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Hepa filter age evaluation and estimate of nominal lifetime in nuclear facilities
Progress in Nuclear Energy ( IF 2.7 ) Pub Date : 2021-07-16 , DOI: 10.1016/j.pnucene.2021.103881
J. Matthew Barnett 1 , Kobe R. Schrank 1 , Mary Bliss 1 , Scott K. Cooley 1
Affiliation  

In 2020, PNNL completed a literature search for high-efficiency particulate air (HEPA) filter age information. HEPA filters are used in many operations to remove particulate matter from effluent exhaust streams. They are thought to degrade over time both during proper storage and during normal operational service; however, the rate at which the filters degrade remains unknown. This brings into question if age is an adequate indicator of HEPA filter performance. Data from six previous reports were obtained from the literature search and combined to create a data set of 1600 operating filters. Filter usage was identified from multiple facilities. The various types of filters (e.g., axial flow, self-contained, and standard 61 × 61 × 28 cm; and both separator and separatorless) reported were constructed to the requirements Section FC (HEPA Filters) or Section FK (Special HEPA Filters) of the American Society of Mechanical Engineers AG-1 code. Filters were presumed to have continuously met the operational criteria and in particular passed both annual efficiency tests and annual differential pressure measurements. The environmental conditions within the exhaust system were also assumed adequate for long-term filter operation. The data, by the nature of the reports, excludes rejected filters from quality assurance evaluations, intake, or installation testing. The collective data set shows over half of were operating past the recommended 10-year Department of Energy (DOE) lifetime. Data was evaluated for age lifetime using a linear trendline, survival function, probability functions, and failure rate; financial impacts were also addressed. This report supports the notion that HEPA filters can operate safely and efficiently under proper maintenance well past the 10-year lifetime established by DOE. Using the results of the four age evaluation approaches, they collectively point to the reasonableness of an operating HEPA filter lifetime of 20 years. The results are not necessarily definitive, but nevertheless, they are promising. The analysis provides reasonable assurance that when implemented using a graded approach with well-defined performance and operational requirements, extending the service life for HEPA filters beyond 10 years is low risk.



中文翻译:

Hepa 过滤器年龄评估和核设施标称寿命估计

2020 年,PNNL 完成了对高效微粒空气 (HEPA) 过滤器年龄信息的文献检索。HEPA 过滤器在许多操作中用于去除废气流中的颗粒物。它们被认为在适当存储和正常运行服务期间会随着时间的推移而降解;然而,过滤器退化的速度仍然未知。这带来了问题,如果年龄是 HEPA 过滤器性能的充分指标。之前六份报告的数据是从文献搜索中获得的,并结合起来创建了一个包含 1600 个操作过滤器的数据集。从多个设施中识别出过滤器的使用情况。各种类型的过滤器(例如,轴流式、自给式和标准 61 × 61 × 28 cm;和分离器和无分离器)根据美国机械工程师协会 AG-1 代码的 FC 部分(HEPA 过滤器)或 FK 部分(特殊 HEPA 过滤器)的要求构建。过滤器被认为一直符合操作标准,特别是通过了年度效率测试和年度压差测量。还假设排气系统内的环境条件足以满足过滤器的长期运行。根据报告的性质,这些数据从质量保证评估、引入或安装测试中排除了被拒绝的过滤器。集体数据集显示,超过一半的运营时间超过了美国能源部 (DOE) 推荐的 10 年寿命。使用线性趋势线、生存函数、概率函数、和失败率;还讨论了财务影响。该报告支持这样一种观点,即 HEPA 过滤器可以在适当维护的情况下安全有效地运行,远远超过 DOE 规定的 10 年使用寿命。使用四种年龄评估方法的结果,他们共同指出运行 HEPA 过滤器寿命为 20 年的合理性。结果不一定是确定的,但尽管如此,它们还是很有希望的。该分析提供了合理的保证,即当使用具有明确定义的性能和操作要求的分级方法实施时,将 HEPA 过滤器的使用寿命延长 10 年以上是低风险。该报告支持这样一种观点,即 HEPA 过滤器可以在适当维护的情况下安全有效地运行,远远超过 DOE 规定的 10 年使用寿命。使用四种年龄评估方法的结果,他们共同指出运行 HEPA 过滤器寿命为 20 年的合理性。结果不一定是确定的,但尽管如此,它们还是很有希望的。该分析提供了合理的保证,即当使用具有明确定义的性能和操作要求的分级方法实施时,将 HEPA 过滤器的使用寿命延长 10 年以上是低风险。该报告支持这样一种观点,即 HEPA 过滤器可以在适当维护的情况下安全有效地运行,远远超过 DOE 规定的 10 年使用寿命。使用四种年龄评估方法的结果,他们共同指出运行 HEPA 过滤器寿命为 20 年的合理性。结果不一定是确定的,但尽管如此,它们还是很有希望的。该分析提供了合理的保证,即当使用具有明确定义的性能和操作要求的分级方法实施时,将 HEPA 过滤器的使用寿命延长 10 年以上是低风险。尽管如此,他们还是很有希望的。该分析提供了合理的保证,即当使用具有明确定义的性能和操作要求的分级方法实施时,将 HEPA 过滤器的使用寿命延长 10 年以上是低风险。尽管如此,他们还是很有希望的。该分析提供了合理的保证,即当使用具有明确定义的性能和操作要求的分级方法实施时,将 HEPA 过滤器的使用寿命延长 10 年以上是低风险。

更新日期:2021-07-18
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