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Information × Registration Number 0223U005653, 0123U103352 , R & D reports Title Scientific and technical support at the stages of commissioning and operation of the New Safe Confinement (NSC) of the Shelter object (monitoring of fuel-containing materials) popup.stage_title Head Krasnov Viktor О., Registration Date 26-12-2023 Organization Institute for Safety Problems of Nuclear Power Plants of the National Academy of Sciences of Ukraine popup.description2  The object of the study is the thermogasodynamic and radiation state of the New Safe Confinement of the Chornobyl NPP under emergency conditions. The subject of the research is unorganized air exchange with radioactive aerosol (RA) in the main volume (MV) and annular space (AS) of the New Safe Confinement (NSC) of the Chornobyl NPP (ChNPP) with the environment under emergency conditions. The purpose of the work is to clarify and supplement the research work carried out in 2022, dedicated to the modeling of the spread of RA in the MV of the NSC, the annular space of the Arch of the NSC and emissions into the environment in 2 types of scenarios (tasks) for the analysis of the safety of the operation of the complex "NSC-SO" in the event of release of RA in the MV of the NSC and outside its borders: 1st in case of collapse of the structure of the SO and 2nd in case of fire on the roof of the turbine hall. This necessity arose because in scenario 1 it is indicated that the release of RA in the MV of the NSC during the collapse of the structure of the SO, 8 kg of RA instantly spreads into the MV, which is not realistic for the volume of the MV of 1.3 million m3. There were also two more assumptions - the absence of settling of RA, as well as the absence of heat exchange of building structures under the NSC with the air of MV. This work takes into account both the local emission of RA from the central hall of the SO, as well as the spread of RA in the MV and deposition on all surfaces under the NSC, and also takes into account the convective air flows in the MV, which transport RA from local emissions to the places of leakage of low emission of RA into the environment . To take into account the additional clarifications listed above, improved models were developed and justifications for the quantitative values of the corresponding parameters were given models. With the help of improved models, the estimated changes in the distribution of RA concentration in the MV and the Product Description popup.authors Vysotskyi Yevgenii D. Doroshenko Anatolii O. Kalynovskyi Oleksandr K. Kashpur Volodymyr O. Lagunenko Olexander S. Mykhailov Oleksandr V. Odintsov Oleksii O. Pavliuchenko Mykola I. Sabenin Pavlo V. Saveliev Maksym V. Sushchenko Kostyantyn O. Khan Valeriy Ye popup.nrat_date 2023-12-26 Close