  PIP-II is the Fermilab's flagship project for providing powerful,
high-intensity proton beams to the laboratory's experiments. The heart of
PIP-II is an 800-MeV superconducting linac accelerator. It will be located in a
new tunnel with new service buildings and connected to the present Booster
through a new transfer line. To support the design of civil engineering and
mechanical integration, this paper provides preliminary estimation of radiation
level in the gallery at an operational beam loss limit of 0.1 W/m, by means of
Monte Carlo calculations with FLUKA and MARS15 codes.
