---
title: "Provision of Instrument to Determine UF3 and UF4 Ratio in Molten Uranic Fuel Salt Matrices"
ocid: "ocds-h6vhtk-05d2b2"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-05d2b2"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-05d2b2.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-05d2b2.json"
source: "Find A Tender Service"
current_stage: "Planning"
buyer: "UNITED KINGDOM NATIONAL NUCLEAR LABORATORY"
published: "2025-11-07"
---

# Provision of Instrument to Determine UF3 and UF4 Ratio in Molten Uranic Fuel Salt Matrices

Buyer: UNITED KINGDOM NATIONAL NUCLEAR LABORATORY  
Current stage: Planning  
OCID: ocds-h6vhtk-05d2b2

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## Summary

The United Kingdom National Nuclear Laboratory (UKNNL) is currently in the planning stage for a procurement process titled "Provision of Instrument to Determine UF3 and UF4 Ratio in Molten Uranic Fuel Salt Matrices." This involves collaboration with Westinghouse at the Springfields Fuels site. The procurement falls under the nuclear industry category, specifically nuclear fuels and technical consultancy services, and is set in the UK. The procurement method revolves around market engagement, with a revised deadline for responding to the Request for Information (RFI) now set for 14th November 2025 at 5pm. This initiative aims to develop a methodology and an instrument critical for a substantial project involving the Integral Molten Salt Reactor (IMSR), with the next notice scheduled for the 28th November 2025.

This tender represents a significant opportunity for businesses specialising in nuclear evaluation instruments and technical analysis services, offering a gross amount value of £180,000. The project, suitable for SMEs, requires expertise in developing innovative measurement solutions that will contribute to advancing nuclear technology. Notably, businesses with experience in creating or testing nuclear fuels and related instruments are well-positioned to compete effectively for this contract. With the contract scheduled to start on 15th January 2026 and conclude by 15th January 2027, participating firms have the opportunity to engage in a project of national importance within the nuclear energy sector.

## Notice

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.

### Planning Information

Please respond by the deadline of 5pm 14th November 2025 by completing and returning the RFI document as per the instructions in the below link. The RFI document and specification are available to download at this address, please sign up to the CTM tendering portal if you have not already: https://uk.eu-supply.com/app/rfq/rwlentrance_s.asp?PID=99345&B=

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/071860-2025 |
| Notice type | UK2 - Preliminary Market Engagement Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Not Specified |
| Procurement method details | Not specified |
| Tender suitability | SME |
| Awardee scale | Not specified |
| All stages | Planning |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 7 Nov 2025 |
| Submission deadline | Not specified |
| Future notice date | 28 Nov 2025 |
| Award date | Not specified |
| Contract period | 15 Jan 2026 - 15 Jan 2027 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £150,000 |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | Not specified |

## Status

| Field | Value |
| --- | --- |
| Tender status | Planning |
| Lots status | Planning |
| Awards status | Not specified |
| Contracts status | Not specified |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | UNITED KINGDOM NATIONAL NUCLEAR LABORATORY |
| Locality | WARRINGTON |
| Post town | Warrington |
| Postcode | WA3 6AE |
| Country | England |
| ITL 1 | TLD North West (England) |
| ITL 2 | TLD6 Cheshire |
| ITL 3 | TLD61 Warrington |
| Local authority | Warrington |
| Electoral ward | Birchwood |
| Westminster constituency | Warrington North |
| Delivery location | TLD North West (England) |

## CPV Codes

### Divisions

- 09 - Petroleum products, fuel, electricity and other sources of energy
- 38 - Laboratory, optical and precision equipments (excl. glasses)
- 42 - Industrial machinery
- 71 - Architectural, construction, engineering and inspection services

### Codes

- 09340000 - Nuclear fuels
- 38940000 - Nuclear evaluation instruments
- 42151000 - Nuclear reactors
- 71621000 - Technical analysis or consultancy services

## Release History

- 7 Nov 2025 at 09:36 - PlanningUpdate - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/071860-2025
- 23 Oct 2025 at 14:30 - Planning - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/067904-2025

## Documents

- https://www.find-tender.service.gov.uk/Notice/071860-2025
  7th November 2025 - Preliminary market engagement notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/067904-2025
  23rd October 2025 - Preliminary market engagement notice on Find a Tender

## Notice URLs

- https://uk.eu-supply.com/app/rfq/rwlentrance_s.asp?PID=99345&B=
- https://www.legislation.gov.uk/ukpga/2023/54/contents
- https://www.nnl.co.uk/

## Provenance

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