Resolving mode mixing in boiling water reactors instability analysis using variational mode decomposition

2020 ◽  
Author(s):  
Cristina Montalvo ◽  
Carlos J. Gavilán ◽  
Agustin García‐Berrocal ◽  
Luis A. Torres
Keyword(s):  
Boiling Water ◽  
Boiling Water Reactors ◽  
Variational Mode Decomposition ◽  
Instability Analysis ◽  
Mode Decomposition ◽  
Water Reactors ◽  
Mode Mixing

Stability monitor for Boiling Water Reactors based on the Multivariate Empirical Mode Decomposition

2015 ◽  
Vol 85 ◽  
pp. 453-460 ◽  
Author(s):  
Alfonso Prieto-Guerrero ◽  
Gilberto Espinosa-Paredes ◽  
Gerardo Abel Laguna-Sánchez
Keyword(s):  
Empirical Mode Decomposition ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Multivariate Empirical Mode Decomposition ◽  
Mode Decomposition ◽  
Water Reactors

scholarly journals Non-Linear Stability Analysis of Real Signals from Nuclear Power Plants (Boiling Water Reactors) based on Noise Assisted Empirical Mode Decomposition Variants and the Shannon Entropy

2017 ◽  
Author(s):  
Omar A. Olvera-Guerrero ◽  
Alfonso Prieto-Guerrero ◽  
Gilberto Espinosa-Paredes
Keyword(s):  
Empirical Mode Decomposition ◽  
Shannon Entropy ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Mode Decomposition ◽  
Non Linear ◽  
Water Reactors

There are currently around 78 Nuclear Power Plants (NPP) in the world based on Boiling Water Reactors (BWR). The current parameter to assess BWR instability issues is the linear Decay Ratio (DR). However, it is well known that BWRs are complex non-linear dynamical systems that may even exhibit chaotic dynamics that normally preclude the use of the DR when the BWR is working at a specific operating point during instability. In this work a novel methodology based on an adaptive Shannon Entropy estimator and on Noise Assisted Empirical Mode Decomposition variants is presented. This methodology was developed for real-time implementation of a stability monitor. This methodology was applied to a set of signals stemming from several NPPs reactors (Ringhals-Sweden, Forsmark-Sweden and Laguna Verde-Mexico) under commercial operating conditions, that experienced instabilities events, each one of a different nature

Wavelet-Based Method for Instability Analysis in Boiling Water Reactors

2005 ◽  
Vol 151 (3) ◽  
pp. 250-260 ◽  
Author(s):  
Gilberto Espinosa-Paredes ◽  
Alfonso Prieto-Guerrero ◽  
Alejandro Núñez-Carrera ◽  
Rodolfo Amador-García
Keyword(s):  
Boiling Water ◽  
Boiling Water Reactors ◽  
Instability Analysis ◽  
Water Reactors

Flashing-Induced Instability Analysis and the Start-Up of Natural Circulation Boiling Water Reactors

2011 ◽  
Vol 176 (1) ◽  
pp. 57-71 ◽  
Author(s):  
Rui Hu ◽  
Mujid S. Kazimi
Keyword(s):  
Natural Circulation ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Instability Analysis ◽  
Start Up ◽  
Water Reactors

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.

A Method for Calculating Power Distributions in Boiling Water Reactors Using In-Core Detector Readings

1981 ◽  
Vol 77 (2) ◽  
pp. 137-145 ◽  
Author(s):  
Sadao Uchikawa ◽  
Hiroshi Motoda
Keyword(s):  
Boiling Water ◽  
Boiling Water Reactors ◽  
Water Reactors

Stability of Natural-Circulation-Cooled Boiling Water Reactors during Startup: Experimental Results

2003 ◽  
Vol 143 (1) ◽  
pp. 77-88 ◽  
Author(s):  
Annalisa Manera ◽  
Tim H. J. J. van der Hagen
Keyword(s):  
Natural Circulation ◽  
Experimental Results ◽  
Boiling Water ◽  
Boiling Water Reactors ◽  
Water Reactors
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