Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

The Neutron Radiography Reactor at Idaho National Laboratory (INL) has two beamlines extending radially outward from the east and north faces of reactor core. control rod withdrawal procedure recently been altered, potentially changing power distribution thus properties neutron beams, calling for characterization beams. East Station involved experiments used to measure following characteristics: flux, beam uniformity, cadmium ratio, image quality, energy spectrum. ERS is a Category-I radiography facility signifying it highest possible rank station can achieve. thermal equivalent flux was measured using gold foil activation determined be 9.61 × 106 ± 2.47 105 n/cm2-s with relatively uniform profile across plane. ratio measurement performed bare cadmium-covered foils 2.05 2.9%, indicating large epithermal fast content in beam. spectrum coupled unfolding algorithms provided by software package Unfolding MAXED GRAVEL (UMG). Monte-Carlo N-Particle (MCNP6) transport code assist process. UMG, MCNP6, activities were determine which implemented into MCNP6 model contribute future studies.