Large-Scale Spray Releases: Additional Aerosol Test Results (original) (raw)
The success criteria for achieving the large-scale aerosol test objectives are discussed in Table S.2. These test criteria were established in Test Plan TP-WTPSP-031, Rev. 1.0. Table S.2. Success Criteria for Large-Scale Aerosol Tests Success Criteria How Testing Did or Did Not Meet Success Criteria Criterion for Test Objectives 10 Measure the concentration and size distribution of known aqueous suspensions with the Malvern used for aerosol measurements and quantitatively compare the Malvern (Insitec-S) results with the known values to estimate the Malvern (Insitec-S) accuracy for measuring aerosols. Met: The concentration and size distribution of eight powder systems was measured and compared to known values based on material balance or list/reference properties. The eight powders included mono-and poly-disperse glass bead powders and irregular non-spherical powders. Tests with these powders evaluated concentration and size distribution accuracy under different instrument configurations (i.e., lenses and spacer bars) relevant to Phase I and Phase II testing. Furthermore, tests evaluated the accuracy of corrections made when analyzing aerosols distributed over ~400 and ~900 mm path lengths. Criteria for Test Objectives 12 and 13 Measure the droplet size distribution, total volume concentration of droplets, and total volume flow rate sprayed for each of the breaches and simulants tested. Met: Up to three Malvern Insitec-S aerosol analyzers were used to continuously measure the droplet volume concentration and size distribution during spray leak testing in the large-scale test chamber for all orifice and pressure combinations. The total volumetric flow rate of spray generated through each orifice was determined by monitoring differential loss of simulant mass from the simulant feed and storage tanks as a function of time during active spray. For in-spray measurements, measure the droplet size distribution for each of the breaches and simulants tested. Met: Three Malvern-Insitec-S aerosol analyzers were used to measure the "in-spray" size distribution of water and clay simulant sprays for all test pressure and orifice combinations. In-spray measurements involved placing the aerosol analyzers in the direct path of the spray (before it impinged on the wall downstream of the spray header and engineered breach) such that the spray passed directly through the measuring volume of the Malvern Insitec-S. This contrasts with the normal "in-chamber" aerosol configuration where the analyzers are positioned above the spray and outside of its direct path. Characterize the viscosity or rheology, PSD, bulk density, and surface tension of each simulant tested. Met: Phase II tests evaluated water and two concentrations of mixed dry clay powders (composed of 80 wt% kaolin and 20 wt% bentonite) slurried water. For these three simulants, the rheology, PSD, bulk density, and surface tension where characterized through direct measurement or through use of standard chemical references (for common properties such as the viscosity of water).
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