A Safety Gate Framework for Industrial Work Permit Systems:Slot-Based Work Condition Codes and Parallel Exposure of Risk Preconditions

This study proposes a structural safety management framework that transforms the conventional work permit system into a Safety Gate.Industrial work conditions are represented using slot-based work condition codes consisting of Process, Location, Equipment, Environment, Energy, Time, and Weather.Based on the combination of work condition codes entered during work permit issuance, the proposed framework exposes risk preconditions derived from historical accident cases and potential risks derived from combinations of work conditions.The Safety Gate operates as a pre-execution verification mechanism that identifies risk conditions before industrial work begins, shifting industrial safety management from post-incident analysis toward prevention-oriented safety verification.