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Analysis Of Passive Heat Removal Systém Trough Steam Generator By Ansoft Fluent
Petrosyan, Taron
This paper presents the simulation of the condensation of water vapor in one tube of the heat exchanger in the Passive Heat Removal System, which is a protective safety system of the Nuclear Power Plant. The simulation accounts for the turbulent flow of the gas along the tube with an assumption of constant wall temperature. The results from the CFD (computational fluid dynamics) simulations are compared with the experimental results from the literature for the condensation of water vapor and in general, agree well.
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Analysis Of Passive Heat Removal System
Through Steam Generator
Petrosyan, Taron
In the current study, the model of Passive Heat Removal System (PHRS) through Steam Generator (SG) was developed for computational fluid dynamics (CFD) analysis. During work there was done three main tasks, which are creating geometrical form of PHRS, meshing of model to achieve a better analysis of thermal-hydraulic phenomena and creating domains for simulation steam condensation in PHRS SG heat exchanger tubes. Analysis through the "ANSYS CFX" software, with two different cases investigated at the steam inlet velocity of 1 m/s and 3 m/s. A thorough description of the steam condensation process in the passive cooling system obtained as a result of the analysis. The rate of the steam condensation in heat exchanger pipeline was assessed.
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Stanovení C-14 ve vzorcích listů z okolí jaderných elektráren
Světlík, Ivo ; Tomeš, Marek ; Brabcová, Kateřina ; Michálek, V. ; Tomášková, Lenka
Carbon-14 is a radionuclide with global occurrence and partly natural origin. This radionuclide is a pure beta emitter with half-live 5730 years. The greatest present artificial source of radiocarbon are effluents from nuclear energy facilities, even though it is minor contribution in comparison with natural production. From all radionuclides released by Nuclear Power Plants (NPP) with Light Water Pressurized Reactor (LWPR) during normal operation, radiocarbon is responsible for major collective effective dose. During 2002 and 2003 samples of biota were collected in NPPs Temelín and Dukovany vicinity (both NPPs have only LWPR) and in reference background localities. Received results are compared and discussed in the point of view of NPPs influences on C-14 amount in the environment of close vicinity
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