Evaluation Of Condensation Induced Water Hammer In Preheat Steam Generators
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An Evaluation Of Condensation Induced Water Hammer In Preheat Steam Generators
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Author : Pradip Saha
language : en
Publisher:
Release Date : 1980
An Evaluation Of Condensation Induced Water Hammer In Preheat Steam Generators written by Pradip Saha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Nuclear pressure vessels categories.
Evaluation Of Condensation Induced Water Hammer In Preheat Steam Generators
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Author :
language : en
Publisher:
Release Date : 1980
Evaluation Of Condensation Induced Water Hammer In Preheat Steam Generators written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
A review of Westinghouse 1/8-scale water hammer tests and data analysis was carried out. BNL has concluded that water hammers occurred in the feedwater line during many of the 1/8-scale tests. These events were probably caused by steam bubble entrapment and collapse in the partially-filled feedwater line. Recorded vessel pressure pulse activity under two-phase operating conditions was rare and, in those cases where pulses were recorded, the pressure pulse amplitudes were small. Either void collapse water hammers are unlikely events under these two-phase conditions, or events that did occur were attenuated in magnitude by the two-phase medium and internal structures before the pulse reached the pressure transducer. Pressure pulse attenuation in two-phase air-water media was studied experimentally at BNL. It was found that no significant attenuation could be detected in two-phase flows over distances of approximately 1 to 2 ft. The effects of internals, however, were not considered. The Westinghouse scaling laws have also been critically reviewed. An independent BNL analysis was carried out to verify the Westinghouse scaling laws. It has been found that the present state-of-the-art on the condensation heat transfer and the mechanism of vapor cavity formation precludes us from deriving any credible scaling criteria. However, it was found that under certain operating conditions the condensation-induced void collapse could be an oscillatory process. This may partially explain the apparent randomness of the water hammer phenomenon seen in most experimental studies.
Evaluation Of Water Hammer Potential In Preheat Steam Generators
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Author : D. E. Sexton
language : en
Publisher:
Release Date : 1982
Evaluation Of Water Hammer Potential In Preheat Steam Generators written by D. E. Sexton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Hydroelectric power plants categories.
Nureg Cr
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Author : U.S. Nuclear Regulatory Commission
language : en
Publisher:
Release Date : 1980
Nureg Cr written by U.S. Nuclear Regulatory Commission and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Nuclear energy categories.
Condensation Induced Water Hammer In Steam Generators
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Author :
language : en
Publisher:
Release Date : 1979
Condensation Induced Water Hammer In Steam Generators written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The case of condensation induced water hammer in nuclear steam generators is summarized, including both feed ring-type and economizer-type geometries. A slug impact model is described and used to demonstrate the parametric dependence of the impact pressures on heat transfer rates, initial pressures, and relative initial slug and void lengths. The results of the parametric study are related also to the economizer geometry and a suggested alternative model is presented. The importance of concerns regarding attenuation of shocks in two-phase media is delineated, and a simple experiment is described which was used to determine negligible attenuation within the accuracy of the experiment for void fractions up to over 30% in bubbly and slug flows.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1982
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Power resources categories.
Nuclear Safety
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Author :
language : en
Publisher:
Release Date : 1983
Nuclear Safety written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Nuclear engineering categories.
Numerical Analysis Of Condensation Induced Water Hammer In Horizontal Piping Systems
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Author : Thomas William Eichenberg
language : en
Publisher:
Release Date : 1990
Numerical Analysis Of Condensation Induced Water Hammer In Horizontal Piping Systems written by Thomas William Eichenberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Water hammer categories.
Condensation Induced Water-Hammer, CIWH, has been an historical problem for the nuclear power industry over the past 2 decades. It has caused damage to plant systems, and considerable anguish to plant operators. This thesis has embarked on an attempt to characterize the fluid motion, heat transfer, mixing, and stability of a horizontal, stratified flow of steam over subcooled water. A literature review was conducted to determine the state of numerical and analytical methods which have been applied to this problem. The result of the review has led to the implementation of new analytical interfacial stability models. Information from the review has also led to the development of correlations for wave frequency and amplitude on the phase interface. A numerical model has been developed to estimate the temperature profile on the phase interface. Also, the model will construct, by use of the above correlations, an estimate of the interface wave structure. This wave structure is then evaluated against a non-linear model for interface stability to determine the onset of slug formation. The numerical model has been used to evaluate two known CIWH events. The results indicate that the onset of slug formation is necessary, but not sufficient, to ensure a water-hammer event. The results imply that there is the possibility that once a slug has formed, it may break up before a trapped steam void can fully collapse. The model also indicates that CIWH in steam generator, feedwater nozzle sections is not due to the formation of slug on an unstable phase interface. Rather, CIWH may occur when the liquid level inside of the feedwater nozzle is above the top of the feedring, thus creating an isolated steam pocket. The rapid condensation of the trapped steam in the causes CIWH. This particular result implies that it may be possible to completely avoid CIWH in the feedwater nozzle altogether.
Monthly Catalog Of United States Government Publications
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Author : United States. Superintendent of Documents
language : en
Publisher:
Release Date : 1982
Monthly Catalog Of United States Government Publications written by United States. Superintendent of Documents and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Government publications categories.
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Monthly Catalogue United States Public Documents
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Author :
language : en
Publisher:
Release Date : 1982
Monthly Catalogue United States Public Documents written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Government publications categories.