Abstract
In this work, the conventional nth group inhour equation is represented in a polynomial form with a degree of n + 1. A general formula for the coefficients of such polynomial is derived. Those coefficients have linear dependence on the inserted reactivity. The related constants of this linear dependence (the abc-values) are calculated and have universal values for different types of nuclear reactors. A qualitative graph representing the new form of the inhour equation is presented for positive and negative insertions of reactivity.