发布时间：2025-04-30

论文名称：The stability-analysis code FIAT development for density wave oscillations and its application to PV/PT SCWR

发表刊物：Annals of Nuclear Energy

摘要：SuperCritical Water Reactor owns a high operation pressure and a wide coolant temperature range. The thermo-physical properties and transport properties of the coolant in the core would change greatly both in the operation condition and startup process, which may causes density wave oscillations. In this paper, a stability analysis code named FIAT is developed based on frequency domain method to analyze the density wave oscillations (DWO) for SCWR. Frequency domain method and assumptions of constant pressure drop between core inlet and outlet are applied in the code. The neutron/thermal-hydraulic coupling characteristic equation is derived through using linearization and laplace transformation for the mass, momentum and energy conservation equations. With analyzing the characteristic equation, the onset of DWO instabilities can be confirmed with non-dimensional parameters plane. The prediction accuracy of the FIAT code is verified through experiment data and code-to-code comparison under subcritical and supercritical pressure. The FIAT code is applied to evaluate the effects of basic core model on the stability for pressure vessel type SCWR and optimize the startup procedure for pressure tube type SCWR. The results show that for pressure vessel type SCWR, fuel rods heat transfer model and neutron kinetics model help stabilize the system while water rods model produces an opposite effect. For pressure tube type SCWR, two pressurization phases are required during sliding pressure start-up process to meet both the thermal–hydraulic and stability requirements.

合写作者：Pan Wu; Yuan Yuan; Junjie Pan; Jianqiang Shan

卷号：Volume 110

页面范围：833-846

是否译文：否

发表时间：2017-12-05