Local effect model development for the steam generator three dimensional thermal hydraulics analysis code

Abstract

The thermal hydraulic characteristics of steam generator secondary side in pressurized water reactor has been always a research hot point in the literatures. The detailed three dimensional thermal hydraulic parameters distribution in steam generator is very important for the reactor safety and economy. A three-dimensional two-phase analysis program STAF for the secondary side of steam generator has been developed by NuTheL at Xi'an Jiaotong University. The program is based on porous medium model and four-equation drift flow model. It can simulate the flow and heat transfer characteristics of steam generator. However, due to the limitation of porous medium model, STAF are not functional to obtain the local velocity distribution near the supporting plate and anti-vibration bars, which are very important for fouling deposition and flow vibration analysis. In this paper, the local detailed thermal hydraulic characteristics near steam generator supporting plate and anti-vibration bars are studied. The local flow field is obtained and the influence range and degree of local components on the velocity distribution is analyzed. The supporting plate and anti-vibration bars analysis model was developed and implemented into the STAF code. Results show that the improved code could predict the local velocity variations compared with the original code. This work is meaningful for the function promotion of steam generator thermal hydraulic code STAF.