UK Public Sector Contracts & Tenders

UKNNL is seeking to establish a framework agreement with a single supplier/ joint venture to undertake the role of “Strategic Design Partner” to support UKNNL with Deconversion. The framework agreement will run for 4 years. The objective of this preliminary market engagement is to provide an update on the Deconversion Programme of work being undertaken by UKNNL and to brief the market on the upcoming tender exercise. The session will include an overview of the project, an outline of the tender procedure, framework agreement arrangement and call-of contracts and timeline of activities.

UKNNL is in collaboration with Westinghouse on Springfields Fuels (SFL) site in the development and substantiation of a commercial scale process for the manufacture of fuel salt for the Integral Molten Salt Reactor (IMSR) for a client. As part of the customer requirements, the fuel salt material must be provided to a set specification. UKNNL are seeking support to develop a proven methodology and instrument for measurement of the UF3/UF4 ratio that could then be utilised by UKNNL staff for the purposes of supporting the delivery of the fuel salt product to the client.

Request for information from companies with experience in muon technology.

The design and manufacture of a Fourier Transform Infrared (FTIR) Spectroscopy System. High level functional requirements as per below: 1. The FTIR equipment shall be capable of measuring the corrosion thickness on samples up to 10 µm. 2. The FTIR rig shall be operated remotely. 3. The FTIR equipment shall be capable of being operated in conjunction with an XY table, allowing the complete area of the sample to pass over the FTIR sampling area. 4. The probe head of the FTIR equipment must protrude from the end of the spiral wall plug to which it is fitted in order to allow the sample to be presented up to the probe with a clearance of 0.4mm +/- 0.1mm. 5. The probe head of the FTIR equipment shall be protected from damage that samples being pushed against it could cause. 6. The FTIR equipment shall include a desktop computer and software to support the analysis and display the results from the FTIR equipment. 7. The FTIR equipment shall be designed to withstand the in-cell environment. • Radiation In-cave: 30Gy/hour at 30cmo Out-of-cave: 10µGy/hour at 30cm • Temperature In-cave: 5°C to 45°Co Out-of-cave: 5°C to 35°C• All equipment shall operate in relative humidity of5% to 95% non-condensing. • All equipment shall operate at atmospheric pressure.

The requirement is to assess and propose commercial available products and processes to remedy deterioration of the physical fire protection barriers which maintain integrity of structural steel work in the event of an outbreak of fire.

The aim of this procurement is to procure a nuclear subject matter expert (SME) support to support Capex readiness and benefit reviews within the Project Management Authority (PMA) function. This will initially be a 12-month contract to undertake – • Project readiness/deliverability reviews • Detailed scoping and feasibility assessments • Learning from experience and project reviews. • Benefits identification, measurement and realisation. The successful party will be required to have demonstrable evidence of working and understanding of delivery of projects within nuclear facilities.

