Official UK procurement notice
MSSS Boxes Procurement · UK public procurement notice
Authority: Sellafield Limited (Public body)
What is being bought4 lots · detail below
Published requirement descriptionProcurement for the manufacture and supply of MSSS (Magnox Swarf Storage Silo) Box assemblies.
Please refer to Sections 1 & 2 of the ITT Template CFP Document for further information.
- How the procedure runs: The Procurement will be conducted in accordance with the Procurement Act 2023 and will consist of a 2 Stage Process: Stage 1. PSQ - Conditions of Participation: This stage consists of a combination of pass/fail and scored questions. There will be a maximum of 6 suppliers per lot who will be invited to participate in the ITT stage. Stage 2. ITT: This stage is for those who are invited to tender following being down-selected to 1 of the 6 successful suppliers per lot. This stage contains a combination of technical and commercial scored question. For further details on the procurement process, please see Section 3 in the ITT Template CFP Document.
CPV: Containers for waste material · Miscellaneous fabricated products and related items
Lots and requirements (4)Procurement structure
4 lots · all with a published value (£90,000,000 together) · a supplier may bid for at most 3 and win at most 1 of them · evaluation weights differ by lotLot #1Outer BoxPublished value£41,000,000
Outer Box: £35M-£41M
- Economic & financial standing
See PSQ criteria in Folder 1 PSQ Instruction
- Technical & professional ability
See PSQ criteria in Folder 1 PSQ Instruction
- Condition of participationshortlisting
See PSQ criteria in Folder 1 PSQ Instructions
Lot #2MSSS - SkipPublished value£32,000,000
MSSS - Skip: £27M-£32M
- Condition of participationshortlisting
See PSQ criteria in Folder 1 PSQ Instruction
Lot #3Box & Skip LidsPublished value£17,000,000
Box & Skip Lids
Range: £14-£17M
- Condition of participationshortlisting
See PSQ criteria in Folder 1 PSQ Instruction
Lot #4TEST PURPOSES ONLYPublished value£0
Lot 4 - TEST PURPOSES ONLY.
This Lot has been created as a test, please note there are only 3 Lots in this procurement
- Economic & financial standing
Lot 4 - TEST PURPOSES ONLY
- Technical & professional ability
Lot 4 - TEST PURPOSES ONLY
- Condition of participationshortlisting
Lot 4 - TEST PURPOSES ONLY
What it takes to wini
How this buyer will score bids.
The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).
Evaluation split and conditions of participation as published; the tender pack may add morei
How this buyer will score bids.
The evaluation criteria and weights exactly as published on the notice, grouped by family (price, quality, social value and so on).
Lots publish different evaluation splits; there is no single procedure weighting.
| Lot | Quality | Price | Split |
|---|---|---|---|
| 1 · Outer Box | 69% | 31% | |
| 2 · MSSS - Skip | 69% | 31% | |
| 3 · Box & Skip Lids | 69% | 31% | |
| 4 · TEST PURPOSES ONLY | — | 100% |
- Price carries 31–100 points depending on the lot; most lots put it at 31 points.
Price arithmetic assumes straight proportional scoring; the tender pack may use another formula.
Procedure terms & legal framework
From the official record- Procedure method
- Competitive flexible procedure
- Legal basis
- UKPGA · 2023/54 Procurement Act 2023
- Procurement category
- Goods
- Notice status
- Closed
- Procurement threshold
- Above threshold (FTS publication)
- Regulatory regime
- Standard
- Commercial structure
- Stand-alone contract (no framework)
- Competition type
- Competitive procedure
- GPA / WTO covered
- Yes (GPA)
- Recurring procurement
- Unspecified in notice
- First published
- 27 Jun 2025, 11:38 BST
- Last source update
- 8 Jul 2026, 12:13 BST
- Award evaluation window
- Submission end – 23 Jun 2027
- Authority reference
C26453 (Atamis Reference)- FTS notice number
2026/S 000-047818- Latest notice
- Tender notice (UK4)
- Classification (CPV)
- Delivery area
- Official registry OCID
ocds-h6vhtk-0554ecFind a Tender- Contract terms summary
Contained within tender conditions (found in folder Appendix 8 Terms and Conditions)
- How it runs
The Procurement will be conducted in accordance with the Procurement Act 2023 and will consist of a 2 Stage Process:
Stage 1. PSQ - Conditions of Participation:
This stage consists of a combination of pass/fail and scored questions. There will be a maximum of 6 suppliers per lot who will be invited to participate in the ITT stage.
Stage 2. ITT:
This stage is for those who are invited to tender following being down-selected to 1 of the 6 successful suppliers per lot. This stage contains a combination of technical and commercial scored question.
For further details on the procurement process, please see Section 3 in the ITT Template CFP Document.
