for legacy facilities].
World Nuclear Association (2024) Nuclear Decommissioning. Available at: https://world-nuclear.org/information-library/nuclear-fuel-cycle/nuclear-waste/nuclear-decommissioning [Accessed: 30 September 2026]. [Decontamination chemistry including acid and alkaline systems used routinely in nuclear facility decommissioning; radiolytic hydrogen generation a documented hazard in legacy waste storage facilities; GRP materials used in nuclear applications within confirmed dose rate envelopes].
ScienceDirect (2025) 'Sustainable composites for metal replacement: Environmental assessment and material selection of fiber-reinforced polymer across industries', ScienceDirect, doi: 10.1016/S2667-3789(25)00051-3. Available at: https://www.sciencedirect.com/science/article/pii/S2667378925000513 [Accessed: 30 September 2026].
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