risked value assessments in excess of us1b, page-3

Risked value I believe is the net present value of the asset adjusted for the risk that it will be successful.

For example... say you had 50% risk of failure, or not meeting expectations then the risked value takes this into account as well.

The unrisked value is the value attributed to a project without taking into account the risks... ie just valuing the asset as if it will be 100% successful.