Preliminary Design Analysis of a Hot Gas Duct for the NHDD Program at Korea

2008 ◽  
Vol 33-37 ◽  
pp. 1227-1232
Author(s):  
Kee Nam Song ◽  
Hyeong Yeon Lee ◽  
Yong Wan Kim ◽  
Soo Bum Lee
Keyword(s):  
Material Selection ◽  
Preliminary Evaluation ◽  
Preliminary Design ◽  
Strength Evaluation ◽  
Design Concepts ◽  
Hot Gas ◽  
Creep Fatigue ◽  
Intermediate Heat Exchanger ◽  
Design Activities ◽  
Reactor Pressure

Korea Atomic Energy Research Institute (KAERI) is in the process of carrying out a Nuclear Hydrogen Development and Demonstration (NHDD) Program by considering the indirect cycle gas cooled reactors that produce heat at temperatures in the order of 950°C. A coaxial doubletube hot gas duct (HGD) is a key component connecting the reactor pressure vessel and the intermediate heat exchanger (IHX) for the NHDD program. Recently, a preliminary design evaluation for the hot gas duct of the NHDD program was carried out. These preliminary design activities include a preliminary decision on the geometric dimensions, a preliminary strength evaluation, an appropriate material selection, and identifying the design code for the HGD. In this study, a preliminary strength evaluation for the HGD of the NHDD program has been undertaken based on the HTR-10 design concepts. Also, a preliminary evaluation of the creep-fatigue damage for a high temperature HGD structure has been carried out according to the draft code case for Alloy 617. Preliminary strength evaluation results for the HGD showed that the geometric dimensions of the proposed HGD would be acceptable for the design requirements.

Preliminary Design Analysis of Hot Gas Ducts for the Nuclear Hydrogen System

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Kee-nam Song ◽  
Yong-wan Kim
Keyword(s):  
Material Selection ◽  
Design Analysis ◽  
Preliminary Design ◽  
Strength Evaluation ◽  
Hot Gas ◽  
Hydrogen System ◽  
Intermediate Heat Exchanger ◽  
Design Activities ◽  
Design Requirements ◽  
Reactor Pressure

Korea Atomic Energy Research Institute is in the process of carrying out a nuclear hydrogen system by considering the indirect cycle gas cooled reactors that produce heat at temperatures in the order of 950°C. A coaxial double-tube hot gas duct (HGD) is a key component connecting the reactor pressure vessel and the intermediate heat exchanger for the nuclear hydrogen system. Recently, a preliminary design analysis for the primary and secondary hot gas ducts of the nuclear hydrogen system was carried out. These preliminary design activities include a preliminary decision on the geometric dimensions, a preliminary strength evaluation, and an appropriate material selection. In this study, a preliminary strength evaluation for the HGDs of the nuclear hydrogen system has been undertaken. Preliminary strength evaluation results for the HGDs showed that the geometric dimensions of the proposed HGDs would be acceptable for the design requirements.

Preliminary Design Analysis of a Hot Gas Ducts for the Nuclear Hydrogen System

2008 ◽  
Author(s):  
Kee-Nam Song ◽  
Yong-Wan Kim
Keyword(s):  
Material Selection ◽  
Design Analysis ◽  
Preliminary Design ◽  
Strength Evaluation ◽  
Hot Gas ◽  
Hydrogen System ◽  
Intermediate Heat Exchanger ◽  
Design Activities ◽  
Design Requirements ◽  
Reactor Pressure

Korea Atomic Energy Research Institute (KAERI) is in the process of carrying out a nuclear hydrogen system by considering the indirect cycle gas cooled reactors that produce heat at temperatures in the order of 950 °C. A coaxial double-tube hot gas duct (HGD) is a key component connecting the reactor pressure vessel and the intermediate heat exchanger (IHX) for the nuclear hydrogen system. Recently, a preliminary design analysis for the primary and secondary hot gas ducts of the nuclear hydrogen system was carried out. These preliminary design activities include a preliminary decision on the geometric dimensions, a preliminary strength evaluation and an appropriate material selection. In this study, a preliminary strength evaluation for the HGDs of the nuclear hydrogen system has been undertaken. Preliminary strength evaluation results for the HGDs showed that the geometric dimensions of the proposed HGDs would be acceptable for the design requirements.

