  The In-Vessel Viewing System (IVVS) in ITER consists of six identical units
which are deployed between pulses or during shutdown, to perform visual
examination and metrology of plasma facing components. The system is housed in
dedicated ports at B1 level, with deployment at the level between the divertor
cassettes and the lowermost outboard blanket modules. Boron carbide shielding
blocks are envisaged to protect the sensitive components of the IVVS from
damage during operations, and personnel from radiation fields. In order to
progress the design of the IVVS beyond the pre-conceptual stage, analyses were
conducted using MCNP to determine the acceptability of a series of different
shielding configurations.
