The ITER project is the largest international collaboration in the scientific field ever set up. It forms the heart of a unique collaborative agreement to build the first experimental nuclear fusion device designed to prove the scientific and technological feasibility of sustained fusion power generation. Among hundreds of systems, the In-Vessel Coils System plays a crucial role in ITER: ensuring and maintaining stable plasma operations. ITER has an ambitious inherent availability target for plasma production. To be able to achieve this objective, the potential technical risk that may affect the machine operation, was assessed by means of RAMI (Reliability, Availability, Maintainability and Inspectability) approach. The RAMI analysis for the IVC system was performed on the system design, following the Staged Approach Configuration adopted by ITER for Construction and Operation phases. A functional breakdown was prepared, resulting in the system being divided into 3 main functions described using the IDEFØ method. A qualitative analysis was performed applying the Failure Modes, Effects and Critical Analysis technique in order to identify the potential effects due to different anomalies of the IVC components. Criticality chart highlights the distribution of the Failure Modes across three risk zones with regard to their probability of occurrence and the impact on the availability. In relation to the operation of the IVC System, the analysis identified 32 risks, none of whom were classified as major. To estimate the reliability and availability of IVC system and to assess the compliance to the requirements, a quantitative analysis was performed using the Reliability Block Diagrams Analysis. The inherent availability of the IVC system during DT phase was calculated over the 20 years of ITER lifetime. The availability of the ITER IVC system results to be compliant with the inherent availability requirement for DT phase.

国际热核实验堆项目是有史以来建立的最大的国际科学合作。它是建立唯一的实验性核聚变装置的独特合作协议的核心，该装置旨在证明持续聚变发电的科学和技术可行性。在数百个系统中，船用线圈系统在ITER中起着至关重要的作用：确保并维持稳定的等离子运行。ITER对血浆生产有一个雄心勃勃的固有可用性目标。为了实现此目标，通过RAMI（可靠性，可用性，可维护性和可检查性）方法评估了可能影响机器运行的潜在技术风险。针对IVC系统的RAMI分析是在系统设计上进行的，遵循ITER在施工和运营阶段采用的分阶段方法配置。准备了功能分解，将系统分为使用IDEFØ方法描述的3个主要功能。使用故障模式，影响和临界分析技术进行了定性分析，以识别由于IVC组件异常而引起的潜在影响。关键度图表突出显示了故障模式在三个风险区域中的分布情况，涉及它们的发生概率以及对可用性的影响。关于IVC系统的运行，分析确定了32种风险，没有一个被归类为重大风险。为了评估IVC系统的可靠性和可用性，并评估对要求的遵守情况，使用可靠性框图分析进行了定量分析。在ITER生命周期的20年中，计算了DT阶段IVC系统的固有可用性。ITER IVC系统的可用性要符合DT阶段固有的可用性要求。