Instrumentation and Monitoring

The scope of works for this package includes:

• Supply, installation, and commissioning of ground and ground-water monitoring instrumentation systems

• Data acquisition and telemetry for transmission to a Client owned database and visualisation platform (This package of work does not include provision of the database)

• All instrumentation is expected to be battery or solar powered

• Compliance with relevant industry standards and regulatory requirements

• Joint Ventures/Alliances will be considered

Packages of work area as follows:

InSAR Satellite

• Provision of historical data to cover the area of Sizewell B and Sizewell C.

• Provision of multi-directional coverage and analysis of the Sizewell B and Sizewell C area until 2036 (period maybe extended).

Unit 1 and 2 Plastic Wall Monitoring

• Commence September 2026, end June 2027

• Drilling of approx. 200nr installation boreholes to a depth of 55m below ground level

• Installation of IPI, IPIX, VWP and GNSS positional location monitoring

Unit 1 and 2 Retaining Walls

• Commence September 2026, end January 2028.

• Installation in void formers at 200nr locations

• Installation of IPI, IPIX, strain gauges and GNSS positional location monitoring

Shafts and Tunnels

• Commence May 2027, end December 2027.

• Installation in void formers at 50nr locations

• Installation of IPI, IPIX, strain gauges and GNSS positional location monitoring

Backfill Specification

• Commence September 2027, end January 2029.

• Installation under main nuclear islands

• Installation of horizontal Inclinometers/SAA, hydraulic settlement cells and extensometers

Provision of Maintenance Team

• Commence September 2026, end December 2036 (maybe extended.

• Provision of maintenance services to ensure operation of installed instrumentation, maintaining solar and battery powered equipment.

• Undertaking manual monitoring where necessary