# Alternative Active Effluent Discharge Line Installation Works and Final Design

> Contract award record from UK public-sector procurement sources.

## Key facts

- Public buyer: [Nuclear Restoration Services](/buyers/nuclear-restoration-services/contract-awards)
- Contract winner: Costain Limited
- Award value: £9,458,845
- Tender value: £9,458,845
- Award date: 23 September 2026
- Published: 5 November 2026
- Contract start: 19 October 2026
- Contract end: 9 June 2028
- Stage: awarded
- Procurement category: works
- Notice ID: 21f8629d-c739-4679-bc17-65fd0dbaf55e-920742
- OCID: ocds-b5fd17-faa7bd2f-9a0d-44d5-a61c-5939299f7835

## Description

The Cooling water system at NRS Hunterston B site is no longer required for any cooling function\. Therefore, the intention is to remove the Cooling Water pumps and there is a requirement to provide Alternative Active Effluent Discharge Lines \(AAEDL\) to the sea discharge point\. This contract is for final concept design services and the marine installation of new pipe, valve and other minor works for the AAEDL seaward side, at the Hunterston B Nuclear site\. This is to include: - End of line isolation and backflow protection - Culvert fixings - Pipe fitting and valve repair/replacement/installation - Pressure testing and maintenance strategy - Any required pre-works The Contract has been awarded via Mini-Competition under the NRS Decommissioning and Asbestos Removal \(DAR\) Framework Lot 1 - conventional deplanting, asbestos removal and demolition\.

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## Source

[View the original notice on Contracts Finder](https://www.contractsfinder.service.gov.uk/Notice/21f8629d-c739-4679-bc17-65fd0dbaf55e-920742)