Steam Generator Void Fraction Level

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Modelling Steam Generators for Sodium Fast Reactor …

2009-10-2 · - D is the void fraction (ratio of volume occupied by steam on total volume of fluid). Moreover, we have the relation : Um DU v (1 D)Ul (4) where v and l indicate respectively the vapor and liquid phase - L is the difference of enthalpy between vapor and liquid at saturation condition for a given pressure

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Experiments of Two-phase Flow Dynamics of Marine …

of reactor components such as the steam generator. Ship motion will affect the operating variables, e.g. of the steam generator secondary circuit such as the water level and exit flow rate (single-phase) of the downcomer, and the void fraction and exit flow rate (two-phase) of the evaporator.

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PORFLO Simulations of Loviisa Horizontal Steam Generator

2020-2-18 · horizontal steam generator was developed for PORFLO, a three-dimensional flow solver developed at and the steady-state results of a full power level (250 MW) simulation are presented and compared to analogous Fluent simulations conducted in project SGEN. α Void fraction (vapor fraction of fluid volume) [-]

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THREE-DIMENSIONAL POROUS MEDIA MODEL OF A …

The steady state full power operation of the steam generator is solved. The calculated result is compared to void fraction and flow velocity measurements at a few points. The shape of the surface level is compared to observations. 1

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THREE-DIMENSIONAL POROUS MEDIA MODEL OF A …

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A three-dimensional porous media model has been implemented for the secondary side of the horizontal steam generator of a VVER-440 plant by using the ANSYS FLUENT 12.0 code. The primary circuit is solved with the APROS system code and the outer wall temperatures are interpolated to the CFD model.

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HEAT RECOVERY STEAM GENERATOR & BOILER …

2015-2-12 · gas and steam side of a heat exchanger. Modeling of the complete system, including super-heaters, economizers, evaporators, pumps, turbines, etc. Adaptable modeling approach accor- ding to the required level of detail. Assists in proper and economical design for the expected operational conditions. Steady-state design Detection of unwanted

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Chapter 2 Design and Operation of a Pressurised Water …

2015-10-20 · Chapter 2 Design and Operation of a Pressurised Water Reactor 2.1. General information about reactor operation The nuclei of some isotopes contained in nuclear fuel, such as 235U and 239Pu, can split up (fission) into two1 smaller fragments called "fission products". These fragments have

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Horizontal steam generator thermal hydraulic …

Description of void fraction contours and distribution of averaged void fraction in the vicinity of the hot and cold legs at the different elevations are shown in Fig. 10, Fig. 11, Fig. 12, Fig. 13. In addition to higher value of the vapor volume fraction at the hot side of the steam generator, it is observed that the void fraction increases

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Date: Engineering & Projects Organization

2018-11-14 · - Case 2: Design Basis Steam Generator Tube Rupture accounting for all operator actions,. The purpose of this analysis is to analyse the amount of releases from the affected steam generator, when modelling properly all relevant operator actions. - Case 3: Realistic Steam Generator Tube Rupture taking only credit of manual reactor trip.

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(PDF) Validation of the STEG code using PGV …

Void fraction and superficial steam velocity. Uniform SPS and uniform steam supply (mass flow rate 7.2 t/h, water level above SPS 0.218 m). (a) TRACE model, (b) Simovic model.

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CFD-SIMULATION OF THE VVER-440 STEAM GENERATOR …

2010-5-7 · with different equations for CD depending on the void fraction [2]. The symmetrical drag model of ANSYS FLUENT was also tested. In the comparisons made between the two models, the model presented above produced more realistic void fraction distribution throughout the steam generator in addition to a realistically shaped water surface level.

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Water Hammer_

2011-9-1 · The timing of the pressure pulses appeared to be well predicted; however the stability of the solution was dependent on initial void fraction and initial dissolved air fraction. Upstream Reservoir Initial flow direction Closes at t=0 Downstream Reservoir 8.0 MPa Section of interest Valve Figure 1: Definition of benchmark exercise BM1: fast closure of a valve.

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Credit: 2 PDH - Certified Training Institute

2018-8-22 · steam generator at 588 603 K on the hot-leg side and leaves at about 560 K on the cold-leg side. if the level is too high, the steam exiting the steam generator would carry water droplets (the void fraction would be higher than

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PWR steam generators - PDF Free Download

Development of CUPID-SG for the analysis of two-phase flows in PWR steam generators Finite element prediction of differential eddy current probe signals from Fe3O4 deposits in PWR steam generators

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MELCOR Application to the Analysis of SMR

2020-1-9 · SMR Steam Generator 6-7/04/2016 7 Problem can be partly remedied by changing the void fraction limit (sensitivity coefficient SC 4407, item 11): default: α MAX = 0.40 changed to: α MAX = 0.95 New results: no CHF. However, heat flux is still overestimated, by about factor of 2. Node 168: q = 0.73 MW/m2 (close to CHF) Q/A = 0.36 MW/m2

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THREE-DIMENSIONAL POROUS MEDIA MODEL OF A …

The steady state full power operation of the steam generator is solved. The calculated result is compared to void fraction and flow velocity measurements at a few points. The shape of the surface level is compared to observations. 1

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CFD-SIMULATION OF THE VVER-440 STEAM GENERATOR …

2010-5-7 · with different equations for CD depending on the void fraction [2]. The symmetrical drag model of ANSYS FLUENT was also tested. In the comparisons made between the two models, the model presented above produced more realistic void fraction distribution throughout the steam generator in addition to a realistically shaped water surface level.

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Credit: 2 PDH - Certified Training Institute

2018-8-22 · steam generator at 588 603 K on the hot-leg side and leaves at about 560 K on the cold-leg side. if the level is too high, the steam exiting the steam generator would carry water droplets (the void fraction would be higher than

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Horizontal Steam Generator Thermal-Hydraulics at …

Presented results show water and steam mass flow rate vectors, steam void fraction spatial distribution, recirculation zones, swell level position, water mass inventory on the shell side, and other important thermal-hydraulic parameters. The simulations have been performed with the computer code 3D ANA, based on the "two-fluid" model approach.

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Nuclear Power Generation - Flownex Simulation …

2020-6-24 · U-tube steam generator: calculation of recirculation rate, void fraction, feedback to primary cycle, temperatures and pressures. Once-through steam generator: calculation of boiling rates, dry out position, metal temperatures; sizing of flow distribution orifices for boiling stability

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