  Part-3 of "Project X: Accelerator Reference Design, Physics Opportunities,
Broader Impacts". The proposed Project X proton accelerator at Fermilab, with
multi-MW beam power and highly versatile beam formatting, will be a unique
world-class facility to explore particle physics at the intensity frontier.
Concurrently, however, it can also facilitate important scientific research
beyond traditional particle physics and provide unprecedented opportunities in
applications to problems of great national importance in the nuclear energy and
security sector. Part 1 is available as arXiv:1306.5022 [physics.acc-ph] and
Part 2 is available as arXiv:1306.5009 [hep-ex].
