Measurement campaign on the JRC Ispra decommissioning site

Abstract

The purpose of this document is to describe the measurement campaign with the Free Release Measurement Facility (FRMF) at building 41m “Interim Storage Facility” (ISF) of material clearable according to existing licenses as part of the collaborative research project MetroDecom. The description of the measurement campaign includes the technical requirements and safety implementations necessary for carrying out this project. The Free Release Measurement Facility (FRMF) was designed as a state of the art facility for measurement of low gamma-ray activity waste packages. Gamma spectrometric method for free release measurment was developed. The complemented with passive neutron counting method. The both methods are used for different nuclide contents in the waste and are complementary. For this purpose the instrument incorporates: — Three passive neutron counters (design of JRC) — A gamma-ray detection system HPGe Interchangeable Detector Module IDM-200-V (ORTEC) — NuDET Plastic Scintillation Detectors (design of NUVIA) Decommissioning unit delivered seventy containers with material clearable according to existing JRC licenses. JRC G.II.7 performed the testing of the free release measurement system. The document contains the overview of that measurement campaign. The detailed measurement protocols, spectra generated by FRMF software are shared with MetroDecom Partners.