Dynamics simulation of the Thai resarch reactor 1/1 on Microcomputer

Abstract

The mathematical model of the Thai Research Reactor (TRR 1/1) has been developed to study the reactor system performances. The model is running in a real-time interactive mode. Four screens display were created by labview for various purposed. Reactor preview shows the general information, temperature and power meters and charts as in the actual panel. Control rod panel presents the control panel of control rod. Reactor cooling system illustrates the schematic diagram and status of equipments in cooling system. The last one is fuel pin profile which shows temperature and neutron flux distribution in the fuel pin. The source code was written in Fortran®. Block diagram was created in cassbase ® to manage the sequence calculations. Then Casseng®, calculation engine, use cassbase® and complied source code together to get calculation results. The front end and calculation engine communicate via Dynamic Data Exchange (DDE) in windows base program. Special function in Labview® was prepared by Cassiopiea to facilitate us in making the communication with calculation engine. The interface between calculation engine and front end displays perform well and with proper result response, using simplified neutronic and thermal-hydraulic describing TRR1/1. The simplified equations of neutronic and thermal-hydraulic assumed one neutron energy group and the neutron cross section at thermal energy. The primary cooling system was assumed to be force flow instead of natural convection. Fuel burnup was not taken into consideration. Steady state and transient conditions were studied. It was found that the calculation results were several magnitudes different from actual measurements. Nevertheless, the interfacing between calculation modules and front-end displays function properly with appropriate responded to any changes made to the reactor system.