Abstract. The author of the article analyzes existing methods for calculation of pollutants' dispersion in the atmosphere from a short continuous source under constant meteorological conditions. For this purpose the "SKAT" copyright software system elaborated by author was used. Furthermore, the author makes conclusions about advantages of using "Paskvilla method" for the calculation of gaseous substances' dispersion from sources of this type.

Abstract. In this paper, viewed thermophysical characteristics of the moderator water graphite reactor RBMK. Indicated possibilities of controlling thermal state of graphite stack by regulation composition of the purge gas. Presents experimental results, but static thermal state characteristics of graphite moderator RBMK-1000. Developed a software code for integral characteristic engineering calculations, that determine value of margin reactivity reactor RBMK-1000, in the slow transients.