Evaluation and Optimization of Ventilation Systems of Control Rods in Nuclear Power Plants

In order to evaluate the security of the system and optimize its limit value, the characteristics of the ventilation system is analyzed by comparing the CFD calculation results and the experimental parameters. The results show that the increasing of the control rods is beneficial to both the uniform distribution of the air flow and the cooling efficiency of the system, which promotes the operation safety of the control rod drive mechanism. Although the outlet temperature of the ventilation system is a key index as the cooling efficiency, the number and distribution of the control rods should be considered together. The limit value of the outlet temperature should be changed as the control rod is added.