Abstract The ANSI/HPS N13.1–2011 standard requires gaseous tracer uniformity testing for sampling associated with stacks used in radioactive air emissions. Sulfur hexafluoride (SF6), a greenhouse gas with a high global warming potential, has long been the gas tracer used in such testing. To reduce the impact of gas tracer tests on the environment, nitrous oxide (N2O) was evaluated as a potential replacement to SF6. The physical evaluation included the development of a test plan to record percent coefficient of variance and the percent maximum deviation between the two gases while considering variables such as fan configuration, injection position, and flow rate. Statistical power was calculated to determine how many sample sets were needed, and computational fluid dynamic modeling was utilized to estimate overall mixing in stacks. Results show there are no significant differences between the behaviors of the two gases, and SF6 modeling corroborated N2O test results. Although, in principle, all tracer gases should behave in an identical manner for measuring mixing within a stack, the series of physical tests guided by statistics was performed to demonstrate the equivalence of N2O testing to SF6 testing in the context of stack qualification tests. The results demonstrate that N2O is a viable choice leading to a four times reduction in global warming impacts for future similar compliance driven testing.

中文翻译：

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评估一氧化二氮作为六氟化硫的替代品以减少 ANSI/HPS N13.1 气体均匀性测试对全球变暖的影响

摘要 ANSI/HPS N13.1-2011 标准要求对与放射性空气排放中使用的烟囱相关的采样进行气体示踪剂均匀性测试。六氟化硫 (SF6) 是一种具有高全球变暖潜能值的温室气体，长期以来一直是此类测试中使用的气体示踪剂。为了减少气体示踪剂测试对环境的影响，评估了一氧化二氮 (N2O) 作为 SF6 的潜在替代品。物理评估包括制定测试计划以记录两种气体之间的百分比变异系数和最大偏差百分比，同时考虑风扇配置、喷射位置和流速等变量。计算统计能力以确定需要多少样本组，并利用计算流体动力学模型来估计堆叠中的整体混合。结果表明，两种气体的行为没有显着差异，SF6 建模证实了 N2O 测试结果。尽管原则上所有示踪气体都应该以相同的方式测量烟囱内的混合，但还是进行了以统计为指导的一系列物理测试，以证明 N2O 测试与烟囱鉴定测试中的 SF6 测试等效。结果表明，N2O 是一种可行的选择，可将全球变暖影响减少四倍，用于未来类似的合规驱动测试。进行了一系列以统计为指导的物理测试，以证明 N2O 测试与 SF6 测试在堆栈资格测试中的等效性。结果表明，N2O 是一种可行的选择，可将全球变暖影响减少四倍，用于未来类似的合规驱动测试。进行了一系列以统计为指导的物理测试，以证明 N2O 测试与 SF6 测试在堆栈资格测试中的等效性。结果表明，N2O 是一种可行的选择，可将全球变暖影响减少四倍，用于未来类似的合规驱动测试。