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Updated: Jan 25, 2026

Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment
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Application of causality analysis on nuclear reactor systems.

D Chionis1, A Dokhane1, H Ferroukhi1

  • 1Paul Scherrer Institut, Laboratory for Reactor Physics and Thermal-Hydraulics, CH-5232 Villigen PSI, Switzerland.

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Causality analysis, using connectivity measures, accurately identifies cause-and-effect relationships in nuclear reactor systems. This aids in understanding complex interactions for safer plant operation during disturbances.

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Area of Science:

  • Nuclear Engineering
  • Systems Analysis
  • Data Science

Background:

  • Causality analysis identifies cause-and-effect links in complex systems.
  • Widely applied in neuroscience, climatology, and econometrics.
  • Crucial for understanding highly coupled processes in nuclear reactors.

Purpose of the Study:

  • To apply causality analysis to nuclear reactor systems for enhanced operational safety.
  • To infer cause-and-effect relationships between coupled processes.
  • To assist in safe and reliable nuclear power plant operation during disturbances.

Main Methods:

  • Utilized renormalized partial directed coherence and directed transfer function connectivity measures.
  • Validated through simulated and measured test cases.
  • Applied to analytical models, simulated reactor systems, and real-world data from a Swiss boiling water reactor.

Main Results:

  • Connectivity analysis accurately identified the importance of activation signals in analytical and simulated reactor models.
  • Demonstrated capability in pinpointing causes of anomalies in complex, measured data.
  • Provided insights into interactions between neutronic and thermal-hydraulic processes.

Conclusions:

  • Causality analysis is effective for understanding complex interactions in nuclear reactors.
  • This method enhances the ability to diagnose anomalies and ensure safe operation.
  • Facilitates a deeper comprehension of underlying physical processes in nuclear power plants.