Study of RuO4 decomposition in dry and moist air
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Christian Mun
During a hypothetical severe nuclear accident on a pressurized water reactor (PWR), it is of primary importance to assess potential radionuclide release into the environment, and thus to better understand the volatile ruthenium tetroxide stability, in the containment building, due to its high radiotoxicity. The stability of RuO4(g) in dry and moist air, under conditions representative of a PWR containment building, is investigated. RuO4 decomposition occurs in bulk gas phase, without any specific affinity with surfaces. The kinetic rate law of RuO4 reduction is found to be dependent on the presence of steam. The humidity seems to play a catalytic role, as well as the presence of ruthenium dioxide deposits. The temperature is also a key parameter. In the presence of steam, the half-life times of RuO[4] are found to be respectively of 5 h and 9 h at 90 °C and 40 °C. A chemical reaction scheme consistent with the experimental observations is proposed.
© Oldenbourg Wissenschaftsverlag
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Artikel in diesem Heft
- Sulphate complexation of protactinium(V) at 25 °C
- Separation of actinides from fission products by extraction chromatography prior to X-ray fluorescence measurement for analytical control of a PUREX test
- Separation of actinides by extraction chromatography prior to X-ray fluorescence measurement for analytical control of a PUREX test
- The behaviour of organic solvents containing C5-BTBP and CyMe4-BTBP at low irradiation doses
- Study of RuO4 decomposition in dry and moist air
- Standardized high current solid tellurium-124 target for cyclotron production of the radionuclides iodine-123,124
- Lead (Pb) column for concentration of 99mTc-pertechnetate
- Development of [201Tl](III)-DTPA-human polyclonal antibody complex for inflammation detection
