ISO 18213-3:2009介绍了可应用于核材料核算储罐的储罐校准和容积测量数据的统计程序。特别是，ISO 18213-3:2009给出了几种可用于评估和比较储罐校准数据的诊断图；估算储罐校准测量不确定度的程序（即高度和体积的测定）；从一组标准化储罐校准数据（即，从一系列标准化高度-体积测定值）估算储罐校准方程或其逆方程（测量方程）以及相关不确定性的模型；以及计算液体体积测定的不确定度估计的方法。 ISO 18213中的方法- 3:2009应在ISO 18213其他部分的上下文中使用。具体而言，ISO 18213-3:2009中介绍的方法是根据ISO 18213-1中描述的一般方法以及ISO 18213-2、ISO 18213-4、ISO 18213-5或ISO 18213-6中的适当相关算法定制的。尽管ISO 18213-3:2009中的方法专门用于ISO 18213其他部分的应用，但这些方法的适用范围更广。特别是，第5条中提出的用于根据一组标准化校准数据估算储罐测量方程的统计模型可以应用，无论这些数据是否根据ISO 18213的方法获得。方差估计的（传播）方法也有类似的说法: ISO 18213-3:2009中的结果旨在应用于其衍生的特定模型，但这些方法本身适用范围更广。 提出了一个选项，供设施开发等效的工厂或储罐特定统计分析方法，作为ISO 18213-3:2009的替代方法。然而，如果设施采用ISO 18213并选择不开发等效的替代统计分析方法，则有必要使用ISO 18213-3:2009的方法。

ISO 18213-3:2009 presents statistical procedures that can be applied to tank calibration and volume measurement data for nuclear materials accountancy tanks. In particular, ISO 18213-3:2009 presents several diagnostic plots that can be used to evaluate and compare tank calibration data; a procedure for estimating the uncertainties of tank calibration measurements (i.e., determinations of height and volume); 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); and a method for computing uncertainty estimates for determinations of liquid volume. It is intended that the methods in ISO 18213-3:2009 be used within the context of the other parts of ISO 18213. Specifically, the methods presented in ISO 18213-3:2009 are tailored to the general methodology described in ISO 18213-1 and to appropriate related algorithms in ISO 18213-2, ISO 18213-4, ISO 18213-5 or ISO 18213-6. Although the methodology in ISO 18213-3:2009 is intended for application specifically within the context of the other parts of ISO 18213, the methods are more widely applicable. In particular, the statistical model presented in Clause 5 for estimating the tank's measurement equation from a set of standardized calibration data can be applied, regardless of whether or not these data are acquired in accordance with the methods of ISO 18213. A similar statement holds for (propagation) methods of variance estimation: it is intended that the results in ISO 18213-3:2009 be applied to the specific models for which they were derived, but the methods themselves are more widely applicable. An option is presented for a facility to develop equivalent plant- or tank-specific methods of statistical analysis as an alternative to ISO 18213-3:2009. However, if a facility adopts ISO 18213 and chooses not to develop equivalent alternative methods of statistical analysis, it is necessary to use the methods of ISO 18213-3:2009.