---
title: "Supply of Flask Seals, Gaskets & 'O' Rings"
ocid: "ocds-h6vhtk-06780d"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06780d"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-06780d.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-06780d.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "SELLAFIELD LIMITED"
published: "2026-03-30"
---

# Supply of Flask Seals, Gaskets & 'O' Rings

Buyer: SELLAFIELD LIMITED  
Current stage: Award  
OCID: ocds-h6vhtk-06780d

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## Summary

Sellafield Limited has completed a procurement process awarding a contract for the supply of specialised flask seals, gaskets, and 'O' rings for nuclear waste transport flasks. This contract, intended to support the maintenance programmes throughout the plant, aligns with the main procurement category of goods within the industry classification of gaskets. The procurement was conducted using a limited method and awarded without prior publication of a call for competition due to technical reasons. The contract was signed on 12 March 2026 with James Walker UK Ltd, a supplier recognised for meeting high technical and quality standards, ensuring the availability of critical flask spares at Sellafield in Cockermouth, located in the UKD region.

This award represents a critical opportunity for businesses specialising in high-quality manufacturing of nuclear-related components to engage with important maintenance operations at Sellafield Limited. Firms with expertise in producing seals, gaskets, and 'O' rings to stringent standards would find significant opportunities to grow their market presence, ensuring continuity and reliability in nuclear transportation systems. This contract illustrates the demand for suppliers capable of meeting exacting quality and technical specifications, offering prospects for those able to deliver to such specialised requirements. James Walker UK Ltd's long-standing relationship with Sellafield Limited highlights the value of dependable suppliers within the nuclear energy sector.

## Notice

Supply of Nuclear Transport Flask Specialised Seals, Gaskets & 'O' Rings, to enable the repair and maintenance of the internal & external nuclear waste transport flasks. This will enable the continued support of the various maintenance programmes throughout the plant.

### Lot Information

Lot 1

This will be the Supply of Nuclear Transport Flask Specialised Seals, Gaskets & 'O' Rings, to enable the repair and maintenance of the internal & external nuclear waste transport flasks., to drawings and specifications developed over many years. This will enable the continued support of the various transport flask maintenance programmes throughout the plant and assist with the long term Sellafield mission. 

Sellafield are using a known supplier who over many years has demonstrated their capability to meet Sellafield requirements in relation to the complex technical and quality aspects of goods supplied. Transition to any new supplier would risk continuity of critical goods supply in onboarding a new supply to the required standards, and possible delays from such. They produce quality plans/ITP's for all in house and subcontract procedures required for manufactured items to the required standards This award under 32 (2)(b)PCR 2015 Regulations will ensure there is a secure source of critical flask spares, for the duration of the agreement.

### Procurement Information

The supply of critical spares is required for the maintenance and repair of nuclear transport flasks. They are extremely important to maintaining our contract with our customer. Each flask received generates revenue, which can then be used to fund other clean-up and decommissioning activities across the Estate. Regulation 32 (2)(b)PCR 2015 applies due to various technical complexities of scope, and quality requirements involved with the supply of these critical items.
The maintenance and repair of flasks & flask transport flasks is essential to the servicing of the suite of contracts in place between our client and the NDA. Due to the ad hoc nature of these requirements, it is difficult to ascertain trends with regards to predictions for all these spares. Sellafield Ltd requires suppliers to be capable of providing the Seals, Gaskets and 'O' Rings required up to CQR Quality Grade 1 in accordance with SLM 4.06.02 Contract Quality Requirements Manual. The contract is of high risk if spares stockouts lead to the unavailability of the flasks. Many of the spares are Quality Grade 01 and 02 and the suppliers for the flasks spares need to be approved by SL Quality and added to their Quality Approved Suppliers List (QASL). They produce quality plans/ITP's for all in house and subcontract procedures required for manufactured items. James Walker are a long standing supplier who has demonstrated their ability to meet both Sellafield technical and quality standards on these items over many years, with developed technical information regards material suitability, longevity, radiological suitability etc. A change in supplier would result in delays to maintenance and repair services on flask containers, our customer being unable to meet it's obligations , and loss of power generation. and would require approval from our customer.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/029204-2026 |
| Notice type | Award Notice |
| Procurement type | Standard |
| Procurement category | Goods |
| Procurement method | Limited |
| Procurement method details | Award procedure without prior publication of a call for competition |
| Tender suitability | Not specified |
| Awardee scale | Large |
| All stages | Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 30 Mar 2026 |
| Submission deadline | Not specified |
| Future notice date | Not specified |
| Award date | 12 Mar 2026 |
| Contract period | Not specified |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | £400,000 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Cancelled |
| Awards status | Active |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | SELLAFIELD LIMITED |
| Locality | WARRINGTON |
| Post town | Warrington |
| Postcode | WA3 6GR |
| 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) |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | JAMES WALKER |

## CPV Codes

### Divisions

- 34 - Transport equipment and auxiliary products to transportation
- 35 - Security, fire-fighting, police and defence equipment

### Codes

- 34312500 - Gaskets
- 35121500 - Seals

## Release History

- 30 Mar 2026 at 14:22 - Award - Award Notice - https://www.find-tender.service.gov.uk/Notice/029204-2026

## Notice URLs

- https://www.find-court-tribunal.service.gov.uk/courts/royal-courts-of-justice
- https://www.gov.uk/government/organisations/sellafield-ltd

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06780d. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-06780d.json.