  The EUSO (Extreme Universe Space Observatory) project is developing a new
mission concept for the scientific research of Ultra High Energy Cosmic Rays
(UHECRs) from space. The EUSO wide-field telescope will look down from space
onto the Earth night sky to detect UV photons emitted from air showers
generated by UHECRs in our atmosphere. In this article we concentrate on the
mitigation strategies agreed so far, and in particular on the implementation of
a careful early selection and testing of subsystem materials (including
optics), design and interfaces of the subsystem and an optimization of the
instrument operational concept.
