From Hazard Assessment to Operational Action: A Preliminary Evidence-Bounded Intervention-Selection Framework for Hydrogen Energy Facilities

Hydrogen energy facilities require recurring intervention decisions under incomplete probability data. This study proposes the Differentiated Process-Safety Intervention Framework (DPSIF), a preliminary conceptual framework for structuring such decisions. A published PRISMA 2020 review identified 820 records; DPSIF-specific re-screening retained 120 of its 149 core studies and selected 29 other records from the same search, yielding a 149-source structured evidence map. Seventeen regulatory and institutional instruments formed a separate corpus. Eighteen retrospective cases, 850 HIAD 2.1 records, and five advisory consultation sessions with four advisers supported boundary interpretation, descriptive illustration, and procedural checks. DPSIF distinguishes technical consequence severity (R), demonstrated hydrogen-specific control capacity (C), and external exposure and emergency sensitivity (E). A provisional monotonic R-C matrix assigns the baseline pathway, with E acting as a bounded modifier; binding requirements and mandatory overrides take precedence. Enumeration of all 27 R-C-E combinations checked monotonicity and non-relaxation only. Alternative matrices and E rules changed 2–6 pathway assignments, indicating design sensitivity, while retrospective cases illustrated evidence gaps and admissible pathway ranges. DPSIF provides an evidence-bound specification for prospective testing; measurement validity, inter-rater reliability, comparative decision performance, and operational effectiveness require prospective validation before operational use.