Spent fuel attribute tester.

A portable spent fuel attribute tester (PSFAT) for the verification of WWER type nuclear fuel assemblies was developed by the safeguards group of the Department and it is now in routine use at the Paks power plant. The attribute tester is based on medium resolution gamma spectrometry using a CdZnTe detector. The equipment is primarily designed for distinguishing between low-burnup spent-fuel assemblies, absorbers and Co-containers stored in the spent fuel pond (even in the neighbourhood of other strong gamma-emitting assemblies), without the need to move the assemblies. In this way the attribute tester can help the safeguards inspectors in the situations when Cherenkov viewing devices are not usable. The group has also experience in using high-resolution gamma spectrometry and neutron counting techniques for examining reactor fuel rods.