- Risks
The safe retrieval and storage of Intermediate Level Waste (ILW) from the Magnox Swarf Storage Silo, one of the highest hazard facilities on the NDA estate, relies on bespoke 3m3 ILW boxes and their skips, which are integrated with existing legacy site infrastructure and designed to meet stringent safety, storage, transport and final disposal requirements. In previous contracts for the supply of 3m3 boxes, the difficulty of the required design materialised during, and jeopardised the performance of, those contracts. All Lot contracts in this Procurement will embed a New Product Introduction process which enables a phased approach to design and manufacturing in an attempt to address this known risk. However, this known risk could still jeopardise the performance of the contract and necessitate modifications to the Lot contracts.
How it was run
Official notice- Requests to participate (first stage)
- 15 Jul 2026, 12:00 BST
- Submission deadline
- 15 Jul 2026, 12:00 BST
- Clarification deadline
- 26 Jun 2026, 12:00 BST
- Submission channel
- Official e-sourcing portal
- Electronic submission
- Allowed
- Accepted languages
- en
All interested suppliers should register against Atamis Project C26453 where they will be able to access all the tender documentation, submit clarifications and submit their tender response.
Timeline
27 Jun 2025 → 26 Jul 2027 · 9 dates- Planning notice published27 Jun 2025, 11:38 BST
- Market engagement197 days ago10 Apr 2026, 23:59 BST
A webinar is now available to view on Atamis (Ref: C26453) for the upcoming MSSS (Magnox Swarf Storage Silo) Boxes Procurement. The general themes of the webinar include:
MSSS 3m3 Box Overview
Procurement Strategy
Terms & Conditions
Quality Requirements
Social Impact
Tendering Hints & Tips
There have been several other documents and drawings issued alongside the webinar.
Further to this, it is anticipated that the Terms and Conditions will be added to Atamis on Tuesday 7th April.
Please take the time to review all of the information provided and if you have any questions, please ensure they are submitted by COP Friday 17th April.
All questions will be collectively responded to prior to the tender being issued.
Suppliers interested in this webinar should register interest in Atamis reference C26453.
- Next notice expected177 days ago30 Apr 2026, 23:59 BST
- Tender notice published156 days ago22 May 2026, 12:52 BST
- Clarification questions by121 days ago26 Jun 2026, 12:00 BST
- Latest notice published109 days ago8 Jul 2026, 12:13 BST
- Submission deadline102 days ago15 Jul 2026, 12:00 BST
- Today25 Oct 2026
- Award decision expected byin 242 days23 Jun 2027, 23:59 BST
- Contract startsin 274 days26 Jul 2027, 00:00 BST
Notice history
12 events · 9 releases on Find a Tender · since 27 Jun 2025- Pipeline notice published27 Jun 2025, 11:38 BSTUK1
- Preliminary market engagement notice published27 Jun 2025, 14:56 BSTUK2
- Preliminary market engagement notice published15 Jan 2026, 09:07 GMTUK2
- Preliminary market engagement notice published1 Apr 2026, 15:49 BSTUK2
- Preliminary market engagement notice published9 Apr 2026, 15:28 BSTUK2
- Tender notice published22 May 2026, 12:52 BSTUK4
- Published value updated to £90,000,00022 May 2026, 12:52 BSTwas £95,000,000
- Status changed to active22 May 2026, 12:52 BST
- Procurement method changed22 May 2026, 12:52 BST
- Tender notice published4 Jun 2026, 09:00 BSTUK4
- Tender notice published7 Jul 2026, 09:23 BSTUK4
- Tender notice published8 Jul 2026, 12:13 BSTUK4
Published amendments (4)
The date for questions has been extended to the 17th April.
Deadline for clarifications and submissions extended by 1 week per the below: Clarifications: 29/6/2026 12noon Submissions: 10/07/2026 12noon
The submission deadline for this opportunity has been updated to noon on Monday 13th of July to allow sufficient time to review the clarification responses issued 06/07/2026.
The submission deadline for this opportunity has been extended to noon 15th July.
Routine re-releases (9)
- 2026-05: 1 release · 22 May 2026
- 2026-04: 2 releases · 1 Apr 2026, 9 Apr 2026
- 2026-01: 1 release · 15 Jan 2026
- 2025-06: 2 releases · 27 Jun 2025, 27 Jun 2025
Contracting authority & participating public bodies
Official documents & specifications (9)
Official links; attachments are not copiedNotices published for this procedure
- Tender notice Tender notice on Find a Tender
- Tender notice Tender notice on Find a Tender
- Tender notice Tender notice on Find a Tender
- Tender notice Tender notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Preliminary market engagement notice Preliminary market engagement notice on Find a Tender
- Pipeline notice Pipeline notice on Find a Tender