Abstract
During the process of containment depressurization venting, a high-temperature and high-pressure carrier gas with aerosol may be released into the spent fuel pool by a multihole injector. This aerosol in the carrier gas can be removed by pool scrubbing. A small-scale pool scrubbing facility was built to study the aerosol pool scrubbing phenomenon using a multihole injector. In this study, a gaseous mixture of nitrogen and steam is used to simulate a carrier gas, and insoluble solid particles of TiO2 are used to simulate aerosols in the carrier gas. Seven tests were performed to examine the dependence of the decontamination factor (DF) on the pool depth, particle diameter, and steam mass fraction. The results show that log(1/(1–Xm)) has a linear relationship with log(DF). DF varies exponentially with the pool depth, which has an influence on the retention of aerosols with a larger particle diameter. Particle diameters in the range of 0.2–0.52 μm have little effect on the DF. For a low-depth pool scrubbing, the steam condensation mechanism is dominant and the particle diameter does not have a significant effect on the DF. Moreover, the pool scrubbing model is discussed, and an empirical correlation is proposed to evaluate the DF of a pool.
Highlights
During a severe accident in a nuclear power plant, substantial amounts of radioactive fission products are released into the containment, as aerosol is released from the degraded core with steam entrainment
Seven tests were performed in this study under the same experimental conditions except the pool depth and steam mass fraction
The larger the particle diameter, the greater the slope of the growth curve, which indicates that the pool depth has a greater influence on the retention of aerosols with a larger particle diameter (0.4–0.7 μm)
Summary
During a severe accident in a nuclear power plant, substantial amounts of radioactive fission products are released into the containment, as aerosol is released from the degraded core with steam entrainment. To improve the filtration availability of containment depressurization venting after the accident measures have been undertaken, the CAP1400 reactor uses the spent fuel pool (SFP) as a place to remove aerosols from the carrier gas injected by a multihole injector (Gao et al, 2017). When the carrier gas passes through the pool, aerosol can be removed by steam condensation, inertial impaction, gravity deposition, centrifugal deposition, and Brownian diffusion (Wassel et al, 1985; Kaneko et al, 1992). An accurate knowledge of the pool scrubbing process is necessary to evaluate the effect of the decontamination factor (DF) of the spent fuel pool (SFP) on aerosol removal
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