تحليل ديناميكي و بررسي عملكرد ورود CPS-AR به داخل مجتمع سوخت VVER-1000 در حالت نرمال و حادثه راكتور

Dynamic analysis an‎d performance eva‎luation of CPS-AR inser‎tion into VVER-1000 fuel assembly in normal operation an‎d reactor accident

مهندسي هسته اي

The objective of this research is to investigate the performance an‎d time of CPS-ARs entering the fuel assembly under normal reactor conditions an‎d also under reactor accident conditions (earthquake only) in the presence of dynamic an‎d static forces applied to it. In this study, first, the equations of a control rod fall in the guide channel were simulated by MATLAB Simulink. From this simulation, the control rod velocity profile, which is limited to 1.7 m/s, buoyancy force, shear stress, compressive stress an‎d fall time of 2.165 seconds were obtained. The outputs of MATLAB Simulink were used as input parameters for ABAQUS software. Then, a control rod from the VVER-1000 reactor control rod assembly along with its guide channel is considered with dynamic forces (coolant an‎d seismic forces) an‎d static forces (control rod weight force, fluid buoyancy force, weight force of the upper fuel assembly components) an‎d simulated with ABAQUS software. By applying these forces, the bending amount of the guide channel is calculated. After dynamic an‎d static analysis an‎d obtaining the displacement an‎d deflection of the guide channel, the conditions of CPS-ARs entry into the complex are examined under the following conditions; First, in normal reactor conditions; the forces applied to the control rod include its weight force, buoyancy force from the fluid to the control rod, shear stress force from the fluid to the control rod, compressive stress force from the fluid to the control rod, an‎d friction between the control rod an‎d the wall of the movement path (guide channel). The speed of the control rod movement is 1.8 m/s an‎d its fall time in this case is 2.182 seconds. Then, in reactor accident conditions (earthquake occurrence); in addition to the forces expressed in normal conditions, the simulated geometry is also affected by vibration forces caused by the earthquake.

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