MIRION TECHNOLOGIES (CANBERRA UK) LIMITED

This work package copmrises of the design, manufacture, factory acceptance, site installation and commissioning of two assay systems for new waste treatment facilities that will be constructed over the Dounreay Shaft and Wet Silo. The systems will allow a radionuclide inventory to be produced for waste packages prior to interim storage and final disposal. The proposed methodology for the assay is to deploy two separate measurement techniques, a gamma measurement system to account for fission and activation products and a neutron interrogation system to provide a direct measurement of fissionable isotopes. The system will comprise a chamber built into the roof of the cells and waste containers will be raised into the assay chamber using a hoist mechanism. The system will include: an active/passive neutron interrogation system; High Resolution Gamma-Ray Spectrometry; A Control system with data logging; Waste container hoist/handling system; Shielding and containment, with access for maintenance and calibration; The ability to weigh the waste container. The scope will also include the design, manufacture, factory acceptance, site installation and commissioning of two gamma dector arrays for the detection of high active items during the waste sorting process with the Shaft and Silo facilities.