A main control room for a nuclear power plant, comprising: a nuclear-power-plant operation monitoring system which is disposed in the main control room, wherein the nuclear-power-plant operation monitoring system comprises: a display panel which is disposed at a position visible to all workers in the main control room, and is configured to display a main parameter image which is a display of main parameters of the nuclear power plant associated with positions in the nuclear power plant, and an abnormal parameter image which is a display of an abnormal parameter of which the value is abnormal, out of the main parameters; and a non-safety control device including a non-safety control unit that is configured to control the operation of the nuclear power plant based on the operation of the workers, and a non-safety control display unit that is configured to display an image under the control of the non-safety control unit, characterized in that the non-safety control unit is configured to display an initial window including the main parameter image and the abnormal parameter image, on the non-safety control display unit, in conjunction with the display on the display panel, and to activate a control program of the nuclear power plant related to the abnormal parameter, in a case where the display of the abnormal parameter in the initial window is selected by the worker. a nuclear-power-plant operation monitoring system which is disposed in the main control room, wherein the nuclear-power-plant operation monitoring system comprises: a display panel which is disposed at a position visible to all workers in the main control room, and is configured to display a main parameter image which is a display of main parameters of the nuclear power plant associated with positions in the nuclear power plant, and an abnormal parameter image which is a display of an abnormal parameter of which the value is abnormal, out of the main parameters; and a non-safety control device including a non-safety control unit that is configured to control the operation of the nuclear power plant based on the operation of the workers, and a non-safety control display unit that is configured to display an image under the control of the non-safety control unit, a display panel which is disposed at a position visible to all workers in the main control room, and is configured to display a main parameter image which is a display of main parameters of the nuclear power plant associated with positions in the nuclear power plant, and an abnormal parameter image which is a display of an abnormal parameter of which the value is abnormal, out of the main parameters; and a non-safety control device including a non-safety control unit that is configured to control the operation of the nuclear power plant based on the operation of the workers, and a non-safety control display unit that is configured to display an image under the control of the non-safety control unit, characterized in that the non-safety control unit is configured to display an initial window including the main parameter image and the abnormal parameter image, on the non-safety control display unit, in conjunction with the display on the display panel, and to activate a control program of the nuclear power plant related to the abnormal parameter, in a case where the display of the abnormal parameter in the initial window is selected by the worker.