Ivan Fast Realistic Bandwidth Estimation in the Theoretically Predicted Radionuclide Inventory of PWR-UO2 Spent Fuel Derived from Reactor Design and Operating Data

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Inhaltsangabe zu „Realistic Bandwidth Estimation in the Theoretically Predicted Radionuclide Inventory of PWR-UO2 Spent Fuel Derived from Reactor Design and Operating Data“ von Ivan Fast

Nuclear energy for power generation produces heat-generating high- and intermediate level
radioactive waste (HLWand ILW) for which a safe solution for the handling and disposal has to
be found. Currently, many European countries consider the final disposal of HLW and ILW in
deep geological formations as the most preferable option. In Germany the main stream of HLW
and ILW include spent fuel assemblies from nuclear power plants (NPPs), the vitrified waste
and compacted metallic waste of the fuel assembly structural parts originate from reprocessing
plants. An important task that occurs within the framework of the Product Quality Control
(PQC) of nuclear waste is the assessment of the compliance of any reprocessed waste product
inventory with the prescribed limits for each relevant radionuclide (RN). The PQC task is to
verify the required quality and safety of nuclear waste prior to transportation to a German
repository and to avert the disposal of non-conform waste packages. The verification is usually
based on comparing the declared radionuclide inventory of the waste with the presumed or
expected composition, which is estimated, based on the known history of the waste and its
processing. The difficulty of such estimations for radioactive components from nuclear fuel
assemblies is that reactor design parameters and operating histories can have a significant
influence on the nuclide inventory of any individual fuel assembly. Thus, knowledge of these
parameters is a key issue to determine the realistic concentration ranges, or bandwidths, of
the radionuclide inventory.
As soon as a governmental decision on the construction of a high-level waste repository will
be made, comprehensive radionuclide inventories of the wastes assigned for the deposition will
be required. The list of final repository relevant radionuclide is based on the safety assessment
for this particular repository, thus it is likely to comprise more-or-less the same radionuclides
that need to be declared for compacted metallic waste residual from the reprocessing of spent
fuel assemblies. In Germany, the radionuclide declaration list for the disposal of used fuel
assemblies is not yet specified. Although information of radionuclide composition of used
nuclear fuel assemblies assigned to a specific repository would be provided by the nuclear
industry. An estimation of the average radionuclide composition of the burnt-up fuel including
the realistic inventory bandwidths for each of relevant radionuclides would be highly desirable
beforehand. This information is needed for the development of proof tools for the product
quality control or safeguards, but also for the evaluation of various safety scenarios regarding
the radionuclide mobility or contamination...

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