The Nuclear Data Production System (NDPS) was constructed at Rare Isotope Accelerator complex for ON-line experiments (RAON) to produce nuclear data for neutron-induced reactions at a few tens of MeV. For the neutron time-of-flight measurement, various neutron detectors, such as gas-filled Parallel Plate Avalanche Counter (PPAC), MICRO-MEsh-GASeous (MICROMEGAS), and EJ-301 liquid scintillation detectors, were installed in the NDPS neutron beamline. The NDPS recently performed its first beam commissioning with 16 MeV/nucleon 40Ar ion beams. For the measurement of the neutron beam, EJ-301 liquid scintillation detectors and activation foils (natAl, natFe, natZr, natAu, natBi, etc) were used to measure the neutrons from the graphite target. In this presentation, we report a detailed description of the NDPS neutron detection system with its current status.