Patent Number: 
Section: claims

1. A system for controlling a nuclear power plant including at least one nuclear reactor, the system comprising:a set of sensors and actuators associated with the at least one nuclear reactor;a plurality of electronic control units, each of the electronic control units being configured to perform at least one action from among acquiring a value measured by a corresponding sensor and controlling an actuator, the electronic control units and/or the at least one sensor and/or the at least one actuator being according to several different nuclear safety classes; andat least one information processing unit formed by a processor and a memory associated with the processor, the at least one information processing unit configured for managing the display of data on at least one display screen, the data being associated with the electronic control units, the at least one information processing unit being connected to the plurality of electronic control units, the at least one information processing unit comprising:a set of overlay creation electronic modules for creating overlays, the set of overlay creation electronic modules being configured to create several separate overlays, each of the overlays containing information to be displayed for a respective one of the nuclear safety classes, associated with one or several of the electronic control units according to the nuclear safety class; andan electronic generating module configured to generate at least one data page to be displayed, each of the data pages being obtained by superimposing a plurality of the separate overlays. 2. The system according to claim 1, wherein the at least one information processing unit further comprises at least one module for creating the at least one overlay for each respective nuclear safety class, the overlay creation modules being separated from one nuclear safety class to the next. 3. The system according to claim 1, wherein the at least one information processing unit comprises a single electronic generating module, the electronic generating module being the single electronic generating module. 4. The system according to claim 1, wherein the electronic generating module is according to a highest nuclear safety class from among the different nuclear safety classes. 5. The system according to claim 1, wherein the overlays include an overlay associated with a higher nuclear safety class and an overlay associated with a lower nuclear safety class, the electronic generating module being configured to generate each of the pages by superimposing the overlay associated with the higher nuclear safety class on top of the overlay associated with the lower nuclear safety class, to favor the information from the higher nuclear safety class in case of conflict during the superposition of the overlays. 6. The system according to claim 1, wherein the created overlays are separated from one nuclear safety class to the next. 7. The system according to claim 1, wherein each nuclear safety class is a safety class according to a standard chosen from among the group consisting of: standard IEC 61513, standard IEC 61226, standard IAEA, the United States of America nuclear safety standard, the European nuclear safety standard, the French N4 nuclear safety standard, the Japanese nuclear safety standard, the nuclear safety standard of the Republic of Korea, the Russian nuclear safety standard, the Swiss nuclear safety standard and the British nuclear safety standard. 8. A method for managing the display of data on at least one display screen to control a nuclear power plant including at least one nuclear reactor, the data coming from a plurality of electronic control units, each of the electronic control units being configured to perform at least one action from among acquiring a value measured by a sensor and controlling an actuator, the at least one sensor and/or the at least one actuator being associated with the at least one nuclear reactor, the electronic control units and/or the at least one sensor and/or the at least one actuator being according to several different nuclear safety classes, the method being carried out by at least one information processing unit configured to be connected to the plurality of electronic control units, the at least one information processing unit being formed by a processor and a memory associated with the processor, the method comprising:creating, for each page to be displayed on at least one display screen, several separate overlays, each of the overlays containing information to be displayed for a respective one of the nuclear safety classes, associated with one or several of the electronic control units according to the nuclear safety class,generating at least one data page to be displayed, each of the at least one pages being obtained by superimposing a plurality of the separate overlays, anddisplaying the at least one data page on the at least one display screen. 9. The method according to claim 8, wherein, during the creating of the overlays, the created overlays are separated from one nuclear safety class to the next. 10. The method according to claim 8, wherein the overlays include an overlay associated with a higher nuclear safety class and an overlay associated with a lower nuclear safety class, during the generating of the at least one page, the overlay associated with the higher nuclear safety class is superimposed on top of the overlay associated with the lower nuclear safety class, to favor the information from the higher nuclear safety class in case of conflict during the superposition of the overlays. 11. A non-transitory computer readable medium including instructions which, when executed by a computer, carry out all of the steps of the method according to claim 8.