Study on the improvement of Steam Generator in PWR

(the evaluation of the influence on the amount of the steam by the designs of Economizer and the distributions of the cooling water)

Abstract

This research is the one about the Stream Generator (SG) of Pressurized Water Reactors (PWR). We particularly focus on the economizer and coolant distributions. Economizer is the device which controls the flow of the coolant in secondary loop, and there are two types of economizer in this research. One has both the vertical distribution plate and the baffle plates as the economizer, and the other only has the vertical distribution plate and as the economizer. To analyze the characteristics of SG, we made the SG model and the way to calculate the vapor mass flow rate in SG. Then, we inspected the accuracy of our modeling and the calculation. In addition, we examined the relation between the size of the economizer, the distribution of the coolant in secondary loop and the vapor mass flow rate. Then, we considered the causes of the results in this research based on the calculation.