| Title |
Design Modification and Correlation Verification between Reattachment Flow of Dispersed Jet and Local Thinning of Feedwater Heater |
| Authors |
김형준(Hyung Joon Kim) ; 김경훈(Kyung Hoon Kim) ; 황경모(Kyeong Mo Hwang) |
| Keywords |
감육 ; 유동가속부식 ; 급수가열기 ; 추기노즐 ; 충격판 Wall thinning ; Flow-accelerated corrosion ; Feedwater heater ; Extracting nozzle ; Impingement baffle |
| Abstract |
Feedwater heaters of many nuclear power plants have recently experienced severe wall thinning damange, which will increase as operating time progresses. Several nuclear power plants in Korea have experienced wall thinning damage in the area around the impingement baffle-installed downstream of the high pressure turbine extraction stream line-inside number 5A and 5B feedwater heaters. At that point, the extracted steam from the high pressure turbine is two phase fluid at high temperature, high pressure, and high speed. Since it flows in reverse direction after impinging the impingement baffle, the shell wall of the number 5 high pressure feedwater heater may be affected by flow-accelerated corrosion. This paper describes operation of experience and numerical analysis composed similar condition with real high pressure feedwater heater. This study applied squared, curved and new type impingement baffle plates to feedwater heater same as previous study. In addition, it shows difference of pressure distribution and value between single phase and two phase based on experience and numerical analysis. |