• Book : 178()
• Pub. Date : 2025
• Page : pp.105505
• Keyword :

• Book : 178()
• Pub. Date : 2025
• Page : pp.105468
• Keyword :

The Low Level Waste Repository in West Cumbria requires, as part of their environmental safety case, a geological model to support hydrogeological understanding and future development of the site. A range of legacy data accrued over the last 60 years exists, which is characterised by variable data collection methods, formats, and quality. The geological model development process is atypical due to this large body of existing data and the requirements of the ESC, resulting in an initial primarily observational digital geological model. Outlined here is the approach undertaken for geological model development and includes terminology, data management practices, and considers the role of conceptualisation and it's direct application to the observational 3D digital model when there is significant existing observational data. Sites with significant legacy data and atypical requirements may be more common in the future, as more site investigations are completed and data are shared. The process applied is a development of Peter Fookes' work, highlighting the importance of the conceptual model, but that application of conceptual ideas to the development of 3D digital geological models may look different in a world of increasing observational data.

• Book : 30(1)
• Pub. Date : 2025
• Page : pp.egsp30-2024-19
• Keyword :

• Book : 227()
• Pub. Date : 2025
• Page : pp.112351
• Keyword :

• Book : 227()
• Pub. Date : 2025
• Page : pp.112426
• Keyword :

• Book : 178()
• Pub. Date : 2025
• Page : pp.105523
• Keyword :

Abstract

We developed a redundant logic for predicting Vertical Displacement Events (VDEs) using only magnetic diagnostics with a Support Vector Machine (Inoue et al 2022 Nucl. Fusion62 086007). This logic was experimentally validated in the integrated commissioning of JT-60SA. Triggering of VDEs results in significant asymmetric heat loads on first walls and electromagnetic loads on conducting materials. These concerns are mitigated by a newly proposed direction control for VDEs. We successfully detected VDEs in experiments and controlled their direction by setting the control voltage to zero upon detection, thus guiding VDEs in an intended direction and reducing the risk to the device from unmitigated VDEs in either direction, although completely avoiding VDEs remains the ideal. In the developed predictor, VDEs are predicted using proxies to monitor the controller’s performance with an adaptive voltage allocation scheme (Inoue et al 2021 Nucl. Fusion61 096009). For future experiments, we plan to extend our approach to monitor more detailed information from the equilibrium controller, including control values of each PID component, which has been shown to enhance the prediction accuracy of VDEs.

• Book : 65(1)
• Pub. Date : 2025
• Page : pp.016013
• Keyword :

• Book : 178()
• Pub. Date : 2025
• Page : pp.105512
• Keyword :

• Book : 10(1)
• Pub. Date : 2025
• Page : pp.101674
• Keyword :

• Book : 227()
• Pub. Date : 2025
• Page : pp.112354
• Keyword :