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An approach for determining reasonable sample sizes of MARSSIM final status surveys in decommissioning of nuclear facilities

机译：确定核设施退役中MARSSIM最终状态调查的合理样本量的方法

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In many countries which adopted a radiological criterion for decommissioning or site release, a Multi Agencies Radiation Survey and Site Investigation Manual methodology has been extensively used as a guide for designing decommissioning surveys, especially a final status survey, in order to demonstrate a decommissioned site's compliance with the radiological criteria. The methodology recommends the use of nonparametric hypothesis testing in a final status survey as a statistical tool in making a decision on whether or not the mean contamination level in a survey unit meets a concentration limit which is derived from the radiological criterion. When designing a final status survey, it is of a great importance to ensure that the hypothesis test of the survey has a sufficient power to release a survey unit in question when it is clean by determining the sample size necessary for achieving the power. For this purpose, the MARSSIM methodology recommends using sample sizes which are 20% greater than statistically necessary for the test. However, this study shows that, the MARSSIM-recommended sample size generally provides a conservatism much larger than necessary. Therefore, it is recommended to determine a reasonable sample size of the final status survey for a survey unit not by just following the recommendation of the MARSSIM but by performing a detailed investigation of the power of the test. This kind of effort is valuable as it could result in saving lots of costs when the determined reasonable sample size is smaller than recommended by the MARSSIM methodology. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在许多采用退役或站点释放的放射学标准的国家中，《多机构辐射调查和站点调查手册》的方法被广泛用作设计退役调查（尤其是最终状态调查）的指南，以证明退役站点的合规性符合放射学标准。该方法建议在最终状态调查中使用非参数假设检验作为统计工具，以决定调查单位中的平均污染水平是否符合从放射标准得出的浓度极限。在设计最终状态调查时，非常重要的一点是，通过确定实现此假设所需的样本数量，确保调查的假设检验具有足够的能力在干净的情况下释放所涉及的调查单元。为此，MARSSIM方法建议使用的样本量要比测试所需的统计数据大20％。但是，这项研究表明，MARSSIM推荐的样本量通常提供的保守性比所需的要大得多。因此，建议您不仅要遵循MARSSIM的建议，还要对测试能力进行详细调查，从而确定调查单位最终状态调查的合理样本量。这种努力非常有价值，因为当确定的合理样本量小于MARSSIM方法所建议的量时，可以节省大量成本。 （C）2019 Elsevier Ltd.保留所有权利。

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