Neutronics measurements concerning with the tritium breeding in a lithium sphere of 120 cm diameter have been carried out using the intense 14 MeV neutron source facility OKTAVIAN, in order to predict reliable nuclear performances of fusion reactor blankets. Experimental results are reported on neutron leakage spectra ranging from 0. 05 to 15 MeV with a time-of-flight technique, in-pile neutron spectra by miniature NE-213 organic scintillation spectrometers and dose rates of **6LiF and **7 LiF TLDs in the sphere. Comparisons of the experiments and transport calculations with the evaluated nuclear data files, ENDF/B-IV and JENDLE-3 PR 1 are described. It is shown that the measured values of neutron spectra are lower than the calculations by 1-D transport code, and the results of in-pile spectra consisted with those of TLD dose.