Derivation and use of probability of detection curves in the nuclear industry
Derivation and use of probability of detection curves in the nuclear industry
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DOI：
10.1784/insi.2010.52.12.657
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发表时间：
2010-12-01
期刊：
影响因子：
1.1
通讯作者：
Simola, K.
中科院分区：
文献类型：
--
作者：
Gandossi, L.;Simola, K.
利用检测曲线的可测量性来量化无损检测的可靠性在航空工业中很常见，但在核工业中相对较少，至少在欧洲国家是这样。其主要原因在于被检查部件的性质。被检查缺陷的样本量往往要低得多，并且通常很难在试验中获得或制造代表性缺陷。足够多的零件，以得出关于被调查的NDT系统可靠性的统计结论。类似的考虑导致了ENIQ检验鉴定方法的发展，基于技术论证的思想，即一份收集证据和推理的文件，保证无损检测系统确实能够发现缺陷，ENIQ方法已在许多欧洲国家广泛使用，并在欧洲以外地区也得到了赞赏，但它提供的保证通常是定性的。对检验合格输出进行定量的需求已变得越来越重要，特别是作为结构可靠性建模和定量风险通知-服务检测方法得到了越来越广泛的应用为了在结构的可持续性评估中对检测进行评价，需要对无损检测的可靠性进行测量。曲线提供了这样的度量标准。本文的目的是简要回顾用于量化无损检测可靠性的统计模型，以强调如果主要的基本假设和要求未得到验证，并澄清POD曲线和相关置信界限的性质可能引起的混淆
The use of ptobability of detection curves to quantify NDT reliability is common in the aeronautical industry, but relatively less so in the nuclear industry at least in European countries The main reason for this lies in the very nature of the components being inspected Sample sizes of inspected flaws tend to be much lower and It is often very difficult to procure or manufacture representative flaws in test-pieces in a high enough number to draw statistical conclusions on the reliability of the NDT system being investigated Similar considerations led to the development of the ENIQ inspection qualification methodology, based on the idea of the technical justification le a document assembling evidence and reasoning providing assurance that the NDT system is indeed capable of finding the flaws which it is designed to detect The ENIQ methodology has become widely used in many European countries and is gaining appreciation outside Europe as well but the assurance it provides is usually of a qualitative nature The need to quantity the output of inspection qualification has become MO e and more important, especially as structural reliability modelling and quantitative risk informed in-service inspection methodologies become more widely used To credit the inspections in structural tenability evaluations a measure of the NDT reliability is necessary A probability of detection (POD) curve provides such metricThe purpose of this mixt is to briefly review the statistical models proposed to quantify NDT reliability to highlight the potential problems that can arise if the main underlying assumptions and requirements are not verified and to clarify the confusion that can arise over the nature of the POD curve and associated confidence bounds