APPARATUS FOR PREVENTING UNWANTED HIGH VOLTAGE APPLIED TO CONTROL ROD DRIVING SYSTEM IN NUCLEAR POWER PLANT AND METHOD THEREOF

摘要

The present invention relates to a method and an apparatus for preventing accidentally falling of a control rod in a nuclear power plant. More specifically, the control rod drive device, a power control device for supplying a current to the control rod drive device, and A high voltage prevention device of a control rod control system for use in a control rod control system including a logic unit for outputting a firing pulse signal for controlling an output, the apparatus comprising: a substitution for outputting a replacement signal capable of replacing the firing pulse signal output from the logic unit; Signal generator; A main signal monitor for monitoring an abnormality of the firing pulse signal output from the logic device; And a signal selection circuit for supplying a substitute signal to the power control device in place of the firing pulse signal when an abnormality of the firing pulse signal is detected from the main signal monitoring device. will be.;According to the present invention, unlike the conventional technique of firing all three-phase SCRs of the upper tong winding of the SCR control signal in a high voltage state, the SCR is not fired in a high voltage state. It can solve the disadvantage that can cause physical damage.;Nuclear power plant, control rod, drop, winding, damage, high voltage