ISO 17918:2015规定了现场检测和评估程序，以确定材料劣化的影响，如工业设施（包括核电厂）中对选择性腐蚀敏感的部件和结构的材料损失。 该方法包括目视检查和现场硬度测量，并辅以样品去除。这些程序分别包括（a）对选择性腐蚀敏感的部件进行代表性取样，（b）目视检查和（c）硬度试验。为了进行精确分析，建议进行额外的实验室测试。 该方法最适用于锌含量超过15%的灰铸铁和铜合金。扩展到其他合金需要验证的支持性证据。 在延长运行结束前的过去五年中，针对核电厂应用的评估标准定义了进一步工程评估和行动的必要性，例如进一步取样、更高的检查频率和部件维修或更换。 本规范不适用于接触流体表面的代表性取样无法通过光学检测或便携式硬度计检测的部件。此外，如果在暖通空调或建筑服务应用中选择非代表性部件，本规范不适用。对于未在核电厂中使用的部件，评估标准必须得到各方的同意。仅硬度试验的评估标准不适用于评估铝青铜、NAB和Cu-Ni的结构完整性。

ISO 17918:2015 specifies procedures of on-site detection and evaluation in order to determine the effects of material deterioration such as material loss from the components and structures that are sensitive to selective corrosion in industrial facilities, including nuclear power plants. The methodology involves visual inspection and hardness measurements in situ complemented by sample removal. These procedures include (a) representative sampling of components sensitive to selective corrosion, (b) the visual inspection, and (c) the hardness test, respectively. For an exact analysis, additional laboratory testing is recommended. The methodology is most applicable to grey cast iron and copper alloy with more than 15 % zinc. Extension to other alloys requires supportive evidence of validation. Assessment criteria orientated to the nuclear power plant application during the past five years before the end of extended operation define the necessity for further engineering evaluation and action like, for example, further sampling, higher frequency of inspection, and component repair or exchange. This specification is not applicable for components used where the representative sampling of surfaces in contact to the fluid is not detectable optically or detected with the portable hardness tester. Also, in case of non-representative component selection like in HVAC or building service application, this specification is not applicable. For components not used in nuclear power plant, the assessment criteria have to be agreed by the parties. Assessment criteria of hardness test alone is not applicable to the evaluation of structural integrity of Al-bronze, NAB, and Cu-Ni.