Stripping of Pu and Tc from tributyl phosphate solutions with carbohydrazide

Stripping of Pu from 30% tributyl phosphate solutions with carbohydrazide was studied. The degree of the Pu stripping drastically decreases with an increase in acidity and increases with an increase in the carbohydrazide concentration and in temperature. The Pu(IV) reduction rate in the two-phase system is sufficiently high to perform the reductive stripping of Pu with carbohydrazides both in mixer-settlers and in centrifugal extractors. Stripping of Tc at high phase ratio (O/W = 30) with carbohydrazide, hydrazine, and U(IV) in a mixture with hydrazine was studied. At low acidity (<1 M HNO₃) and 30?C35°C, carbohydrazide allows more than 80% stripping of Tc from 30% TBP solutions even at high volume ratio of the phases.     

Selecting a retrofitting profile for the TGME-444 boiler at the Rostov TETs-2 cogeneration station

Hydraulic misalignments in the steam superheating surfaces and possible changes in the thermal circuit of a TGME-444 boiler are analyzed, and the retrofitting version of this boiler that was drawn up from the results of this analysis and implemented at the Rostov TETs-2 cogeneration station in 2007 is presented. The improvement in the operational reliability of the retrofitted boiler is demonstrated.     

Numerical realization of the three-dimensional model of hydrodynamics for shallow water basins on a high-performance system

The paper is dedicated to the development and application of the 3D shallow water hydrodynamics model. Parallel realization of the deepest descent the symmetric successive over relaxation (SSOR) algorithm is presented for solving finite-difference equations obtained after discretization of the initial problem. Estimates for speeding up and increasing the efficiency of the parallel algorithm are given, and the flow velocity distribution for the Azov Sea (South of Russia) and the Lagoon Etang de Berre (South of France) are presented.