Download presentation

Presentation is loading. Please wait.

Published byBradyn Sager Modified over 3 years ago

1
IMPACT CAPE-P: DNB Power Analysis Code for PWR FUEL Assembly - Evaluation Method - Analytical Step Calculation Method 3. Detection of DNB 1. Fuel Bundle 2. Each Subchannel 3-D Subchannel Analysis with Drift-flux Model Weismann Model, or Katto’s Model as Option 3-D Two-Phase Flow Analysis with Non-homogeneous and Non-equilibrium Two-fluid Model

2
IMPACT CAPE-P: Outline of 3-D Two-phase Flow Analysis Module Analysis Coordinate: Cartesian Coordinate Basic Equations - one pressure, non-homogeneous and non-equilibrium two-fluid model - mass, energy and three momentum conservation equations for vapor and liquid phases Constitutive Equations - Lateral lift forces acting on bubbles: Suffman force, Wall effect force and Bubble dispersion force. Model coefficients were given by empirical correlations. - Turbulence Model: Sato model The eddy viscosity induced by bubbles was considered. - Interfacial drag force: Andersen model (C 0,V gj : Ishii model) - Interfacial heat transfer coefficient: Plesset and Zwick model for Saturated boiling and Unal model for Subcooled boiling

3
Fuel rod Core region Bubbly layer IMPACT CAPE-P: Outline of DNB Evaluation Module (Weisman Model) A bubbly layer is formed by build-up of bubbles near the wall, under subcooled boiling condition. DNB occurs when a void fraction of the bubbly layer exceeds the critical value. In the calculation, nearest meshes from the wall are defined as a bubbly layer. Heated wall Bubbly layer Core region bubble

4
IMPACT CAPE-P: Verification of Two Phasae Flow Analysis Model (1) NUPEC Test - Void Distribution in Single Channel - Single channel void distribution tests under PWR conditions by NUPEC - Horizontal void distributions were measured. - Heated length : 1.825m, Measurements : 1.400m from the bottom Test Vessel (Titanium Alloy) Heater (Inconel) Measurement 0.5 1.0 0.0 Void Fraction Insulator (Alminum)

5
IMPACT CAPE-P: Verification of Two Phase Flow Analysis Model (2) Result of Void Distribution at High Pressure Pressure: 14.7 MPa Mass Flux: 5.0 10 6 kg/m 2 h Power: 60 kW Inlet Temperature: 573 K 3-D Analysis Result Measured Higher Void Fraction 0.4 0.5 0.6

6
IMPACT CAPE-P: Verification of Two Phase Flow Analysis Model (3) Result of Void Distribution at Low Pressure 3-D Analysis Result Measured Pressure: 4.9 MPa Mass Flux: 5.0 10 6 kg/m 2 h Power: 80 kW Inlet Temperature: 573 K 0.6 0.4 0.8 Lower Void Fraction

7
9.5mm 12.6mm IMPACT CAPE-P: Validation by NUPEC Full Length 5 5 Test Analysis (1) NUPEC Test Apparatus and Analysis Region Heated Length: 3.658 m Grid Spacer with Mixing Vanes 12.6 mm 9.5 mm : High Power Rod (pf=1.0) : Low Power Rod (pf=0.85) Subchannel Analysis Region 3-D Two-phase Flow Analysis Region

8
Number of Grids: 12 12 135=19440 : with porous Mesh arrangement of XY section fuel rod 135 grids IMPACT CAPE-P: Validation by NUPEC Full Length 5 5 Test Analysis (2) Grid Model of Three-Dimensional Two-Phase Flow Analysis

9
IMPACT 7.0 Calculated DNB power (MW) Measured DNB power (MW) Average difference: -4.9% =6.7% (Standard deviation) Pressure: 7.35-16.6 MPa Mass flux: 2-14 10 6 kg/m 2 h Inlet subcooling: 126-502 kJ/kg 6.0 5.0 4.0 3.0 2.0 1.0 0 2.03.0 4.05.06.07.0 Test Bundle: 5 5 Full scale CAPE-P: Validation by NUPEC Full Length 5 5 Test Analysis (3) Analysis Result

10
1000 2000 3000 4000 5000 6000 7000 04812 16 Pressure (MPa) DNB Power (kW) IMPACT CAPE-P: Validation by NUPEC Full Length 5 5 Test Analysis (4) Pressure Effect on DNB Power : Measured : Calculated

11
1000 2000 3000 4000 5000 6000 7000 02468101214 16 Mass Flux ( 10 6 kg/m 2 h) DNB Power (kW) IMPACT CAPE-P: Validation by NUPEC Full Length 5 5 Test Analysis (5) Effect of Mass Flux on DNB Power : Measured : Calculated

12
0 1000 2000 3000 4000 5000 6000 7000 100200 300400 500600 Inlet Subcooling (kJ/kg) DNB Power (kW) IMPACT CAPE-P: Validation by NUPEC Full Length 5 5 Test Analysis (6) Effect of Inlet Subcooling on DNB Power : Measured : Calculated

Similar presentations

Presentation is loading. Please wait....

OK

INTRODUCTION TO CONVECTION

INTRODUCTION TO CONVECTION

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google

Oppt one people's public trust Free ppt on uses of water Ppt on computer science department portal Ppt on viruses and bacteria lesson Microsoft office ppt online viewer Ppt on adr and gdr Ppt on power line communication chip Ppt on object-oriented concepts Word to ppt online converter free 100% Mis ppt on nokia cell