Design of a Devoted $gamma$ Spectrometry Device for Axial and Azimuthal Activity Measurements on JHR-Type Curved Fuel Plates

摘要

The AMMON experimental program in the Cadarache EOLE zero power reactor is devoted to the experimental validation of the HORUS-3D neutron and photon calculation scheme for the future Jules Horowitz Material Testing Reactor. Several experimental core configurations have been investigated, based on the same lattice global geometry: a central hexagonal aluminum box, with 7 JHR fuel elements, surrounded by a driver zone composed of standard PWR-${rm UO}_2$ fuel pins. For experimental purposes, one assembly can be fully disassembled to enable precise measurements of local fission rates in the plates. Within this framework, a dedicated $gamma$ -spectrometry device has been designed to precisely measure axial and azimuthal fission rate distributions on these special fuel elements. The present paper details design studies on this bench; experimental results are given for three studied configurations: ara>“Reference” configuration;