Reinforced-concrete work

Tender description

Supply approximately 1 250 no 6m3 Robust Concrete Boxes and approximately 150 no Concrete Over-packs. Magnox Limited, on behalf of the members of the NDA Estate Shared Service Alliance (SSA) is putting in place a Pan Government Collaborative Contract for use by the SSA and the following Contracting Bodies and UK Public Sector Bodies (and any future successors to these bodies) Central Government Departments, Executive Agencies and NDPBs. The government departments detailed in the following list that require robust concrete boxes may use this Agreement, which includes ‘The Ministry of Defence and its agencies, trading funds and non-departmental public bodies’ as well as any other UK government department listed in the Office for National Statistics (ONS) Public Sector Classification Guide, which is updated monthly and can be found at the following link: https://www.ons.gov.uk/economy/nationalaccounts/uksectoraccounts/datasets/publicsectorclassificationguide A supply contract for the manufacture and delivery of approximately 1 250 no 6m3 concrete boxes to be supplied to the following Organisations: — Magnox Limited; — Dounreay Site Restoration Limited (DSRL); — Culham Centre for Fusion Energy; — Plus other Public Bodies (see Section II 1.4)) The 6m3 concrete boxes comprise a reinforced concrete box and a reinforced concrete lid. The dimensions of the complete box are approximately 2,4 m x 2,2 m x 2,2 m high with a nominal wall thickness of 240 mm. The density of standard density box is 2 330 kg/m3 and of the higher density box 3 750 kg/m3. The scope includes: — Design optimisation; — Procurement of materials including steel reinforcement bar, twist locks, steel casings, ID Plates and 2 no specified concrete mixes (the concrete mixes will approved by the purchaser). The higher density mix will incorporate magnetite aggregate for additional shielding. — Fabrication of twist-lock assemblies, upper and lower casing's and ID Plates. Assembly of rebar cage; — Design and fabrication of the mould(s); — The manufacture of Standard Density and Higher Density 6 m3 boxes in production batches in accordance with the supplied drawings and specification; — Testing and inspection as required by the specification; — Production of full QA documentation packs for each container produced; — Short and medium term storage (if required); — Delivery to site locations or off-site storage (if required). Evidence from serial manufacturing of an earlier design of this container showed the importance of manufacturing quality management. The demand profile for the use of the boxes on the sites is set out in the RFQ Documents which can be accessed at https://sharedsystems.eu-supply.com/ using the instructions detailed in VI.3) This shows the sites have a demand through to 2028, however the optimum manufacturing schedule will be determined by the supply chain and implemented in agreement with Magnox via the issue of Batch Orders under the Supply Contract. The Supply Contract will be awarded to the tenderer having the highest total score. Magnox Limited reserve the right to award further contracts to additional tenderers who can offer the supply of containers to meet the supply demands outlined the RFQ Documents. Such additional Contracts shall be based on the tenderers ability to meet the demand profile and demonstrate the delivery of best value from the supply chain. Additionally there is a demand to supply between approximately 150 concrete over-packs for use at Trawsfynydd Power Station. The over-packs will be used to cover approved stainless steel 3 m3 boxes or 3 m3 stainless steel drums. The over-pack comprises a reinforced concrete box and a reinforced concrete lid. The dimensions of the complete over-pack are approximately 2,7 m x 2,7 m x 2,2 m high and have an approximate weight of 30 tonnes. The walls and floor are 450 mm thick and the lid is 500 mm deep, based on a concrete density of 2 300 kg/m3. These are planned for manufacture from March 2018. The scope for the Over-packs includes: — Procurement of materials including steel reinforcement bar, twist locks and a specified concrete mix (the concrete mix will approved by the purchaser); — Design and fabrication of the mould(s); — The manufacture of concrete Over-packs in 1 production batches in accordance with the supplied drawings and specification; — Modification to the basic over-pack to install 4 joggle boxes in the over-pack walls and cover the internal surfaces with a high build solvent free polyurethane coating; — Testing and inspection as required by the specification; — Production of full QA documentation packs; — Short and medium term storage (if required); — Delivery to site locations or off-site storage (if required). More detail on the scope can be found in the Request for Information (RFI) document which can be accessed at: https://sharedsystems.eu-supply.com