  The erosion and high neutron flux in a fusion power plant results in the need
for frequent remote replacement of the plasma facing components. This is a
complex and time consuming remote handling operation and its duration directly
affects the availability and therefore the commercial viability of the power
plant. A tool is needed to allow the maintenance duration to be determined so
that developments in component design can be assessed in terms of their effect
on the maintenance duration. This allows the correct balance to be drawn
between component cost and performance on the one hand and the remote handling
cost and plant availability on the other.
