Disclosed are a method and a communication method for setting transmission authority of a nuclear power plant safety measurement control system. The nuclear power plant safety measurement control system transmission authority setting method is a communication node provided in a plurality of systems included in the channel constituting the nuclear power plant safety system, a local switch connected to the plurality of communication nodes and star topology (star topology) And a group switch connected to a plurality of local switches and a star topology, and a backbone switch connected to a plurality of group switches and a star topology, to transmit and receive data within each system and to transmit and receive data between the systems. Is assigned hierarchically by the relay method of the local switch, the group switch and the backbone switch to complete the transmission / reception operation of all the grids and the communication nodes in one channel. Therefore, there is an advantage that it is possible to grant an equal transmission authority to each communication node by granting exclusive transmission authority by layer by the backbone switch. ; Nuclear Power Plant, Safety Instrumentation Control System, Communication Network, Forming Topology
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