  Linear and nonlinear modelling of Alfv\'enic instabilities, most notably
toroidal Alfv\'en eigenmodes (TAEs), obtained by using the global nonlinear
electromagnetic gyrokinetic model of the code ORB5 are presented for the 15 MA
scenario of the ITER tokamak. Linear simulations show that elliptic Alfv\'en
eigenmodes and odd-parity TAEs are only weakly damped but not excited by alpha
particles, whose drive favours even-parity TAEs. Low mode number TAEs are found
to be global, requiring global treatment. Nonlinearly, even with double the
nominal EP density, single mode simulations lead to saturation with negligible
EP transport however multi-mode simulations predict that with double the
nominal EP density, enhanced saturation and significant EP redistribution will
occur.
