Lace containment aerosol experiments

A-1. F.J. Rahn, Summary of the LWR Aerosol Containment Experiments (LACE) Program Interim Report, LACE TR-012, Electric Power Research Institute, Palo Alto, CA, January 15, 1987. 

In a steam-containing gas flow, the presence of a significant fraction of soluble substances (e. g. CsOH) on the surfaces of the deposited aerosols will result in a drastic decrease in the degree of resuspension, even at very high gas velocities. In the Lace experiments, the measured resuspension fluxes were two to three orders of magnitude lower with mixed aersosols (MnO and CsOH) than those obtained for pure insoluble deposits (Rahn, 1988). Similarly, it was observed in these experiments that chemical effects could not be ignored. 

Rahn, F. The LWR Aerosol Containment Experiments (Lace) project Summary report. Report EPRI NP-6094-D (1988)... 

MELCOR calculated the thermal/hydraulic and aerosol response phenomena observed during the LACE LA4 ejqieriment. Figure 2.1 shows the test vessel pressure and the suspended aerosol masses predicted by MELCOR and CONTAIN, compared to experimental data. The lack of any hygroscopic effects in the MELCOR aerosol treatment is visible mostly as the lack of any calculated difference in the behavior of the hygroscopic CsOH and the nonhygroscopic MnO aerosols. MELCOR predicted aerosol particles generally larger than measured, which then settled faster than observed, and consequently less suspended aerosols were leaked and/or plated in the calculation than in the experiment. 

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