Statistical tests applied as quality control measures to leaching of nuclear waste glasses and in the evaluation of the leach vessel
Simple statistical tests, such as regression analysis and analysis of variance, have been applied to data obtained from leaching experiments carried out under various conditions of time and temperature. The precision and the accuracy of the overall leaching procedure were evaluated considering the short term within laboratory effects. The data originated from determinations of the mass losses of leached glass specimens and from measurements of the electrical conductivity and the pH of the leachants. The solution conductivity correlates highly with the normalized mass loss; hence it provides a consistency check on the measurements of the latter parameter. The overall relative precision of the leaching test method was found to be 5-12%, including the effects caused by inhomogeneity of the glass specimens. The conditions for the application of the teflon inserts often used in leaching devices have been investigated; a modified cleaning procedure is proposed to ascertain the absence of systematic errors by their repeated utilisation (quality control). The operational limit of 190 C as specified by the Materials Characterization Center, Richland USA, was confirmed experimentally.
Bibliographic Reference: Article: Radioactive Waste Management and the Nuclear Fuel Cycle, Vol. 11 (1988),No. 1, pp. 61-75
Record Number: 198910690 / Last updated on: 1994-12-01
Original language: en
Available languages: en