The Positive Period Method of Calibrating Control Rods of the Afrri-Triga Reactor Using the Afrri Data Acquisition System

摘要

Control rods of the AFRRI-TRIGA reactor are routinely calibrated by the use of the inhour relationship between the stable positive period and reactivity. The Armed Forces Radiobiology Research Institute (AFRRI) Data Acquisition System (DAS), after receiving the amplified signal from a compensated ionization chamber, samples and digitizes the input voltage each 4.2667 seconds. Both the raw data and the stable period are typed out. The design stable period is between 30 to 70 seconds and from 18 to 22 incremented steps are necessary to calibrate the central transient rod. The core of the period calculation programming is board program BPNA (Function Generator) which is listed and discussed in detail. (Author)