Objective
Part of this contract is the development of a new data acquisition programme for a digital radiographs system which fulfils the following conditions :
- Measuring time lower than 10 min for a 200 l drum
- Correct geometrical projection and intensity calibration, probably by software correction
- Wide energy range (400 kV X-ray, Co-60, LINAC-12 MeV)
The objective of the CEN-VALRHO work is the improved quality assurance of vitrified HLW packages. The goal is to qualify and quantify the defects present in vitrified waste package by a tomographic method.
The objective of the work at TUM is to gain knowledge in taking representative samples within a quality control of low level waste containers using non-destructive and destructive testing procedures.
The radiometric methods to be applied to the nondestructive examination of nuclear waste packages are computerized tomography (CT), digital radiography (DR), and microtomography (MCT). Computerized tomography (CT) offers the possiblity of getting information about the internal structure of waste containers. In many cases it is sufficent to make CT measurements on selected parts of a package. Therefore a fast method to get a survey image of the total package is very useful. The disadvantage is that with a one detector system the measuring time is much higher than for a CT measurement. DR with a CT multidetector system gives a distortion of the geometry of the object. Part of this contract is the development of a new data acquisition programme which has a measuring time lower than 10 minutes for a 200 litre drum, the correct geothermal projection and intensity calibration, probably by software correction, and a wide energy range. The overall goal is the development of a new, non-destructive tomographic examination method.
The first version of a scanning programme for digital radiography (DR) with a multidetector system has been written and is in the test phase now.
The programme builds a shadowgraph from the attenuation profiles measured by a computer tomograph with a multidetector array.
Work programme:
The non-destructive investigation work of BAM focuses on three groups of waste subjects: drums, glass canisters, and waste samples.
The work programme comprises the following topics:
- CT investigation of real LLW and MLW packages
- Study of fissuration of HLW glass blocks and evaluation of crack length and geometry by image processing
- Study of representative sampling procedures
- Micro-computerized tomography of core samples
The work programme of CEN-VALRHO has the following topics:
- fabrication of non-radioactive glass blocks
- definition of the tomographic examination procedure and the detection limits
- definition of the image analysis procedure using a "Pericolor" system, measurement of the length of the cracks on the images and estimation of the total internal surface to calculate the fracturation ratio
- quantification of the molybdic phase percentage
- experimental validation of the tomographic interpretation by leaching
The contribution of the Institut für Radiochemie, Technische Universität München (TUM), consists of the selection of four 200 l drums with different categories of low level radioactive waste as they are produced in nuclear power plants or nuclear research centres, the use of computerized transmission tomography (TCT) for providing reliable information about the internal structure and composition of these waste containers, the application of destructive sampling techniques to two selected drums followed by preparation procedures suitable for subsequent chemical and radiochemical analyses, and the derivation of rules for representative sampling on the basis of the collected tomographic information.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology other engineering and technologies nuclear engineering nuclear waste management
- natural sciences computer and information sciences software
- engineering and technology materials engineering amorphous solids
- natural sciences mathematics pure mathematics geometry
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Coordinator
12203 Berlin
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.