Development of radioecological model for accidental radionuclide release: akkuyu and sinop nuclear power plants

Ünver, Latife Özge
A dynamic dose model has been developed to estimate radiation doses and stochastic risks due to atmospheric discharges of radionuclides in the case of a nuclear reactor accident. In addition to individual doses from different pathways for different age groups, collective doses and stochastic risks can be calculated by the model. The model can be coupled to any long-range atmospheric dispersion model which can calculate radionuclide concentrations in air and on the ground at predetermined time intervals or measurement data. Since the Chernobyl accident, there had been an increase in real world data to assess the capabilities of software, which are developed to calculate radionuclide concentrations in the environment and doses to human. Therefore, data related to Chernobyl accident was used to validate the developed software. The validated software was then used to calculate radiological consequences in the case of hypothetical severe accidents at Akkuyu and Sinop NPPs in Turkey. The accident scenario was based on Fukushima Daiichi NPP accident. The newly developed software was run for different release times, and it was turned out that meteorological pattern as well as vegetation cycles of the plants were influencing doses to humans. The doses incurred due to a severe accident at Akkuyu NPP were calculated as 3.374 mSv 1 year after the accident, and the lifetime doses will be 9.706 for adults having average habits; the doses in the case of Sinop NPP accident have been found out to be more than that of Akkuyu NPP accident. Cs-134, Cs-137 and I-131 were identified as the most dose contributing isotopes, and cereals, cow milk, chicken, fruits, lamb, beef, fruit vegetables and root vegetables were the most dose contributing foods respectively. For the maximum deposited grit found out as a result of simulation of Akkuyu NPP accident, and for the related parameters of most dose contributing isotopes and foodstuffs, uncertainty analysis was performed by LHS to predict uncertainties in the doses and activity concentrations. Furthermore, sensitivity analysis was also conducted by again LHS of the aforementioned parameters and the outputs were processed by correlation techniques to find out most influencing parameters on lifetime and short-term doses. It can be concluded that soil-plant transfer factors for Cs have a big influence on the lifetime dose results, feed-animal transfer factor for Cs for cow milk and reduction factors for external radiation, beef and grain consumption amounts have also the high effect on lifetime doses. For the short term doses, cow milk transfer factor for iodine and interception factor for the grass are also influential parameters.


Development of a radioecological model for accidental release of radionuclides
Unver, O.; Kocar, C.; Tuncel, G. (Carl Hanser Verlag, 2020-10-01)
A dynamic radioecological model was developed to estimate radiation doses and stochastic health risks due to atmospheric releases in case of a nuclear reactor accident. Activities in some foodstuffs, feedstuffs and grass, and doses from different pathways for age groups and stochastic risks can be calculated by the model. Dynamic features include food harvesting, sowing times, feeding regimes, and the growing up of a person. The model can be coupled to any atmospheric dispersion model which can calculate ra...
Use of Al(2)O(3) layer as a dielectric in MOS based radiation sensors fabricated on a Si substrate
YILMAZ, ERCAN; Dogan, Ilker; Turan, Raşit (Elsevier BV, 2008-11-01)
The use of Al(2)O(3) dielectric in MOS based radiation sensors has been investigated. Their response has been compared with conventional MOS capacitors with a SiO(2) dielectric. The study includes gamma radiation effects with dose up to 4 Gy. The effect of radiation has been determined from the valance band shift in CV curves. The amount of charge induced by the radiation has been calculated and compared with the response of MOS capacitors with SiO(2) with the same and different thicknesses. Fading properti...
Impact of composition modification induced by ion beam Coulomb-drag effects on the nanoindentation hardness of HT9
Gigax, Jonathan G.; Kim, Hyosim; Aydoğan Güngör, Eda; Price, L. M.; Wang, X.; Maloy, S. A.; Garner, F. A.; Shao, L. (Elsevier BV, 2019-04-01)
Accelerator-based ion irradiation is commonly used to simulate neutron damage, in lieu of neutron irradiation due to limited availability of fast flux facilities and little to no activation of the samples. Neutron atypical effects, however, must be recognized and their impact minimized in order to achieve the most accurate microstructural evolution under ion bombardment. Mechanical property changes, which arise from the synergy of numerous radiation-induced changes, are especially susceptible to these neutr...
Measurement of the inelastic cross section in proton-lead collisions at root s(NN)=5.02 TeV
Khachatryan, V.; et. al. (Elsevier BV, 2016-08-01)
The inelastic hadronic cross section in proton-lead collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV is measured with the CMS detector at the LHC. The data sample, corresponding to an integrated luminosity of L = 12.6 +/- 0.4 nb(-1), has been collected with an unbiased trigger for inclusive particle production. The cross section is obtained from the measured number of proton-lead collisions with hadronic activity produced in the pseudorapidity ranges 3 < eta < 5 and/or -5 < eta < -3, corre...
Use of poly(methyl methacrylate) in radioactive waste management: I. Radiation stability and degradation
Ozdemir, T.; Usanmaz, Ali (Elsevier BV, 2009-03-01)
In this study, in order to understand the possible use of PMMA in radioactive waste management as a solidifying agent, radiation stability of the PMMA was studied by gamma irradiations at two different dose rates of 1485 and 82.8 Gy/h. The total dose of irradiation was up to 523 kGy. Degradation nature was tested by studying the changes in mechanical and thermal properties with rate and total dose of irradiation. Ultimate tensile strength and toughness first increased and then decreased with total irradiati...
Citation Formats
L. Ö. Ünver, “Development of radioecological model for accidental radionuclide release: akkuyu and sinop nuclear power plants,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.