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Extra resources for Control of Release of Fission Products by Severe Accident (csni-r2000-9)

Sample text

Aerosols are, of course, inherently unstable. Many naturally-occurring processes act to remove aerosols and thus decontaminate the containment atmosphere. These natural processes can be augmented by engineered systems and accident management measures to cleanse the containment atmosphere more rapidly and to reduce the inventory of radioactive material that can escape the nuclear power plant as an airborne release. Modern, mechanistic analyses show, however, that radionuclide release to the containment is protracted.

Calculation of gravitation sedimentation rates is usually based on the assumption that the containment atmosphere (or, more recently, the individual compartment atmosphere) is well mixed so that the particle concentration is spatially uniform. This need not be the case. Instances where stratification of the atmosphere is possible at least in particular compartments of containments have been identified. More sophisticated models would be needed to predict accurately the gravitational sedimentation of particles from these poorly mixed atmospheres.

There is, however, an intermediate size of particle that is minimally affected by sprays. The decontamination of the atmosphere of these intermediate sized particles is increased by decreasing the size of the spray droplets, which are typically between 250 and 2000 µm in diameter. Because of the particle size dependence of spray effectiveness, the spray not only changes the concentration of particles in the atmosphere, it also changes the size distribution of these aerosols. The residual aerosol has a narrow distribution of sizes centered around the size minimally affected by the spray.

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