METHOD FOR DETECTING FAULT OF THYRISTOR IN CONVERTER FOR CONTROL ROD DRIVE MECHANISM CONTROL SYSTEM, INCLUDING STEPS OF READING VOLTAGE OF COIL, READING COMMAND OF CURRENT, CHECKING OCCURRENCE OF THYRISTOR FAULT, AND ISSUING EMERGENCY WARNING IF THYRISTOR FAULT HAS OCCURRED

摘要

PURPOSE: A method is provided to improve stability of thyristor fault detection, and detect thyristor fault even when a control rod is in a stop mode. CONSTITUTION: A method comprises a first step(1) of reading a voltage of a rectified coil; a second step(2) of reading a command of the current flowing along the coil; a third step(3) of checking an occurrence of thyristor fault, by checking whether the command of the current is changed; and a fourth step(6) of issuing an emergency warning if thyristor fault has occurred, and returning to the first step if thyristor fault has not occurred.