In most participating countries in this EC 5thFramework project the problem of how to perform a QA/QC characterization of large volume waste packages has been recognized as one of the new arising radioactive waste problems. The aims of this project are the development and validation of non-destructive QA/QC procedures and methodologies for an independent QA/QC characterization of the fissile and non-fissile content of large volume waste packages. The R&D on the development of suitable nuclear non-destructive techniques and procedures to control and characterise fissile material (actinides) was focused on neutron detection following neutron and photon interrogation by using a mobile and a immovable electron linear accelerator (Linac). To assay the non-fissile content of large volume wastes two measuring devices have been designed. The results achieved by the Point-to-Point-system (FTP) and the 3 Dimension-Automatic-Scanning-system (3DAS) by the NDA characterization of a heat-exchanger were in good agreement. This is also valid for the activity of the iso-container loaded with seventy 220 litres waste drums. The results were verified by Olkiluoto NPP and Waste Quality Checking Laboratory of the United Kingdom (WQCL). The above experiences have lead to the set-up of a general guideline for assaying the non-fissile content of large volume waste packages. A multi-energy transmission model, based on the output of a Linac, has been developed, tested and improved by artificial data provided by MCNP-calculations. Results showed that with the improved model the differences between hydrogen mass fractions could be calculated within 10 %, however not the true values of the hydrogen mass fractions. Experiments were performed with a fixed Linac at different maximum energies to investigate in more detail. In conclusion, more research needs to be performed on this topic before a working method for the matrix characterization of large volume waste packages can be established. Based on the results of the NDA QA/QC characterization for non-fissile material in large volume wastes a guideline has been established. For setting up such a guideline for fissile material (actinides) to be applied in routine more R&D has to be performed. Copyright © 2005 by ASME.
|Publication status||Published - 2005|
|Event||10th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'05 - , United Kingdom|
Duration: 1 Jan 2005 → …
|Conference||10th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'05|
|Period||1/1/05 → …|
All Science Journal Classification (ASJC) codes
Van Velzen, L. P. M., Tiitta, A., Lyoussi, A., Strange, R., Kekki, T., Dodaro, A., ... May, R. (2005). Development of NDA procedures for the QA/QC characterization of large volume radioactive waste packages. Paper presented at 10th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'05, United Kingdom.