Source: https://tendernation.io/opportunities/01a13bdf-51af-70ed-8255-3b9ad95eb0f9/3m3-box-design-optimisation-and-development awarded GB direct award procedure # 3m³ Box Design Optimisation and Development [Sellafield Limited](https://tendernation.io/buyers/sellafield-limited) Estimated value Not stated Published 17 Jun 2026 Deadline Rolling deadline ## About this tender The contract covers engineering development, testing and validation activities to support the ongoing optimisation of the existing 3m³ box design currently utilised within the live manufacturing environment, including: - Development and validation of methods to support refurbishment and reuse activities - Design and testing of enhanced base configurations to support long term performance - Development of an alternative reduced height bund configuration to improve operability and process efficiency - Testing and verification of proposed improvements - Preparation of supporting manufacturing instructions and technical documentation to enable controlled implementation This activity relates solely to the existing production design and supports ongoing product and process optimisation within the live manufacturing environment. Source Find a Tender (UK) · Notice ocds-h6vhtk-06a316-2026-06-17T09:21:17+01:00 [View official notice](https://www.find-tender.service.gov.uk/Notice/ocds-h6vhtk-06a316-2026-06-17T09:21:17+01:00) Never miss a tender like this again Get AI summaries, deadline alerts and a bid pipeline for tenders matched to your business. Free to start. [Track tenders free](https://tendernation.io/register) [Buyer profile Sellafield Limited: past awards and live tenders](https://tendernation.io/buyers/sellafield-limited) ## More tenders like this [Invitation to Tender Window Cleaning Services - Wirral · Wirral Community Health and Care NHS Foundation Trust · 33 days left · 20 Nov 2026](https://tendernation.io/opportunities/01a1539a-cf1d-702b-9ffd-93cfa91d3c7c/invitation-to-tender-window-cleaning-services-wirral) [Boiler chemical and Softener Services · Maidstone and Tunbridge Wells NHS Trust · 29 days left · 16 Nov 2026](https://tendernation.io/opportunities/01a1539a-d092-736b-88d2-6bdc251cddb6/boiler-chemical-and-softener-services) [Supply of Timberwolf fixed track woodchipper TW 280 FTR and for Williams trailer TT3017 · Natural England · 19 days left · 6 Nov 2026](https://tendernation.io/opportunities/01a1539a-d25f-7042-8204-c91978cd4253/supply-of-timberwolf-fixed-track-woodchipper-tw-280-ftr-and-for-williams-trailer) [Home Transition Bed Service - Winter Pressures · North Tyneside Borough Council · 4 days left · 23 Oct 2026](https://tendernation.io/opportunities/01a15107-78f4-739e-9d89-50d65f165d99/home-transition-bed-service-winter-pressures) [RRE-01284 - For the provision of a Digitally Enabled Children & Young People's Mental Health Service (South Staffordshire) · Midlands Partnership Foundation Trust · 15 days left · 3 Nov 2026](https://tendernation.io/opportunities/01a150b5-126d-71a0-9217-fa9167c1e352/rre-01284-for-the-provision-of-a-digitally-enabled-children-young-peoples-m) [Gardening and Landscaping Contract · Wickersley Parish Council · 33 days left · 20 Nov 2026](https://tendernation.io/opportunities/01a14ee2-22ea-7053-bd7d-4e4c0fa22e9d/gardening-and-landscaping-contract)