Attribute measurement techniques for confirmation of declared irradiated fuel inventories at nuclear installations under safeguards surveillance are being investigated. High-gain measurements of the intensity of the Cerenkov glow from exposed assemblies in water-filled storage ponds are promising for this purpose. Such measurements have been made of Materials Testing Reactor plate-type fuel assemblies and Pressurized Water Reactor pin-type fuel assemblies. The measured intensities depend on cooling times as calculations predict. *Such was our experience in interpreting results of thermoluminescent dosimeter (TLD) measurements of the Omega West Reactor fuel elements made at the same time as the Cerenkov measurements. TLD results will be included in a separate report.
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