The first boundary feedthroughs of the ITER Heating Neutral Beam injectors are key components of the neutral beam system. They allow the penetration of signals and power from/to the beam line components, through the confinement boundary of ITER. This article will present the status of their design as well as the safety requirements to be met. The first part of this article is dedicated to the presentation of the two types of feedthroughs (instrumentation and high voltage). The main design requirements are given before the presentation of the status of these components, which are at final design level. The cabling strategy used for the instrumentation allows flexibility to recover the signals from the beam line components in case of failure of the in-vessel cabling or remote handling connector. The design of both types of feedthroughs is based on commercial products arranged in a specific configuration to create a double containment and to limit common failure modes. These feedthroughs are compatible with the remote handling maintenance. This requirement comes from the activation level expected on these components. The second part presents the safety requirements for these components. As they use ceramic and brazed joints, which are not covered by mechanical standards, the demonstration of their robustness must be provided. This will be done through a control and testing plan which is under study. Beside mechanical analysis, the manufacturing and testing of these components will be carefully controlled. This quality control strategy will be based on existing standards adapted for these specific components. It will include the monitoring of the raw materials used, the control of each step of the manufacturing and the testing. The testing will include outgassing, pressure, leak and vibration tests to replicate seismic events. The present design satisfies all the requirements. It presents important margins to the allowable stresses, which would allow a successful qualification of these components.
First boundary electrical feedthroughs for the Heating Neutral Beams injectors of ITER
Mauro Dalla Palma;
2014
Abstract
The first boundary feedthroughs of the ITER Heating Neutral Beam injectors are key components of the neutral beam system. They allow the penetration of signals and power from/to the beam line components, through the confinement boundary of ITER. This article will present the status of their design as well as the safety requirements to be met. The first part of this article is dedicated to the presentation of the two types of feedthroughs (instrumentation and high voltage). The main design requirements are given before the presentation of the status of these components, which are at final design level. The cabling strategy used for the instrumentation allows flexibility to recover the signals from the beam line components in case of failure of the in-vessel cabling or remote handling connector. The design of both types of feedthroughs is based on commercial products arranged in a specific configuration to create a double containment and to limit common failure modes. These feedthroughs are compatible with the remote handling maintenance. This requirement comes from the activation level expected on these components. The second part presents the safety requirements for these components. As they use ceramic and brazed joints, which are not covered by mechanical standards, the demonstration of their robustness must be provided. This will be done through a control and testing plan which is under study. Beside mechanical analysis, the manufacturing and testing of these components will be carefully controlled. This quality control strategy will be based on existing standards adapted for these specific components. It will include the monitoring of the raw materials used, the control of each step of the manufacturing and the testing. The testing will include outgassing, pressure, leak and vibration tests to replicate seismic events. The present design satisfies all the requirements. It presents important margins to the allowable stresses, which would allow a successful qualification of these components.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
