The main parameter for assessing the status of the transport NPP core consists of the total specific activity of iodine in the primary coolant samples 2 h after the sampling. The article analyzes the variations in this parameter of the primary coolant used at the KLT-40S transport nuclear power plant. When taken in the modes of the radiation and technological control, the total specific activity of iodine isotopes in the coolant samples can differ by almost 2 times at the same status of the core. Fluctuations in the values of the parameter are determined by the variations in the activity of 132I. When selecting the parameters for assessing the status of the core, it is advisable to use the activity of 131I, 133I, 134I, 135I, or their total activity with the exclusion of 132I. During the determination of total activity by the radiometric method, iodine isotopes should either be isolated on the silver-impregnated membrane from the gas phase to remove interfering radionuclides from the load, or an additional measurement of the prepared sample activity should be performed 24 h after the sampling.
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Translated from Atomnaya Énergiya, Vol. 133, No. 5–6, pp. 305–308, November–December, 2022.
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Orlov, S.N., Zmitrodan, A.A., Fomenkov, R.V. et al. Informativity of the Status Parameters for Fuel Rod Claddings of Transport NPPs. At Energy 133, 326–330 (2023). https://doi.org/10.1007/s10512-023-01016-0
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DOI: https://doi.org/10.1007/s10512-023-01016-0