[en] Pool scrubbing, the removal of aerosol particles by bubbling contaminated gases though a water pool, could be a significant mechanism in limiting the severity of certain reactor accidents. BUSCA is a computer code designed to model bubble thermal-hydraulics and associated pool scrubbing removal processes. This paper describes the enhancements made to the code since the Palo Alto CSNI conference in 1986. BUSCA now has the ability to model effects of different bubble shapes, bulk condensation, bubble breakup, and bubble cluster and plume rise conditions. A series of sensitivity tests have been included to assess the significance of these additions on decontamination factor (DF) calculations. DFs are seen to increase with, (i) increasing initial mole fraction of steam in bubble, (ii) reduction of the initial bubble size, (iii) reduction of the pool temperature, (iv) increasing the initial temperature difference between the pool and the bubble, (v) increasing the pool depth, (vi) increasing the solubility of the aerosol particles. While a reduction in DFs can be brought about by assuming the bubbles rise as a plume rather than as individual bubbles. (orig./HP)