scope:

This part of ISO 18213 presents statistical procedures that can be applied to tank calibration and volume measurement data for nuclear materials accountancy tanks. In particular, this part of ISO 18213 presents a) several diagnostic plots that can be used to evaluate and compare tank calibration data; b) a procedure for estimating the uncertainties of tank calibration measurements (i.e., determinations of height and volume); c) a model for estimating either a tank's calibration equation or its inverse (the measurement equation), together with related uncertainties, from a set of standardized tank calibration data (i.e., from a series of standardized height-volume determinations); d) a method for computing uncertainty estimates for determinations of liquid volume.