Sealing Deep Site Investigation Boreholes - Phase 5
CTM Portal for the NDA Shared Services Alliance · United Kingdom
Key facts
- Estimated value
- £9,500,001
- Closing date
- 02 Aug 2021
- Contract starts
- 01 Dec 2021
- Contract ends
- 30 Nov 2026
- Procedure
- Other -
- Buyer type
- Other public body
Description
RWM's working model for the proposed procurement strategy is for a single contract award with a suitably qualified contractor to deliver Phase 5. This strategy may change based upon the outcome of this market engagement and further development of the procurement strategy. The contract will be for a period of 5 years with an option to extend this for a further 2 years.
A DRAFT Contract Technical Specification and Questionnaire can be accessed by registering on the RWM procurement tendering system here: Sellafield Ltd (eu-supply.com) For background on the borehole sealing project, please see http://rwm.nda.gov.uk/publication/sealing-deep-site-investigation-boreholes-phase-1-report-rwmd03042/ (Phase 1 output) and http://rwm.nda.gov.uk/publication/sealing-deep-site-investigation-boreholes-phase-2-final-report/ (Phase 2 output). Activities to be included in Phase 5 will consider 'small-scale' laboratory work on materials such as bentonite, 'large-scale' laboratory work (e.g. using 20m mock-up boreholes), natural analogues (currently progressing via a series of international collaborative projects), a continuation of work on bridge plugs (a collaboration between RWM and two international waste management organisations), field demonstrations in pre-existing boreholes up to 2km deep and in underground research laboratories.
No borehole drilling will be undertaken. However, preparing a borehole for sealing may require rehabilitation, removal of abandoned in-hole equipment, milling and under-reaming of a window in borehole casing, etc. - access to coiled tubing and drill string technology is anticipated. Bentonite has already been chosen as the seal material for use in boreholes in lower strength sedimentary rocks and higher strength rocks. Bentonite will be emplaced in boreholes in Phase 5 via use of the Downhole Placement System, a tool has been developed for this project. A different approach can be followed for a borehole penetrating an evaporite layer in Phase 5.
Categories (CPV)
- 38200000 Geological and geophysical instruments
- 45000000 Construction work
- 45100000 Site preparation work
- 45120000 Test drilling and boring work
- 71000000 Architectural, construction, engineering and inspection services
- 71300000 Engineering services
- 71310000 Consultative engineering and construction services
- 71330000 Miscellaneous engineering services
- 71332000 Geotechnical engineering services
- 71351220 Geological consultancy services
- 71510000 Site-investigation services
- 71520000 Construction supervision services
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