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Published on: May 20, 2019
Verification of 235U enrichment of fresh VVER-440 fuel assemblies
I Almási1, C T Nguyen, J Zsigrai
1Institute of Isotopes, Hungarian Academy of Sciences, 1525 Budapest, Hungary.
Abstract:
Enrichment of uniformly and non-uniformly enriched ("profiled") fuel assemblies in a range of 1.6-4.4% was verified by gamma-ray spectrometry at a nuclear power plant (NPP). HPGe detectors and a CdZnTe (CZT) detector, the latter fitting into the central tube of the assemblies, were used for obtaining information from outer and inner fuel rods. A procedure which has minimal impact on the NPP work was developed for verifying freshly arrived assemblies under normal operational conditions, and is now in routine use.
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