A new spectrometer for measuring nuclear level lifetimes has been installed at the on-line isotope separator of the Kyoto University Reactor. The spectrometer consists of a LaBr(3)(Ce), Ge and a thin plastic scintillation detector, and the lifetimes are determined using a beta-gamma-gamma delayed coincidence technique. In this study, the LaBr3 detector was used to obtain time spectra, whereas the Ge detector was used to select a desired gamma branch. The energy dependence of the time resolutions was measured down to a photon energy of 100 key. The lifetimes measured for the excited levels in (93)Sr and (148)Ce agree well with their evaluated values. The lifetime of 8.5(5) ns was obtained for the first time for the 98.2 key level in (148)Pr. (C) 2011 Elsevier B.V. All rights reserved.