Neutron Damage and Activation

How fusion neutrons degrade materials over time, and how Kronos accounts for it.

Breeder neutron fraction

79.7%

Burner neutron fraction

5.44%

Fusion neutrons displace atoms in structural materials (measured in displacements-per-atom) and can transmute them into radioactive isotopes. This sets component lifetimes and the plant's waste profile. The breeder, being neutron-rich (79.7%), carries most of this load; the burner far less (5.44%).

Kronos screens activation and waste class per component rather than assuming low-activation materials solve the problem for free.