DEVELOPMENT OF TESTING AND MEASUREMENT METHODS FOR QUALITY CONTROL
A waste package in its final state of conditioning does not lend itself to ready verification of its contents or its performance as a barrier. The only way to obtain important information, such the leach rate of the waste form or its chemical composition from direct measurements would involve destruction testing. In the concept of Total Quality Assurance, the critical data of waste packages are established by + qualification tests prior to production, + comprehensive monitoring and evaluation of the conditioning process including tests on samples from the production line; + non destructive testing on complete packages; + exceptional or occasional destructive testing of waste packages. As an example for process control of cemented wastes the torque - time characteristics during mixing can show that the cement was added at the correct rate and the evolution of electrical impedance can provide useful information on the curing of the cement. Under the second EC programme a comparative test was carried out to evaluate the accuracy, sensitivity and reproducibility of a leach test on high level waste glasses. A similar exercise was carried out to compare different plutonium assaying techniques for solid alpha bearing wastes. Another method under development is the in-drum scanning of immobilized waste forms by tomography which will show cracks, phase changes and other heterogeneities.
Bibliographic Reference: INTERNATIONAL SEMINAR ON RADIOACTIVE WASTE PRODUCTS, JUELICH (GERMANY) WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32228 ORA
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Record Number: 1989123089500 / Last updated on: 1987-01-01
Available languages: en