ANALYSIS OF METHODS FOR CALCULATING THE RESISTANCE OF A PERFORATED SURFACE

A theoretical assessment of the resistance of the perforated surface is carried out. Modeling of the hydrodynamics of flow through a perforated surface in the computational fluid dynamics package SolidWorks Flow Simulation at different levels of the computational grid is presented

SIMULATION OF A THERMOSYPHONE-BASED PASSIVE HEAT REMOVAL SYSTEM FOR THE STORAGE PIT OF THE IVV-2M RESEARCH NUCLEAR REACTOR

A simulation of operation modes of passive heat removal system of the IVV-2M research nuclear reactor irradiated fuel assemblies’ storage pit was performed by the means of compu-tational hydrodynamics

INVESTIGATION OF THE INFLUENCE OF THE ARRANGEMENT OF VARIOUS MATERIALS IN MULTILAYER PROTECTION ON THE MULTIPLICITY OF ATTENUATION OF GAMMA RADIATION

The paper presents the results of calculating the multiplicity of attenuation of gamma radiation for various arrangements of materials in multilayer protection. The influence on the attenuation factor of the order of the layers of different materials is shown. The most effective combinations of materials have been determined.В работе представлены результаты расчета кратности ослабления гамма-излучения для различных расположений материалов в многослойной защите. Показано влияние на кратность ослабления порядка расположения слоев различных материалов. Определены наиболее эффективные комбинации материалов

DOSE COSTS OF PERSONNEL AT THE STAGES OF THE LIFE CYCLE OF FAST NEUTRON REACTORS

В работе выполнен анализ дозовых затрат персонала на этапах жизненного цикла АЭС с реакторами на быстрых нейтронах с натриевым теплоносителем.The paper analyzes the dose costs of personnel at the stages of the life cycle of nuclear power plants with sodium-cooled fast neutron reactors

Analysis of the Possibility of Using Polyimide as a Binding Matrix for Radiation-Protective Materials Filled with Depleted Uranium

The article describes the use of polyimide as a binder and the search for a technology for encapsulating depleted uranium in various compounds. The results of modeling the protective properties of a composite material by the Monte Carlo method are presented

SIMULATION AND EXPERIMENTAL STUDY OF HYDRODYNAMIC CHARACTERISTICS OF SORBENTS FOR ION-SELECTIVE TREATMENT OF LRW

Given are the results of experimental study of hydrodynamic resistance of a layer of sorbents used for cesium removal LRW. Conducted is a simulation of water flow through the sorbent layer with SolidWorks Flow Simulation program. The simulation results are com-pared with the experiments data

COMPUTATIONAL AND EXPERIMENTAL STUDIES OF HYDRODYNAMIC OPERATING CONDITIONS OF FILTER CONTAINERS FOR ION SELECTIVE PURIFICATION

The generation of radioactive waste (RW) is a specific feature of NPP operation. Liquid radioactive waste (LRW) is generated during the operation of reactor facilities, decontamination of equipment, premises and overalls. The main radionuclides in the distillation residues are 134,137Cs in the form of ions and isotopes 60Co, 54Mn in the form of complexons with substances that are used to decontaminate equipment. Among the known methods of conditioning, the largest reduction in the volume of LRW occurs with selective sorption. It is possible to increase the efficiency of using the volume of the filtering material by supplying the medium to be purified simultaneously into several layers of the sorbent. In the work, computer simulation of three proposed variants of improved designs of the filter container for ion-selective purification was carried out, which differ both in the ways of separating the flows of purified water and in the methods of their supply to the sorbent layers. All versions of the filter containers had the same cross-sectional area and height of the sorbent layers. Evaluation of the increase in the efficiency of sorption processes in the proposed designs was carried out using computer simulation in SolidWorks Flow Simulation. Three sorbents of NPP Eksorb were used. To determine the hydraulic resistance of the samples under study, a series of experimental studies of the flow through the sorbent layer was carried out. Experiments have shown that the hydraulic resistance of the layer increases in a quadratic dependence on the flow velocity, which is consistent with the Ergun equation. The obtained experimental data was added to the SolidWorks Flow Simulation engineering database to simulate the previously presented structures. Based on the simulation results, the characteristic parameters of the flow in the cavity of the filter containers were obtained. Modeling showed that, in all variants, the flow rate of the medium was distributed approximately equally among the layers. It was revealed that the third design option has the least hydraulic resistance. The chemical interaction of the filtered medium with the sorbent was not considered in the calculations. © 2022 Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University 'MEPhI'. All rights reserved