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AbstractAbstract
[en] The usage of fissile material for nuclear fuel causes that alongside radioactive wastes are produced. These waste materials are created during all handling or usage operations within the nuclear fuel cycle. The main source of radiotoxicity is produced during the usage of nuclear fuel within the reactor. Energy is released by neutron induced fission reactions in heavy isotopes. Parts of the created fission products have large radiotoxicities. Due to neutron capture within the nuclear fuel the radiotoxicity is furthermore increased. These waste streams from the nuclear fuel cycle must be stored in a safe way to prevent any contamination of the biosphere and any harm to the civilization or the environment. The waste packages must be treated and conditioned for the final disposal. These created packages are subject to an independent product control to ensure there acceptability for transport, interim and final storage. The independent product control is a significant component of an effective waste management system. The aim of this work is the development of a software system used for the assessment of radioactive waste packages. The software shall permit the auditor to perform scenario analysis to forecast the product properties of a certain waste stream and therefore optimize the needed inspection scope in preparation of a new campaign. The software is designed as a modular library this permits the most flexible use of the software components and a high reusability of written analysis software. The software system is used for coupling of established and well-known simulation programs used for nuclear systems. The results of Monte-Carlo simulations and burn-up calculations are automatically imported and prepared for user interaction. The usage of simulation programs cause different challenges to the computing infrastructure. The scenario analyses need a large number of parameter variations which are bound to the computing time. For this reason additional to the development of the software system the construction and implementation of a computer cluster was promoted. The design of this system was optimized on the requirements of the simulation programs. This system is used as a platform for future extensions and use cases. To verify the accurateness of the developed software-components several comparative calculations with international benchmarks were performed. The performed calculations and the additional analysis with the created software system show that the results of the benchmarks and the calculations match. These calculations were used to verify the basic quality of the software system. To verify that the software system is capable to be used as a tool for the inspection of radioactive waste products the product properties of the high level glass products from the vitrification plant in Karlsruhe (VEK) were calculated from the available compound documentations. The thermal power as well as the dose-rate for the compounds were calculated using different models. This analysis showed that the calculated and declared product properties are in a good agreement. It was concluded from this benchmark that the created software system is reliable to be used as a tool for the evaluation of radioactive waste products. The software is used for scenario analysis of waste products. This feature is used for the super-compacted metallic waste stream from the reprocessing plants to forcast their product properties. Therefore the basic functionalities of the developed software system were used to create a scenario analysis of the reprocessing plant. This virtual plant contains all necessary processing steps with their material flow and mass balance. The process parameters which affect the material flow were collected from pubic resources. The expected product properties depending on the approved raw waste are valid within the current approved waste product properties. Finally the scenario analysis was extended to test the validity of the current approved product properties for the super-compacted waste stream if the raw waste properties are extended for high burn-up or mixed oxide fuels. These cases are treated separately and discussed in comparison with the current approval of the waste product properties. The approach to implement a software platform for the analysis of radioactive waste products based on top of world-wide accepted and well-known tools was demonstrated in this work. The results of the created software system show that already during the testing phase reliable forecasts about the product properties were achieved. It is assumed that this software system will play a vital role for the product control.
Original Title
Numerische Simulationen von Abfallgebinden aus der Wiederaufarbeitung von Kernbrennstoffen
Primary Subject
Source
Schriften des Forschungszentrums Juelich. Reihe Energie und Umwelt/Energy and Environment; v. 233; 2014; 209 p; ISBN 978-3-89336-998-0;
; ISSN 1866-1793;
; Diss.


Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Report Number
Country of publication
BENCHMARKS, CAPTURE, COMPUTERIZED SIMULATION, DOSE RATES, FUEL CYCLE, HEAT PRODUCTION, NEUTRON REACTIONS, OPTIMIZATION, PACKAGING, RADIOACTIVE WASTE DISPOSAL, RADIOACTIVE WASTE PROCESSING, RADIOACTIVE WASTE STORAGE, RELIABILITY, REPROCESSING, SPENT FUELS, TOXICITY, VALIDATION, VERIFICATION, VITRIFICATION, WASTE FORMS
BARYON REACTIONS, CONVERSION, ENERGY CONVERSION, ENERGY SOURCES, FUELS, HADRON REACTIONS, MANAGEMENT, MATERIALS, NUCLEAR FUELS, NUCLEAR REACTIONS, NUCLEON REACTIONS, PROCESSING, RADIOACTIVE MATERIALS, RADIOACTIVE WASTE MANAGEMENT, RADIOACTIVE WASTES, REACTOR MATERIALS, SEPARATION PROCESSES, SIMULATION, STORAGE, TESTING, WASTE DISPOSAL, WASTE MANAGEMENT, WASTE PROCESSING, WASTE STORAGE, WASTES
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