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Warehouse facilities: • The large amount of materials and consumables that will be required to support installation of the SGRs can easily overburden the utility sites’ normal receiving and warehouse facilities. For this reason, consideration should be given to construction of an alternative receiving and warehouse facility specifically in support of the SGR project. Craft assembly facilities: • At the peak of the SGR project, 500–800 craft personnel can be on-site. Facilities to support briefing areas, break rooms, radiation protection dosimetry and containment dress out and undress areas will need to be provided.
Thermal cutting is quicker, but should preferentially be considered only for the waste parts of the pipe, with special precautions taken to prevent burnt material falling into the existing piping. Nevertheless, in the case of piping reuse after thermal cutting, the heat affected zone has to be eliminated. It is necessary to: • Adapt the design of the edge profiles (including bevels) to the SG nozzle thicknesses. This profile will also be adapted for post-replacement NDE and ISI. • Machine the nozzles and pipe ends according to the designed profile and the recorded topometry.
Pre-cutting of the reactor coolant piping. 31 FIG. 17. Narrow gap weld versus conventional weld. The main activities with regard to radiation during SGR are: • • • • • • • • • • • Construction of scaffolding next to the primary loops; Removal of thermal insulation from primary loops and SG; Installation of shielding; Clamping of primary piping to hold it in place; Cutting of primary piping; Decontamination of remaining pipe ends; Machining the new weld lips on the pipe ends; Welding of new SG to pipe ends; General pipe works for auxiliary systems in the loop rooms; Cleaning activities; Health physics.