MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) is a flexible experimental lead-bismuth cooled accelerator driven system currently being developed at SCK•CEN. The linear accelerator of MYRRHA will accelerate the protons up to 600 MeV. During routine operation of the accelerator, there will occur beam losses on the beam line structures. The interactions of the primary protons with the structural materials will produce a radiation field combining secondary protons, neutrons, photons, electrons, and other particles (depending on the incident beam energy) along the whole length of the beam line.
Shielding is required in order to protect workers, public, environment and equipment against prompt and delayed radiation. Attenuation of radiation to acceptable levels (below dose rate limit) can be achieved using shielding layers of appropriate materials and thickness. More accurate shielding design is based on calculation codes simulating the particle transport in matter and reliable nuclear data. Experimental shielding benchmark data can be used to improve calculation model and to revise nuclear data for accelerator shielding calculations.