Experimental Study on the Blowdown Load during the Steam Generator Feedwater Line Break Accident in the APR1400
Integral effect tests using the ATLAS facility were performed to obtain the thermal-hydraulic parameters such as dynamic and static pressures, local temperatures, and flow rates during a feedwater line break of a steam generator. The break of a feedwater line was simulated using a double rupture disc assembly in order to satisfy the requirements for the break opening time of around a few milliseconds. In the present work, estimated break opening time was less than 1.5 milliseconds and broken areas were 48.1 ％ and 93.4 ％ of the feedwater line, respectively. The maximum dynamic pressure was obtained inside of feedwater box that was closest to the break spool of the feedwater line. After the break of the feedwater line, propagation of the pressure wave along the flow line inside the steam generator was clearly and pertinently observed in all the tests. In terms of the reproducibility of the test results, characteristics of the dynamic pressure in both the FLB-DS-01 and the FLB-DS-02 tests showed remarkably similar trends. The maximum dynamic pressures of around 1.57 bar were measured during both tests. And the propagation times of pressure wave between the first dynamic pressure sensor and the fifth dynamic pressure sensor were 10 milliseconds and 11 milliseconds, respectively. In all the tests, the static pressure variations of the primary and secondary systems of the ATLAS were insignificant within a few seconds after the break. Based on the present experimental data, an analysis was performed using the best-estimate thermal-hydraulic system code, MARS 3.1 with an aim of qualitatively validating the test results and also evaluating the blowdown load prediction capability of the MARS 3.1 code in the simulation of steam generator feedwater line break. Although there are some discrepancies such as the maximum value and frequency of the pressure wave from a quantitative point of view, overall trends of the dynamic pressure behavior are comparable with each other.
ATLAS Double Rupture Disc Assembly Feedwater Line Break Blowdown Load
Kyoung-Ho Kang Moo-Yong Kim Hyun-Sik Park Seok-Cho Nam-Hyun Choi Sung-Won Bae Seung-Wook Lee Yeon-Sik Kim Ki-Yong Choi Won-Pil Baek
Korea Atomic Energy Research Institute 150 Dukjin-dong, Yusong-gu, Daejeon 305-353, Korea DOOSAN Heavy Industries and Construction Co., Ltd.
国际会议
上海
英文
717-729
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）