Conference Proceedings Paper
MODIFICATION AND APPLICATION OF THE ATHLET-SC CODE TO TRANS-CRITICAL SIMULATIONS
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16
Shengwei Fu (Navy University of Engineering)
Chong Zhou (Shanghai Jiaotong University)
Zhihong Xu (Shanghai Jiaotong University)
Xiaojing Liu (Shanghai Jiaotong University)
Yanhua Yang (Shanghai Jiaotong University)
Xu Cheng (Shanghai Jiaotong University)
In the simulation of trans-critical transients of Supercritical water cooled reactor (SCWR), calculation will terminate because of the sudden change in void fraction across the critical point. To solve this problem, a pseudo two-phase method is proposed with a virtual region of latent heat at pseudo-critical temperatures. A smooth variation of void fraction can be realized by using liquid-field conservation equations at temperatures lower than the pseudo-critical temperature, and vapor-field conservation equations at temperatures higher than the pseudo-critical temperature. Using this method, the system code ATHLET is modified to ATHLET-SC mod 2 on the basic of the previous modified version ATHLET-SC by Shanghai Jiao Tong University. The results of tests are verified that the calculation error with the pseudo two-phase method for supercritical fluid is acceptable, when the virtual region of latent heat is kept small. Moreover, the ATHLET-SC mod 2 code is used to simulate the pressurization and depressurization process of a single flow channel with the pressure transition as well as blowdown process. The results indicate a good applicability of the modified code.
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