Abstract
As an important means of removing decay heat from containment, whether the existing water film coverage design could meet integrity requirements needs to be determined. An integral experiment is carried out to validate this by adjusting the cooling water flow and film coverage associated with the DEGB LOCA scenario. The results show that the current design could ensure the residual heat removal, inhibit the temperature and pressure rise in the containment, even the cooling water flow and film coverage as low as 50% of design values. The energy balance analysis shows that the energy in the current test is derived from the “condensation-conduction-evaporation” path at the containment shell, which undertakes 1/3–2/3 energy removal in the initial stage and almost all rest energy removal in the long-term stage. That is, the condensation and evaporation heat transfer process on the shell is the dominant factor affecting the long-term cooling of the containment incorporated steel internal containment and its passive cooling system via external surface.
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