UKNNL is seeking expressions of interest from suitably qualified and experienced contractors to support the assembly, installation verification, and inactive commissioning of a new modular experimental rig at the Preston facility. The rig comprises a modular, three-storey structure incorporating multiple process and utility services. The appointed contractor will be responsible for mechanical assembly, installation checks, and inactive commissioning (without uranics) to enable active commissioning (with uranics) by others. 2. Scope of Work The contractor will be expected to undertake, as a minimum: Mechanical Assembly • Offloading, positioning, and installation of prefabricated rig modules • Mechanical assembly and integration of modules to form the complete structure • Installation of access platforms, supports, and ancillary equipment • Alignment, fixing, and structural integrity checks Interface & Service Readiness • Preparation and verification of interfaces for: o Gas services o Extraction/ventilation o Fluids o Electrical supplies • Coordination with service installation contractors • Ensuring connection points are accessible, correctly labelled, and compliant with drawings/specifications Electrical, Controls and Instrumentation: • Cross module connections • Final install • Connection to Pilot Plant electrical distribution network 1. Project Overview UKNNL is seeking expressions of interest from suitably qualified and experienced contractors to support the assembly, installation verification, and inactive commissioning of a new modular experimental rig at the Preston facility. The rig comprises a modular, three-storey structure incorporating multiple process and utility services. The appointed contractor will be responsible for mechanical assembly, installation checks, and inactive commissioning (without uranics) to enable active commissioning (with uranics) by others. ________________________________________ 2. Scope of Work The contractor will be expected to undertake, as a minimum: Mechanical Assembly • Offloading, positioning, and installation of prefabricated rig modules • Mechanical assembly and integration of modules to form the complete structure • Installation of access platforms, supports, and ancillary equipment • Alignment, fixing, and structural integrity checks Interface & Service Readiness • Preparation and verification of interfaces for: o Gas services o Extraction/ventilation o Fluids o Electrical supplies • Coordination with service installation contractors • Ensuring connection points are accessible, correctly labelled, and compliant with drawings/specifications Electrical, Controls and Instrumentation: • Cross module connections • Final install • Connection to Pilot Plant electrical distribution network Installation Verification • Completion of installation checks against drawings and specifications • QA/QC inspections and documentation • Identification and resolution of defects or non-conformances • As-built documentation and redlining Inactive Commissioning • Mechanical completion checks • Pressure/leak testing (where applicable) • Functional checks (non-energised / non-process) • Safety and compliance verification • Handover documentation and commissioning packs ________________________________________ 3. Contractor Requirements Interested parties should demonstrate: • Experience assembling modular or multi-storey industrial/process rigs or plant • Experience working with multi-disciplinary service interfaces (gas, fluids, extraction, electrical) • Commissioning and mechanical completion experience • Strong health, safety, and quality management systems to comply with CDM regulations • Ability to work within an operational facility environment • Relevant certifications and competencies ________________________________________ 4. Deliverables The appointed contractor will be expected to provide: • Method statements and risk assessments • Installation and commissioning plans • Inspection and test records • Mechanical completion dossiers • As-built documentation • Handover pack ________________________________________ 5. Programme (Indicative) • Site readiness: June 2026 • Assembly period: 3 months • Handover to active commissioning: September 2026

The United Kingdom National Nuclear Lab (UKNNL) requires the provision of an In Cave Vacuum System - Centralised Vacuum Cleaning System (CVCS). To ensure a comprehensive view on the current situation, we are issuing the attached Early Engagement RFI to receive input from the supply market. Early Engagement RFI Submission Deadline = 06/03/2025 (complete and return Early Engagement RFI In Cave Vacuum System). This exercise is a request for information, it does not constitute a formal procurement process. The purpose of this exercise is to assess the interest and capabilities within current markets to deliver this service. UKNNL may choose to contact suppliers based on the information provided in this questionnaire. If you prefer not to be contacted, please clearly indicate this preference in your questionnaire response. UKNNL assure you that any information provided during this exercise will not adversely affect the evaluation of any offers you may submit in response to any future Invitations to Tender. Brief Scope: UKNNL is seeking information from suppliers on their ability to design, manufacture, test and deliver a CVCS for use in a radiologically shielded AHF. The system will be used to support housekeeping during remote metal cutting operations by collecting hazardous swarf for safe disposal. It must be suitable for operation in a high-radiation environment, be capable of remote operation and maintenance, and be compatible with existing in cave handling equipment. The supplier would be expected to own the detailed design, using UKNNL provided concept information, and deliver one complete system, including testing and supporting documentation. This RFI is issued to understand current market capability and interest ahead of any future procurement.

United Kingdom National Nuclear Laboratory is undertaking pre-market engagement to inform the development of a Fabrication and Machining framework, structured as a multi-lot arrangement to support both nuclear and non-nuclear requirements. The framework is intended to provide access to suitably qualified suppliers, capable of delivering a range of fabrication and machining services, which may include (but are not limited to): - precision machining; - coded welding; - specialist fabrication; - component manufacture; - repair and modification activities; - associated quality, inspection and documentation services.

UKNNL would like to invite suppliers to apply to join a new Open Framework to support with the supply of Nuclear Technical Services for the United Kingdom National Nuclear Laboratory.