As the thermal-to-fast neutron ratio for the neutrons at the ENF is very high, the ENF is very useful for the calibration test of neutron detectors.  At present, a performance test is being performed for the AlN(Aluminum Nitrate) in-core detector, which is a candidate for high temperature condition. In addition, a calibration test will be performed for the SPND detectors which is being used for the power reactor.