| 论文简介 |
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. |
(创新港)
