Technetium sulfide formation kinetics was studied in the pH range 8−12 in presence of Na 2 S and phosphate buffer solution. The conditions for separation of Tc sulfide micro and nanoparticles were found with ultramicrocentifugation and the values of Tc sulfide solubility were demonstrated to be dependent on the Na 2 S concentration as (Tc 3 S 10+x ) = −9 × 10 −5 ln [Na 2 S]−2 × 10 −5 M. The composition of Tc sulfide precipitate was elucidated with EXAFS, RBS and chemical analyses as Tc 3 S 10+x or [Tc 3 ( 3 -S)(S 2 ) 3 (S 2 ) 3/3 ] n in agreement with recent Lukens data.

The features for application of laser scanning of the lining geometry, the thickness measurement of the lining and the measurement of hardness with the subsequent assessment of mechanical properties to monitor the state of the pressurized volume of the containment envelope of nuclear power plants with VVER are considered.

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