Obiettivo 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 samplesThe 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 leachingThe 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. Campo scientifico engineering and technologyother engineering and technologiesnuclear engineeringnuclear waste managementnatural sciencescomputer and information sciencessoftwareengineering and technologymaterials engineeringnatural sciencesmathematicspure mathematicsgeometry Programma(i) FP2-RADWASTOM 4C - Specific research and technical development programme (Euratom) in the field of management and storage of radioactive waste, 1990-1994 Argomento(i) A.3.4 - Quality control of waste conditioning Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore Bundesanstalt für Materialforschung und Materialprüfung Contributo UE Nessun dato Indirizzo Unter den Eichen 87 12203 Berlin Germania Mostra sulla mappa Costo totale Nessun dato Partecipanti (2) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Commissariat à l'Energie Atomique (CEA) Francia Contributo UE Nessun dato Indirizzo Centre d'Études Nucléaires de la Vallée du Rhône Cité de Marcoule 30205 Bagnols-sur-Cèze Mostra sulla mappa Costo totale Nessun dato TECHNICAL UNIVERSITY OF MUNICH Germania Contributo UE Nessun dato Indirizzo Walther-Meissner-Strasse 3 85748 Garching Mostra sulla mappa Costo totale Nessun dato
