MODELS OF RADIONUCLIDES TRANSPORT IN ATMOSPHERE FROM INTEGRATED SOFTWARE PACKAGE «NOSTRADAMUS» (PREPRINT IBRAE NSI-31-94)

Preprint IBRAE NSI-31-94

Arutunjan R.V., Bolshov L.A., Belikov V.V., Belikova G.V., Goloviznin V.M., Fokin A.L, Kanevsky M.F., Peschany S.E., Semenov V.N., Shilkova S.V, Sorokovikova O.S., Starodubtseva L.P.

The characteristics of the radionuclides transport model imbedded into the NOSTRADAMUS integrated software package of the Nuclear Safety Institute are described.

Bibliographical reference

Arutunjan R.V., Bolshov L.A., Belikov V.V., Belikova G.V., Goloviznin V.M., Fokin A.L, Kanevsky M.F., Peschany S.E., Semenov V.N., Shilkova S.V, Sorokovikova O.S., Starodubtseva L.P. MODELS OF RADIONUCLIDES TRANSPORT IN ATMOSPHERE FROM INTEGRATED SOFTWARE PACKAGE «NOSTRADAMUS». Preprint NSI-31-94. Moscow. Nuclear Safety Institute. September 1994. 23 p. – Refs.: 33 items

The mesoscale transport model based on the mixed techniques of randomly migrated gauss clouds which is designed in Institute. The model embraces as its particular cases: the standard method of point object random displacements; the PUFF-method, i.e. the regular transport of gauss clouds in a wind field. The mixed techniques of randomly migrated gauss clouds in nonuniform wind field designed in the Institute takes a great advantage in computation time over the point random displacement methods without appreciable loss of precision. Test runs of the model show its performance to be several tenth times better.

There are several models of a source of contamination. The package includes some local models of contamination transport over a fire or an explosion. For these processes the contamination distribution can embrace several km in height. Over this height interval the wind can be directed differently. In this case the approximation formulas of Brigs give only very rough assessment. Some verification and validation results are presented.