Patent Number: 042636540
Section: claims

1. A system for determining a value representing a normal operating value of at least one type of plant data corresponding to a presently operating step of an operating plant comprising first means for individually comparing signals representing the present status of a plurality of first types of plant data with signals representing the respective values for a predetermined status thereof and for producing respective output signals corresponding to the individual comparison results, second means for producing a signal corresponding to the present operation step of the plant in response to the signals produced by said first means, third means for storing various values representing normal operating values of at least one second type of plant data corresponding to the various operating steps of the plant, and fourth means for selecting the value representing the normal operating value of the at least one second type of plant data from the values stored by said third means in response to the signal produced by said second means and for producing at least one signal corresponding to the value representing normal operating value. 2. A system according to claim 1, in which the at least one second type of plant data to be determined is reactor pressure of the plant. 3. A system as defined in claim 1 wherein said first means includes a plurality of registers receiving said signals representing the present status of plant data, and a plurality of comparators each connected to a respective register and to a respective signal representing the values for a predetermined status. 4. A system for determining a value representing a normal operating value of at least one type of plant data corresponding to a presently operating step of an operating plant comprising first means for calculating the ratio of the present value of a first type of plant data to the rated value thereof and for producing a signal corresponding to the calculated ratio and indicative of a present operating step of the plant, and second means for multiplying the rated value of at least one second type of plant data by the ratio value derived from said first means and for producing at least one value signal corresponding to the multiplication result and representing the normal operating value of the at least one second type of plant data corresponding to the present operating step. 5. A system according to claim 4, in which said first type of plant data is reactor power and said second type of plant data includes at least one of main steam flow, feedwater flow, and generator power.