Development for the control device of control rods in the KMRR using a personal computer

This report presents that an experimental facility for the control of rods in the KMRR(Korea Multipurpose Research Reactor) is designed and fabricated using four stepping motors and an IBM-PC/XT personal computer. The main structures f the facility are pulse generator, motor driver, rod position and present power indicator, and trip status display and alarm actuator. The rod driving mechanism is composed of four stepping motors, gear boxes, cable sheaves and encoders. Hybrid two phase stepping motors of 1.8 degree step angle are used , and 1-2 phase excitation mode is used. Pulse generator is designed using an INTEL 8085A microprocessor. Two types of shaft encoders are used to control the rod's movement and to detect any error. The encoders used for input side (stepping motor shaft) are 200 pulses per revolution and the other ones for output side(sheave shaft) are 1000 pulses per revolution. The control program is written in Turbo-Basic language, and the control rods can be controlled automatically and manually. (Author)