Estimates of system failure probability during the renewal time for a group of repairable systems

We consider the model described in [1] assuming that lambda(0) = lambda(1) = ... = lambda(n) = lambda(n+1) = ... = lambda. The objective of this paper is to elucidate the relative error in the asymptotic bound of the system failure probability during the renewal time as a function of the load on the repair unit. This problem is of considerable practical interest.