The Radial Neutron Camera is an ITER diagnostic designed to measure the un-collided 14 MeV and 2.5 MeV
neutrons from deuterium-tritium (DT) and deuterium-deuterium (DD) fusion reactions, through an array of
detectors covering a poloidal plasma section along collimated Lines Of Sight (LOS). It is composed by two fanshaped
collimating structures viewing the plasma radially through vertical slots in the diagnostic shielding
module of ITER Equatorial Port 1: the In-Port RNC, devoted to plasma edge coverage, and the Ex-Port RNC,
devoted to the plasma core coverage. This paper presents an overview of the mechanical design of the Ex-Port
RNC at the Preliminary Design Review (PDR) stage. The Ex-Port RNC is located in the Port Interspace and
consists of a massive shielding structure hosting the detector units and two sets of collimators lying on different
toroidal planes. The Ex-Port RNC design is presented both from the point of view of functional requirements (e.g.
LOS positions and angles, radiation shielding, weight limitations) and of manufacturability. Finally, the Ex-port
RNC structural integrity is assessed, and its design validated against the main loads and load combinations.
