[en] A positive on-site verification technique of spent PWR fuel rods in pool at PIEF and a program for MUF evaluation in bulk material handling facility were developed in support of facility operation and IAEA verification activity. When spent fuel was measured by gamma-ray spectrometry the measured intensity of Cs-137 662 KeV gamma-ray from the sample was clearly identified against comparing background. By the MCNP code simulations, the flux of 662 KeV gamma-ray in the collimated rod was also different from that from the adjacent one. Base on this fact it is possible to identify spent fuel without having a rod pulled out of assembly in spent pond. This method may be useful as a spent fuel verification tool for both IAEA and facility operator. It may also contribute to the reduction of manpower and operational time. A system for facility MUF evaluation was established to apply it to the bulk material handling facility. With required input data the evaluation program was run to produce final results for evaluation of the soundness of MUF. This program was tested with real input data from CANDU fuel fabrication facility in KAERI. The outcome showed that sigma MUF was not significant to sigma international but MUF was found to be statistically significant as compared to critical value at 95% confidence interval. (Author)