Dynamic alarm presentation in a nuclear plant control room

Claim 1

In a nuclear power plant having a nuclear steam supply system constituted by a multiplicity of components which can be operated in a coordinated manner to control plant operating variables for each of a plurality of preestablished plant operating modes; means for measuring a preestablished plurality of said operating variables and generating a first plurality of parameter signals commensurate with at least some of said variables; means for storing a set point value for each of said parameter signals; an alarm display containing a plurality of alarm tiles associated with said plurality of parameter signals; alarm logic means for generating an alarm signal when a particular parameter signal exceeds a particular set point; and means for activating a particular tile in response to said alarm signal; wherein the improvement comprises: means for generating a variable of set points for each parameter, each value of such variable set point corresponding to one of said plant operating modes; the alarm logic means compares said particular parameter signal with the particular value of said variable of set point corresponding to the particular mode in which the plant is operating; whereby the activation of an alarm tile is dependant on the value of its corresponding parameter signal and a variable set point value dependant on the mode of plant operation.