Author:
Liu Yan,Liu Xiaojing,Du Sijia,Wang Jiageng,He Hui
Abstract
AbstractThe porous Chalk River Unidentified Deposit (CRUD) depositions on the fuel cladding have a great impact on the heat transfer and power distribution of the reactor, resulting in a decrease in reactor safety and economy. In current paper, a multi-physics model is developed to simulate thermal hydraulics and boron hideout within the CRUD depositions. Processes including heat transfer, pressure drop, capillary flow, solute transport, chemical reactions and radiolysis reactions are fully coupled. The coolant flows through the capillary tubes in the porous medium and evaporates into steam at the surface of chimneys. The solute diffuses into the porous medium by capillary flow and maintains its chemical equilibrium. Chemistry and thermal hydraulics are coupled by saturation temperature that varies with solute concentrations. The new model can reasonably predict the distributions of temperature, pressure, Darcy velocity and chemical concentrations. This model shows the effect of evaporation at the chimney surface on CRUD temperature and boric acid concentration. In addition, the results show that boron hideout is caused by the accumulation of boric acid and the precipitation of Li2B4O7 at the bottom of CRUD. The influence of morphology parameters such as porosity, thickness, and chimney geometry on heat transfer and solute transport within CRUD depositions is also evaluated.
Publisher
Springer Nature Singapore
Reference20 articles.
1. Li, S., Liu, X.: Development of boron tracking and boron hideout (CRUD) model based on subchannel approach. Nucl. Eng. Des. 338, 166–175 (2018)
2. Deshon, J.: PWR axial offset anomaly (AOA) guidelines, revision 1,” EPRI, Palo Alto, CA, 1008102(3) (2004)
3. Jaiswal, A.: A numerical study on parameters affecting boric acid transport and chemistry within fuel corrosion deposits during crud induced power shift (2013)
4. Park, B.G., Seo, S., Kim, S.J., Kim, J.H., Choi, S.: Meso-scale multi-physics full coupling within porous CRUD deposits on nuclear fuel. J. Nucl. Mater. 512, 100–117 (2018)
5. Pan, C., Jones, B.G., Machiels, A.J.: Concentration levels of solutes in porous deposits with chimneys under wick boiling conditions. Nucl. Eng. Des. 99, 317–327 (1987)
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