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Characterization of irradiated graphite in terms of  14 C activity is crucial for the optimization of treatment technology: geological disposal, landfill storage, recycling, etc. The main contributor to  14 C generation in the RBMK reactor graphite is  14 N(n, p) 14 C reaction. The generation of carbon isotopes  13 C and  14 C in the virgin RBMK graphite samples irradiated at the LVR-15 research reactor (Research Centre Řež, Ltd.) were investigated in order to obtain the impurity concentration level of  14 N. Afterwards the modeling of graphite activation in the RBMK-1500 reactor was performed by computer code MCNP6 using obtained  14 N impurity concentrations and new nuclear data libraries. The irradiation parameters – neutron fluence have been checked by method based on coupling of stable isotope ratio mass spectrometry and computer modelling. The activity of  14 C in the different constructions of irradiated graphite of the RBMK-1500 reactor has been measured by the β spectrometry technique (LSC) and has been compared with the simulated one. Obtained results have indicated the importance of  14 C production from  14 N in the RBMK-1500 reactor and in the LVR-15 neutron spectrum. Measured  14 C specific activity values in the samples varied from 130-700 kBq/g in the RBMK-1500 irradiated samples and from 3-12.5 Bq/g in the LVR-15 irradiated graphite samples. This corresponds to 15±4 - 80±10 ppm impurity of  14 N in various graphite samples of RBMK reactor.

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ESTIMATION OF THE GENERATION OF 13C AND 14C IN THE REACTOR GRAPHITE USING MCNP6 MODELLING, ISOTOPE RATIO MASS SPECTROMETRY AND 14C MEASUREMENT TECHNIQUE