Speaker
Description
The Second Target Station (STS) project is advancing a next-generation spallation target assembly to meet demanding performance, availability, and maintainability requirements. This presentation highlights the current STS Target Assembly design with emphasis on the structural concept, materials of construction, joining and fabrication approaches, and the analysis methods used to manage cyclic loading and extend service life.
The STS Target Assembly employs a segmented architecture intended to improve overall reliability by limiting the consequences of localized failures and enabling replacement strategies aligned with remote handling. Candidate materials are discussed in the context of radiation knowledge, bonding, thermal performance, and manufacturability. The design integrates joining techniques selected to balance structural integrity with fabrication practicality, including considerations for residual stress and performance under irradiation and thermal cycling.
A fatigue assessment framework is presented that combines representative residual stresses, thermal and pressure loading, and design margins appropriate for high-cycle fatigue. The analysis results guide geometric refinement, joint detailing, and segmentation boundaries to reduce peak stresses and improve robustness. The presentation concludes with the current design status, key technical risks, and planned validation activities, highlighting how segmentation, material selection, and joint design collectively support improved reliability and lifecycle performance for STS operations.