Paper 5: Development of a Single-Stage Boiler Feed Pump for Nuclear Power Stations

1969 ◽  
Vol 184 (14) ◽  
pp. 48-59
Author(s):  
A. A. Gasiunas
Keyword(s):  
Future Development ◽  
Nuclear Power ◽  
Pressure Fluctuations ◽  
Test Results ◽  
Feed Pump ◽  
Pump Design ◽  
Vital Importance ◽  
Power Stations ◽  
Radial Forces ◽  
High Head

An unparalleled increase in the output of power-generating units in the last decade has made it necessary to reconsider the established boiler feed pump design philosophy. This paper deals with a number of design aspects which are of vital importance for the future development of a modern high head per stage boiler feed pump. The paper discusses the pressure and depression pulses that are generated when impeller vanes travel past the stationary vanes of guide equipment. It is considered that these pressure fluctuations can cause cavitational damage in the impeller and other parts, and also the uneven running of a pump. The influence of geometrical and hydraulic non-symmetry on radial forces in a double volute casing is dealt with. Test results of a double suction model boiler feed pump are presented, including descriptions of durability runs with paint-coated hydraulic surfaces.

Electroslag Strip Cladding of Steam Generators With Alloy 690

2006 ◽  
Author(s):  
M. Consonni ◽  
F. Maggioni ◽  
F. Brioschi
Keyword(s):  
Nuclear Power ◽  
Filler Metal ◽  
Hot Cracking ◽  
Test Results ◽  
Steam Generators ◽  
High Productivity ◽  
Cladding Layer ◽  
Power Stations ◽  
Alloy 690 ◽  
Submerged Arc

The present paper details the results of electroslag cladding and tube-to-tubesheet welding qualification tests conducted by Ansaldo-Camozzi ESC with Alloy 690 (Alloy 52 filler metal) on steel for nuclear power stations’ steam generators shell, tubesheet and head; the possibility of submerged arc cladding on first layer was also considered. Test results, in terms of chemical analysis, mechanical properties and microstructure are reproducible and confidently applicable to production cladding and show that electroslag process can be used for Alloy 52 cladding with exceptionally stable and regular operation and high productivity. The application of submerged arc cladding process to the first layer leads to a higher base metal dilution, which should be avoided. Moreover, though the heat affected zone is deeper with electroslag cladding, in both cases no coarsened grain zone is found due to recrystallisation effect of second cladding layer. Finally, the application of electroslag process to cladding of Alloy 52 with modified chemical composition, was proved to be highly beneficial as it strongly reduces hot cracking sensitivity, which is typical of submerged arc cladded Alloy 52, both during tube-to-tubesheet welding and first re-welding.

scholarly journals Electric Power Generation from Low Head Simple Turbine for Remote Area Power Supply

2015 ◽  
Vol 74 (5) ◽  
Author(s):  
Erinofiardi Erinofiardi ◽  
Muhammad Syaiful ◽  
Adhy Prayitno
Keyword(s):  
High Efficiency ◽  
Remote Area ◽  
Test Results ◽  
Environment Friendly ◽  
Large Power ◽  
Power Stations ◽  
Grid Connection ◽  
Low Head ◽  
High Head ◽  
The Relationship

Over recent years, there has been an explosive growth of interest in the development of micro-hydropower generationturbine based on low head. Initial investment in building huge dams and large power stations is needed for high head turbine, beside these large dams are not environment friendly. Particularly in lower head, screw turbine is suitable for environment reason where this turbine has high efficiency, relatively lower cost and low environmental impact. Screw turbine can be applied in remote area which has water resource and no grid connection available. This paper reports experimental results examining the relationship between rotation speed and power. Laboratory scale of screw turbine is made by using locally available materials. Test results show that different speed of generator caused by different diameter of pulleys has great discrepency. 

An evaluation of the equipment tagging process in nuclear power stations

1983 ◽  
Author(s):  
Peter Doyle ◽  
Lothar Schroeder ◽  
Stephen Brewer
Keyword(s):  
Nuclear Power ◽  
Power Stations

Environmental Protection Meets Security of Electricity Supply

2021 ◽  
pp. 1-18
Author(s):  
Ilina Cenevska
Keyword(s):  
Environmental Protection ◽  
Nuclear Power ◽  
Habitats Directive ◽  
Electricity Supply ◽  
The European Union ◽  
Power Stations ◽  
Court Of Justice ◽  
National Energy Policy ◽  
The Relationship ◽  
Practical Implications

Abstract This case comment explores the relationship between two intertwined objectives – ensuring security of electricity supply and environmental protection – in the context of the judgment of the Court of Justice of the European Union in Inter-Environnement Wallonie ASBL and Bond Beter Leefmilieu Vlaanderen ASBL v. Conseil des ministres. The analysis focuses on the application of the Environmental Impact Assessment Directive and the Habitats Directive to the facts of the case, which concerns the extension by a ten-year period of the operation of two Belgian nuclear power stations (Doel 1 and Doel 2) as part of a national energy policy strategy to ensure the security of Belgium's electricity supply. The case comment also considers the legal and practical implications that arise as a result of employing the ‘security of electricity supply’ exemption to enable derogation from the requirements of the aforementioned Directives in circumstances where a Member State considers the security of its electricity supply to be under threat.

Evaluation of the residual stress in stainless steel 304L hydraulically expanded joints

2020 ◽  
pp. 095440892096401
Author(s):  
Ying Hong ◽  
Xuesheng Wang ◽  
Yan Wang ◽  
Zhao Zhang ◽  
Yong Han
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Yield Strength ◽  
Residual Stresses ◽  
Heat Exchangers ◽  
Nuclear Power ◽  
The Finite Element Method ◽  
Power Stations ◽  
Stainless Steel 304 ◽  
Initial Clearance

Stainless steel 304 L tubes are commonly used in the fabrication of heat exchangers for nuclear power stations. The stress corrosion cracking (SCC) of 304 L tubes in hydraulically expanded tube-to-tubesheet joints is the main reason for the failure of heat exchangers. In this study, 304 L hydraulically expanded joint specimens were prepared and the residual stresses of a tube were evaluated with both an experimental method and the finite element method (FEM). The residual stresses in the outer and inner surfaces of the tube were measured by strain gauges. The expanding and unloading processes of the tube-to-tubesheet joints were simulated by the FEM. Furthermore, an SCC test was carried out to verify the results of the experimental measurement and the FEM. There was good agreement between the FEM and the experimental results. The distribution of the residual stress of the tube in the expanded joint was revealed by the FEM. The effects of the expansion pressure, initial tube-to-hole clearance, and yield strength of the tube on the residual stress in the transition zone that lay between the expanded and unexpanded region of the tube were investigated. The results showed that the residual stress of the expanded joint reached the maximum value when the initial clearance was eliminated. The residual stress level decreased with the decrease of the initial tube-to-hole clearance and yield strength. Finally, an effective method that would reduce the residual stress without losing tightness was proposed.

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