An apparatus and method controlling output for set-up signal of pressure point in order to control automatically a steam bypass control system, and an apparatus and method controlling automatically a steam bypass control system thereof

PURPOSE: An apparatus and method for controlling the output of a pressure value set signal for automatically controlling a steam bypass control system, and an apparatus and method for automatically controlling the steam bypass control system due to the same are provided to vary a set point, thereby preventing the temperature of a cold leg from rising. CONSTITUTION: An apparatus for controlling the output of a pressure value set signal for automatically controlling a steam bypass control system includes a pressure value set signal output part, a first logical value output part, a second logical value output part(130), a NAND gate circuit part(140), and a first output control part(150). The pressure value set signal output part outputs the pressure value set signal. The first logical value output part outputs a first logical value. The second logical value output part outputs a second logical value. The NAND gate circuit part outputs a NAND value. The first output control part controls whether or not the pressure value set signal is output. [Reference numerals] (110) Press value set signal output part; (120) First logical value output part; (130) Second logical value output part; (140) NAND gate circuit part; (150) First output control part; (160) Second output control part; (AA) Reactor coolant cold leg temperature; (BB) Reactor output; (CC) Reactor coolant average temperature; (DD) Standard temperature; (EE) Administrator's control signal