Study on Limit Margin of Rising and Cooling Rate in Primary Circuit of CPR1000 Unit

Abstract

The thermal conductivity of waste heat removal system of CPR1000 unit is analyzed, and the rate margin of primary circuit is studied. In this study, the design parameters of a domestic CPR1000 residual heat removal system are used to study the primary loop temperature margin according to the different core states, and the primary loop temperature margin according to the different valve openings of the residual heat removal system (RRA) . The results show that the CPR1000 unit has a large margin in cooling down, but there is no room for improvement in the process of heating up. Therefore, it is necessary for CPR1000 unit to enhance the effect of primary loop heating and cooling rate on primary loop thermal stress, material and control operation of system equipment.

Keywords

• primary circuit
• heating and cooling
• margin