scholarly journals Space and temporal evolution of density wave oscillations in multi-phase flow channels of boiling water reactors

2015 ◽  
Author(s):  
J. L. Munoz-Cobo ◽  
A. Escrivá ◽  
M. D. Domingo
Keyword(s):  
Temporal Evolution ◽  
Density Wave ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Phase Flow ◽  
Flow Channels ◽  
Multi Phase Flow ◽  
Water Reactors ◽  
Multi Phase ◽  
Density Wave Oscillations

Generative adversarial networks for dual-modality electrical tomography in multi-phase flow measurement

Measurement ◽  
2020 ◽  
pp. 108608
Author(s):  
Zihan Xia ◽  
Ziqiang Cui ◽  
Yuxiang Chen ◽  
Yafeng Hu ◽  
Huaxiang Wang
Keyword(s):  
Flow Measurement ◽  
Generative Adversarial Networks ◽  
Phase Flow ◽  
Electrical Tomography ◽  
Dual Modality ◽  
Adversarial Networks ◽  
Multi Phase Flow ◽  
Multi Phase

Evaluation of the impact of multi-phase flow on reservoir signatures in the Wolfcamp shale

2020 ◽  
Vol 76 ◽  
pp. 103187
Author(s):  
C.R. Clarkson ◽  
B. Yuan ◽  
Z. Zhang ◽  
F. Tabasinejad ◽  
H. Behmanesh ◽  
...  
Keyword(s):  
Phase Flow ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

Recirculation Pump Speed Control System Upgrades in Nuclear Boiling Water Reactors

2008 ◽  
Author(s):  
James W. Morgan
Keyword(s):  
Control System ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Flow Control ◽  
Nuclear Power ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Pump Speed ◽  
Water Reactors ◽  
Generator Sets

The nuclear power industry is faced with determining what to do with equipment and instrumentation reaching obsolescence and selecting the appropriate approach for upgrading the affected equipment. One of the systems in a nuclear power plant that has been a source of poor reliability in terms of replacement parts and control performance is the reactor recirculation pump speed/ flow control system for boiling water reactors (BWR). All of the operating BWR-3 and BWR-4’s use motor-generator sets, with a fluid coupled speed changer, to control the speed of the recirculation water pumps over the entire speed range of the pumps. These systems historically have had high maintenance costs, relative low efficiency, and relatively inaccurate speed control creating unwanted unit de-rates. BWR-5 and BWR-6 recirculation flow control schemes, which use flow control valves in conjunction with two-speed pumps, are also subject to upgrades for improved performance and reliability. These systems can be improved by installing solid-state adjustable speed drives (ASD), also known as variable frequency drives (VFD), in place of the motor-generator sets and the flow control valves. Several system configurations and ASD designs have been considered for optimal reliability and return on investment. This paper will discuss a highly reliable system and ASD design that is being developed for nuclear power plant reactor recirculation water pump controls. Design considerations discussed include ASD topology, controls architecture, accident, transient and hydraulic analyses, potential reactor internals modifications, installation, demolition and economic benefits.

The Steam Turbine Retrofitting of Six Boiling Water Reactor Units Using Innovative Engineering and Laser Scanning Techniques

2009 ◽  
Author(s):  
Mike Jones ◽  
David J. Nelmes
Keyword(s):  
Steam Turbine ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Extensive Experience ◽  
Turbine Generators ◽  
The Usa ◽  
Water Reactors ◽  
Scan Data

Alstom Power is executing the steam turbine retrofit of six nuclear units for Exelon Generation in the USA. The existing turbine-generators are an 1800 RPM General Electric design originally rated at 912 MWe and 1098 MWe and powered by Boiling Water Reactors. 18 Low Pressure inner modules will be replaced, with the first due to be installed in March 2010. This project is particularly challenging — the aggressive retrofit installation schedule is compounded by the requirement to handle radioactively contaminated equipment and also comply with demanding regulations applicable to BWR plant. The author’s company has extensive experience in the steam turbine retrofit business, having supplied around 800 retrofit cylinders globally since the 1970’s. However, this LP upgrade challenges the established techniques used in the business and requires extraordinary effort. Traditional retrofit engineering and installation principles have been interrogated and developed to meet the specific requirements of this project. Innovative techniques are introduced, including the extensive use of the Leica HDS 6000 laser scanner to model the existing plant. The approach has advanced the field of steam turbine retrofit design and installation significantly. The first section of this paper focuses on the extraordinary considerations of the project and the challenges surrounding BWR plant. The second part describes the laser scanning technique and the application of scan data. It outlines the innovative solutions which have been developed.

scholarly journals Global existence of solutions for a multi-phase flow: A drop in a gas-tube

2016 ◽  
Vol 13 (02) ◽  
pp. 381-415
Author(s):  
Debora Amadori ◽  
Paolo Baiti ◽  
Andrea Corli ◽  
Edda Dal Santo
Keyword(s):  
Global Existence ◽  
Existence Of Solutions ◽  
Inviscid Fluid ◽  
Phase Flow ◽  
Lagrangian Coordinates ◽  
Large Initial Data ◽  
Initial Value ◽  
Global Existence Of Solutions ◽  
Multi Phase Flow ◽  
Multi Phase

In this paper we study the flow of an inviscid fluid composed by three different phases. The model is a simple hyperbolic system of three conservation laws, in Lagrangian coordinates, where the phase interfaces are stationary. Our main result concerns the global existence of weak entropic solutions to the initial-value problem for large initial data.

Effect of Fluid Type and Multi-Phase Flow on Sand Production in Oil and Gas Wells

2017 ◽  
Author(s):  
Haotian Wang ◽  
Deepen P. Gala ◽  
Mukul M. Sharma
Keyword(s):  
Oil And Gas ◽  
Phase Flow ◽  
Fluid Type ◽  
Sand Production ◽  
Gas Wells ◽  
Oil And Gas Wells ◽  
Multi Phase Flow ◽  
Multi Phase

JOINT NUMERICAL MICRO-SCALE SIMULATIONS OF MULTI-PHASE FLOW AND NMR RELAXATION BEHAVIOR IN POROUS MEDIA

2013 ◽  
Author(s):  
Oliver Mohnke ◽  
Norbert Klitzsch ◽  
Maik Stiebler
Keyword(s):  
Porous Media ◽  
Nmr Relaxation ◽  
Relaxation Behavior ◽  
Phase Flow ◽  
Micro Scale ◽  
Multi Phase Flow ◽  
Multi Phase

25.P.07 Eulerian approach for numerical simulation of multi-phase flow

1994 ◽  
Vol 25 ◽  
pp. 363-364
Author(s):  
C.H. Thill ◽  
D. Hänel
Keyword(s):  
Numerical Simulation ◽  
Phase Flow ◽  
Eulerian Approach ◽  
Multi Phase Flow ◽  
Multi Phase
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