Abstract
Incident reports provide valuable empirical evidence on hydrogen safety, yet their narrative structure limits reuse in engineering analysis. This study proposes a kernel-based framework that transforms incident data into standardized case cards that represent key physical-hazard processes. Five interconnected kernels are defined to capture hydrogen release, accumulation, dispersion, or explosion, mitigation through venting, and human exposure. A lightweight ontology links parameters, mitigation actions, and outcomes, while a knowledge graph enables structured storage and traceable retrieval. Application to publicly available incident data demonstrates improved comparability and analytical usability. The results suggest that kernel-based structuring provides a practical pathway for integrating empirical safety knowledge into engineering design and digital safety tools and may support future standardization of incident-based risk analysis.
