  We predict that plutonium hexaboride (PuB6) is a strongly correlated
topological insulator, with Pu in an intermediate valence state of Pu^2.7+ .
Within the combination of dynamical mean field theory and density functional
theory, we show that PuB6 is an insulator in the bulk, with non-trivial Z2
topological invariants. Its metallic surface states have large Fermi pocket at
X Dirac cones inside the bulk derived electronic states causing a large surface
thermal conductivity. PuB6 has also a very high melting temperature therefore
it has ideal solid state properties for a nuclear fuel material.
