  In a previous article we have introduced an operator representing the
three-dimensional scalar curvature in loop quantum gravity. In this article we
examine the new curvature operator in the setting of quantum-reduced loop
gravity. We derive the explicit form of the curvature operator as an operator
on the Hilbert space of the quantum-reduced model. As a simple practical
example, we study the expectation values of the operator with respect to basis
states of the reduced Hilbert space.
