The Free Release Measurement Facility (FRMF) based on the 4 HPGe detectors and low-level background concrete shielding and installed in Madrid at Spanish designated metrology institute CIEMAT has been calibrated using Monte Carlo codes MCNP and PENELOPE, and the calibration  validated by measurement of reference materials and radionuclide sources standardized by European metrology institutes. Real… Read More

Members of the NPL’s Nuclear Metrology Group have recently delivered lectures to several different stakeholders from the UK nuclear community. The presentations provided an opportunity to give an update on radioanalytical capabilities and recent method developments in radiochemistry and radionuclide nuclear metrology for nuclear decommissioning and radioactive waste management applications. Two talks were given to… Read More

Aim:  To develop and validate a waste repository acceptance characterisation system for use on site with very low, low and intermediate level radioactive waste. As the legacy waste on nuclear sites needs to be verified for alpha active isotopes and in particular for fissile materials, the system will include gamma scanning and active/passive neutron measurements… Read More

Aim:  To install, test and calibrate on a decommissioning site a facility for pre-selection and free release measurement of wastes from nuclear facilities. The facility will have scintillating detectors for pre-selection of wastes and germanium detectors for free release measurement. The facility will be surrounded by low activity concrete shielding to meet the limits given… Read More

We’re pleased to invite you to the Stakeholder workshop about “In-situ metrology for decommissioning nuclear facilities” to present the outputs and products designed and validated by an European consortium in the areas of: in-situ methods for rapid measuring the radioactivity content of materials on a nuclear site a novel automatic measurement system to check whether… Read More

Aim:  To develop radiochemical strategies for the analysis of radionuclides in materials. Accurate measurement of radioactivity in waste materials has an important role to play in the decommissioning of nuclear sites, as it enables site operators to dispose of waste in compliance with the regulations. The determination of alpha- and beta-particle emitting radionuclides in decommissioning… Read More

Aim:  To develop in-situ methods for the rapid radionuclide characterisation of the different types of materials present on decommissioning sites. The methods will improve the remote mapping of contamination and doses inside nuclear facilities and thus enable the disposition of activity to be determined and characterised, so that decommissioning work can be planned. The performance… Read More

Current methods used for the detection of long-lived radioisotopes are mainly laboratory-based techniques, which cannot provide on-site monitoring capabilities. Optical techniques, such as laser spectroscopy, on the other hand, have inherent on-site monitoring capabilities, as it can provide compact, transportable, and reliable instrumentation, while still achieving very high sensitivity. Cavity ring-down spectroscopy is one of… Read More

Distributed Strain and Temperature Sensors (DSTS) by optical fibres are quite promising methods for the long-term (a few decades typically) structure health monitoring.  As responsible operators, Andra and EDF are evaluating the feasibility to deploy such systems in their respective facilities:  prospective underground radioactive waste repositories in the one hand, and hydraulics facilities (dams, dikes,… Read More