Information security risk evaluation system and method for nuclear power plant electrical secondary system

The invention discloses an information security risk evaluation system for a nuclear power plant electrical secondary system. The information security risk evaluation system comprises a data link layer interface, an assessment instrument and a controller, wherein the data link layer interface is connected with a nuclear power plant secondary system network, and used for receiving and transmittingdata messages sent by the secondary system network by N times; N is an integer being greater than 1; the assessment instrument is connected with the data link layer interface, and used for receiving and processing data messages transmitted in first (N-1) times by the data link layer interface to generate test messages, transmitting the test messages to the secondary system network, receiving and processing a data message transmitted by the data link layer interface by the Nth time, and generating a study and judgment result; and the controller is used for receiving and displaying the study andjudgment result. The inve