Scientific and Technical Center for Nuclear and Radiation Safety

Moscow, Russia

Scientific and Technical Center for Nuclear and Radiation Safety

Moscow, Russia
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Belova E.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Nazin E.R.,Scientific and Technical Center for Nuclear and Radiation Safety | Skvortsov I.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Sokolov I.P.,Scientific and Technical Center for Nuclear and Radiation Safety | And 3 more authors.
Radiochemistry | Year: 2016

The effect of HNO3 on the thermal stability and radiation resistance of trifluoromethyl phenyl sulfone (FS-13) used as extractant diluent in high-level waste partitioning was studied. Heating of FS-13 in the presence of 14 M HNO3 is not accompanied by exothermic effects up to 160°С. The amount of gaseous products released in the course of heating the system consisting of FS-13 and HNO3 and the composition of the major radiolysis products of the system components at irradiation doses of up to 0.5 MGy were determined. © 2016, Pleiades Publishing, Inc.


Nazin E.R.,Scientific and Technical Center for Nuclear and Radiation Safety | Zahinyaev G.M.,Scientific and Technical Center for Nuclear and Radiation Safety | Belova E.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Tkhorzhnitskii G.P.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Ryabova E.V.,Scientific and Technical Center for Nuclear and Radiation Safety
Radiochemistry | Year: 2010

The thermal stability of mixtures of tri-n-butyl phosphate (TBP) with HNO3 was studied in the temperature range from 90 to 125°C. In mixtures with the irradiated extractant at 110°C, intense exothermic processes initiated by oxidation of extractant radiolysis products are possible, whereas at 90°C oxidation of the irradiated extractant is accompanied by weak heat and gas evolution. In the temperature range from 110 to 120°C, exothermic oxidation processes in nonirradiated mixtures start after long induction period (hours), develop gradually, and do not have an avalanche character. Below 110°C, heating of mixtures of the extractant with HNO 3 at the HNO3 concentration from 8 to 15.7 M is accompanied by gas evolution without exothermic effects. On the whole, oxidation processes in extraction mixtures at temperatures below the "start" parameters of thermal explosion are not dangerous from the viewpoint of the probability of thermal explosion, even at prolonged heating. © 2010 Pleiades Publishing, Ltd.

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