The precompression system of the ITER Central Solenoid (CS) consists of nine identical units designed to provide an axial precompression force of 210 MN at room temperature to the stack of the six independently energised modules of the CS. This load allows the modules to be maintained in contact with each other in the vertical direction during operation. Precompression is achieved by using tensioning components, by pretensioning at room temperature the tie plates of the precompression system. In addition, such components allow maintaining the necessary preload during the operation of the CS at cryogenic temperature. Tensioning components consist of large diameter tensioners (up to M190) and threaded rods (up to M110), as well as of different assemblies including multi-jackbolt tensioners, washers and jackbolts. They are manufactured from double aged forged or hot rolled Inconel 718, an age-hardenable, high strength nickel based superalloy. Stringent specification requirements apply to the threaded rods and the other components of the tensioning system. They were extensively characterised through measurements of metallurgical, physical, mechanical properties and non-destructive examinations. The paper provides a summary of the results of such wide campaign of evaluation based on testing heavy gauge products of a broad range of sizes and shapes, fully representative of the series production. The results are assessed against the requirements of the technical specification and applicable national and international standards.

ITER中央电磁阀（CS）的预压缩系统由九个相同的单元组成，这些单元设计用于在室温下为CS的六个独立通电模块的堆叠提供210 MN的轴向预压缩力。该载荷使模块在操作过程中保持在垂直方向上相互接触。通过使用张紧组件，通过在室温下预张紧预紧系统的连接板，可以实现预紧。另外，这样的部件允许在低温下在CS操作期间维持必要的预紧力。张紧部件包括大直径张紧器（最大M190）和螺杆（最大M110），以及不同的组件，包括多顶螺栓张紧器，垫圈和顶螺栓。它们由双时效锻造或热轧Inconel 718制成，Inconel 718是一种可时效硬化的高强度镍基高温合金。严格的规格要求适用于螺杆和张紧系统的其他组件。通过对冶金，物理，机械性能和无损检测的测量，对它们进行了广泛的表征。本文以测试各种尺寸和形状的重规格产品为基础，总结了这种广泛评估活动的结果，这些产品完全代表了批量生产。根据技术规范以及适用的国家和国际标准的要求对结果进行评估。严格的规格要求适用于螺杆和张紧系统的其他组件。通过对冶金，物理，机械性能和无损检测的测量，对它们进行了广泛的表征。本文以测试各种尺寸和形状的重规格产品为基础，总结了这种广泛评估活动的结果，这些产品完全代表了批量生产。根据技术规范以及适用的国家和国际标准的要求对结果进行评估。严格的规格要求适用于螺杆和张紧系统的其他组件。通过对冶金，物理，机械性能和无损检测的测量，对它们进行了广泛的表征。本文以测试各种尺寸和形状的重规格产品为基础，总结了这种广泛评估活动的结果，这些产品完全代表了批量生产。根据技术规范以及适用的国家和国际标准的要求对结果进行评估。本文以测试各种尺寸和形状的重规格产品为基础，总结了这种广泛评估活动的结果，这些产品完全代表了批量生产。根据技术规范以及适用的国家和国际标准的要求对结果进行评估。本文以测试各种尺寸和形状的重规格产品为基础，总结了这种广泛评估活动的结果，这些产品完全代表了批量生产。根据技术规范以及适用的国家和国际标准的要求对结果进行评估。