BEPPS2

Infrastructure and Construction

Record date: 31 March 2026

Whole-life cost: £727.6m
Published schedule: 01/11/2017 – 30/06/2035
NISTA delivery confidence: Not disclosed
Senior responsible owner: Kathryn McCloghrie

What the project is for

The Box Encapsulation Plant Product Store 2 (BEPPS2) is a critical enabler for Sellafield Ltd to allow continued high hazard retrieval operations from Magnox Swarf Storage Silo (MSSS) and Pile Fuel Cladding Silo (PFCS). The BEPPS2 project will provide the capacity to store circa 7500 packages of legacy Intermediate Level Waste (ILW), safely and securely in a modern facility for long term interim storage.

Departmental delivery commentary

Compared to financial year 24/25 Q4, the NISTA/SRO Delivery Confidence Assessment (DCA) rating at 25/26 Q4 decreased to Amber. This is primarily due to the following factors: Although target design maturity has been achieved, and good progress continues in bulk excavation and preparation for construction on the site, placement of the civil substructure sub-contract is ongoing. Timely release of the sanction held against the Outline Business Case (OBC) is essential to avoid delay to future key commitments required to progress project delivery and impact to the critical path. A prudent assessment of Amber recognises the potential to impact future key commitments required to progress project delivery. The rating is expected to return to Green once the sanction is released.

Schedule

Compared to financial year 24/25-Q4, the project's end-date at 25/26-Q4 remained the same at 30/06/2035.

Cost

The increase to the project's departmentally agreed Whole Life Cost at 25/26-Q4 is primarily due to: Annual Indexation, in line with the agreed indices.

Benefits

There are no monetised benefits within the BEPPS2 project however, it will contribute towards NDA’s strategic outcome 33: All Intermediate Level Waste in interim storage. The project does this by providing additional storage on the Sellafield site.