轻水堆主冷却剂回路部件在役检验指南第1部分:机械化超声波检验

[中文适用范围]： 本文件提供了使用机械化超声波测试（UT）设备对轻水堆反应堆冷却剂回路部件进行服役前检查（PSI）和在役检查（ISI）的指南。 本文件也适用于核设施的其他部件。 进行机械化超声波检查是为了能够在以下情况下进行评估： ——故障指示（例如，奥氏体焊缝或复杂的几何形状）， — 几何形状引起的指示（例如，根部凹陷的情况）， — 复杂的几何形状（例如，配合焊缝）接缝），或者 — 如果可以通过这种方式减少测试人员的辐射暴露。 超声波测试方法的定义是为了验证不连续性（体积或表面开放）、超声波测试设备的要求、测试和设备系统的准备、测试的实施和记录。 本文件适用于使用接触技术中的法向光束探头和斜光束探头进行 UT 的指示检测。 它用于铁素体和奥氏体焊缝和母材的 UT 检验，作为搜索技术，并与国家参考核安全标准的验收标准进行比较。 浸入技术和施胶技术不属于本文件的范围，并且是独立合格的。 注：有关试验段、试验范围、检查周期、检查间隔和指标评价的数据在适用的国家核安全标准中规定。 除非国家核安全标准另有规定，均适用本文件的最低要求。 本文件没有定义： ——检查范围和扫描计划； - 验收标准; ——异种金属焊缝和尺寸确定的 UT 技术（必须单独进行资格认证）； ——浸没技术； ——飞行时间衍射技术 (TOFD)。 建议UT检查与要考虑的部件、缺陷类型和大小密切相关，并在具体的国家检验资质中进行审查。 [外文原描述]： This document gives guidelines for pre-service-inspections (PSI) and in-service inspections (ISI) with mechanized ultrasonic test (UT) devices on components of the reactor coolant circuit of light water reactors. This document is also applicable on other components of nuclear installations. Mechanized ultrasonic inspections are carried out in order to enable an evaluation in case of — fault indications (e.g. on austenitic weld seams or complex geometry), — indications due to geometry (e.g. in case of root concavity), — complex geometries (e.g. fitting weld seams), or — if a reduction in the radiation exposure of the test personnel can be attained in this way. Ultrasonic test methods are defined for the validation of discontinuities (volume or surface open), requirements for the ultrasonic test equipment, for the preparation of test and device systems, for the implementation of the test and for the recording. This document is applicable for the detection of indications by UT using normal-beam probes and angle-beam probes both in contact technique. It is to be used for UT examination on ferritic and austenitic welds and base material as search techniques and for comparison with acceptance criteria by the national referencing nuclear safety standards. Immersion technique and techniques for sizing are not in the scope of this document and are independent qualified. NOTE Data concerning the test section, test extent, inspection period, inspection interval and evaluation of indications is defined in the applicable national nuclear safety standards. Unless otherwise specified in national nuclear safety standards the minimum requirements of this document are applicable. This document does not define: — extent of examination and scanning plans; — acceptance criteria; — UT techniques for dissimilar metal welds and for sizing (have to be qualified separately); — immersion techniques; — time-of-flight diffraction technique (TOFD). It is recommended that UT examinations are nearly related to the component, the type and size of defects to be considered and are reviewed in specific national inspection qualifications.