Common mode fault reduction procedures and apparatus for nuclear security related software control systems

摘要

A computer system (100) for executing a task according to different clock frequencies to reduce common mode failures in the computer system, the computer system comprising: at least a first division (105-1) and a second division (105 -N), the first division having a first clock frequency and the second division having a second clock frequency, each of the first division (105-1) and the second division (105-N) including a respective instrument (110 , 115); a first processor configured to execute a task in the first division (105-1) according to the first clock frequency; and a second processor configured to execute the task in the second division (105-N) according to the second clock frequency, in which each respective instrument (110, 115) of the first division (105-1) and the second division (105-2) is configured to: determine if one or more of the divisions is in a trip condition, in which a trip condition is indicative of an initialization and / or activation of a shutdown and / or actuation procedure , based on detecting a discrepancy of at least one of the first division (105-1) and the second division (105-2); determining if a division is in a fault state and cannot send a trigger signal; and operating the external device based on a determination, based on a voting procedure, that there is at least one trigger condition and a fault state.