Estimation of conditions of self-ignition of dried anion-exchange resins in nitrate form

Authors:   Rodin A. V., Shelamov K. V., Gezalyan L. V., Ponizov A. V., Sharafutdinov R. B. Issue:   3 (109) – 2023.
Estimation of conditions of self-ignition of dried anion-exchange resins in nitrate form.

Rodin A. V., Shelamov K. V., Gezalyan L. V., Ponizov A. V., Sharafutdinov R. B.

Up to date, a large amount of radioactive waste in the form of spent ion-exchange resins has been accumulated at nuclear power plants, and their disposal in protective containers is of practical interest now. However, it is necessary to estimate the possibility of spontaneous combustion of such resins. For this purpose, thermal effects occurring during the heating
of AV-17-8 and Tokem-845 anion-exchange resins were studied using the differential scanning calorimetry. The method of gas chromatography-mass-spectrometry was used to determine gaseous compounds formed during the decomposition of the studied resins. It was determined that exothermic effects are not observed when resins in chloride form are heated, unlike the resins in nitrate form. Kinetic parameters of the heat release processes were evaluated for Tokem-845 resin, which decomposes
at a lower temperature and therefore presents a greater fire and explosion hazard than AV-17-8 resin. Based on these parameters, calculations were made to determine the possibility of a thermal explosion occurring in the disposal container.

► Keywords: radioactive waste, anion-exchange resins, thermal effects, spontaneous combustion (self-ignition), decomposition products.

Article language: Russian. Pp. 5–19. [in Russian]. DOI: 10.26277/ SECNRS.2023.109.3.001.

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