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Information × Registration Number 0216U005342, 0113U004290 , R & D reports Title Monitoring the integrity of the fuel elements in the work of the research reactor WWR-M low -enriched fuel popup.stage_title Head Tryshyn Volodymyr, Кандидат фізико-математичних наук Registration Date 22-01-2016 Organization Institute for Nuclear Research of National Academy of Sciences of Ukraine popup.description2 The object of investigations is the radionuclide activities in the coolant of primary cooling circuit (CPC) of the WWR-M reactor and the nuclear and physical parameters of new fuel assemblies (FA) of the WWR-M2 type with the enrichment of 19.7% for U-235 isotope, which are used at the modernized research reactor of the Institute for nuclear research NAS of Ukraine and the nuclear subcritical installation "Neutron source" of the Kharkov PTI. The goal of this work is the investigation of dynamics of the reference radionuclide activity in CPC of the WWR-M reactor for the development of safe operation criteria of the reactor core composed by new FA. The project was implemented by means of the radiometry and radiochemistry methods as well as the high-resolution alpha- and gamma-spectrometry. As the result of the technical characteristics analysis it was selected, ordered and supplied the hard-ware and soft-ware for the stationary gamma-spectrometry complex, which is oriented on the permanent control of the reference radionuclide activity in the range from 10-3 to 3.7 10-7 Bq/l in CPC. The reconstruction of bypass line for the CPC circulation was performed; the fact of intense sorption on the inner surface of pipe-lines was taken into account. The stationary installation for the permanent measurements and gamma-spectra treatment at the reactor operation with nominal power was assembled and tested in the technological premises of reactor. The selected hard-ware and soft-ware are aimed for the practical implementation of new FA input control, in particular, for the measurements of Uranium enrichment and uniform distribution of U-235 along the core of hexahedral fuel element. The character and contamination value caused by U-235 radionuclides on the surface of new FA were investigated by means of the radiometry, radiochemistry and alpha-spectrometry methods. The background conditions for the monitoring of the fuel rods depressurization were investigated after the loading of new FA into reactor core. The monitoring of the reactor power during one week of operation after long-term break was performed on the activity of N-16 radionuclide in CPC; the spectrometer efficiency calibration by means of the CPC gamma-spectra at the reactor operation with the nominal power during one week was performed; 96 files with the CPC spectra were collected and archived during one week of the reactor operation. CORE, NUCLEAR REACTOR, RADIONUCLIDES, FISSION PRODUCTS, COOLANT, CONTROL, IMPERMEABILITY, IODINE, SPECTRUM, DETECTORS, GAMMA-RAY, SPECTROMETRIC COMPLEX, THE FIRST CIRCUIT, BYPASS LINE, ANALYZERS, SOFTWARE. Product Description popup.authors Балакін В.Д. Гайдар О.В. Жуков О.П. Завада М.В. Малюк І.А. Рудик О.Ф. Саженюк А.Д. Сваричевська О.В. Тришин В.В. popup.nrat_date 2020-04-02 Close