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This paper proposes state-oriented approach for knowledge management system, especially for risk management of nuclear power plants. The knowledge model is a kind of state flow in which each state is changed by actions and each action is activated by actors or states. To construct such knowledge base, huge manuals have been analyzed by a unique natural language processing algorithm, called a functional model of language. The authors used this knowledge model and developed an open-source platform for risk management. The system enables to develop procedural knowledge management systems that can check incompleteness, ambiguity and inconsistency of the set of procedures.