An invariant-based performance-oriented procedure for preliminary design of composite structures

2018 ◽  
Vol 90 (3) ◽  
pp. 532-541 ◽  
Author(s):  
Francesco Danzi ◽  
Giacomo Frulla ◽  
Giulio Romeo
Keyword(s):  
Composite Structures ◽  
Material Selection ◽  
Geometrical Shape ◽  
Preliminary Design ◽  
Functional Requirements ◽  
Content Type ◽  
Scaling Procedure ◽  
Daunting Task ◽  
Design Activities ◽  
Effort Reduction

Purpose This paper aims to present a systematic performance-oriented procedure to predict structural responses of composite layered structures. The procedure has a direct application in the preliminary design of aerospace composite structures evaluating the right and most effective material. Design/methodology/approach The aforementioned procedure is based upon the definition of stiffness invariants. In the paper, the authors briefly recall the definition and the physical explanation of the invariants, i.e. the trace; then they present the scaling procedure for the selection of the best material for a fixed geometrical shape. Findings The authors report the basic principles of the scaling procedure and several examples pertaining typical responses sought in the preliminary design of aeronautic structures Research limitations/implications Typically, during early stages, engineers had to perform the daunting task of balancing among functional requirements and constraints and give the optimum solution in terms of structural concept and material selection. Moreover, preliminary design activities require evaluating different responses as a function of as less as possible parameters, ensuring medium to high fidelity. The importance of incorporating as much physics and understanding of the problem as early as possible in the preliminary design stages is therefore fundamental. A robust and systematic procedure is necessary. Practical implications The time/effort reduction in the preliminary design of composite structures can increase the overall quality of the configuration chosen. Social implications Reduction in design costs and time. Originality/value In spite of the well-known invariant properties of composites, the application and extension to the preliminary design of composite structures by means of a scaling rule is new and original.

Preliminary Design Analysis of Hot Gas Ducts for a Nuclear Hydrogen System of 200 MWt

2008 ◽  
Author(s):  
Kee-Nam Song ◽  
Yong-Wan Kim
Keyword(s):  
Chemical Process ◽  
High Energy ◽  
Design Analysis ◽  
Normal Operation ◽  
Primary Circuit ◽  
Preliminary Design ◽  
Constant Flow ◽  
Strength Evaluation ◽  
Hot Gas ◽  
Hydrogen System

Very High Temperature Gas Cooled Reactor (VHTR) has been selected as a high energy heat source for a nuclear hydrogen generation. The VHTR can produce hydrogen from heat and water by using a thermo-chemical process or from heat, water, and natural gas by steam reformer technology. Korea Atomic Energy Research Institute (KAERI) is in the process of carrying out a nuclear hydrogen system by considering the indirect cycle gas cooled reactors that produce heat at temperatures in the order of 950°. The nuclear hydrogen system is planning to produce hydrogen by using nuclear energy and a thermo-chemical process. Helium gas is the choice for the coolant of the nuclear hydrogen system since it is an inert gas, with no affinity to a chemical or nuclear activity; therefore a radioactivity transport in the primary circuit of the nuclear hydrogen system is minimal under a normal operation. Moreover, its gaseous nature avoids problems related to a phase change and water-metal reactions and therefore improves its safety. A coaxial double-tube hot gas duct (HGD) is a key component connecting the reactor pressure vessel and the intermediate heat exchanger (IHX) for the nuclear hydrogen system. In this study, a preliminary design analysis for the primary and secondary HGDs of the nuclear hydrogen system was carried out. These preliminary design activities include a preliminary decision on the geometric dimensions, a preliminary strength evaluation and an appropriate material selection. A preliminary decision on the geometric dimensions of the HGDs was undertaken based on three engineering concepts, such as a constant flow velocity model (CFV model), a constant flow rate model (CFR model), a constant hydraulic head model (CHH model), and also based on a heat balanced model (HB model). We compared the geometric dimensions and their preliminary strength evaluation results from the various models.

Analysis of FIV Characteristics on a Coaxial Double-Tube Type Hot Gas Duct for the VHTR

2009 ◽  
Author(s):  
Kee-nam Song ◽  
Yong-wan Kim ◽  
S.-C. Park
Keyword(s):  
Hydrogen Generation ◽  
High Energy ◽  
Flow Induced Vibration ◽  
Hot Gas ◽  
Intermediate Heat Exchanger ◽  
Tube Type ◽  
Tube Structure ◽  
Very High ◽  
Reactor Pressure ◽  
Selection Of

The Very High Temperature Gas Cooled Reactor (VHTR) has been selected as a high energy heat source of the order of 950°C for nuclear hydrogen generation, which can produce hydrogen from water or natural gas. A primary hot gas duct (HGD) as a coaxial double-tube type cross vessel is a key component connecting the reactor pressure vessel and the intermediate heat exchanger in a VHTR. In this study, a structural sizing methodology for the primary HGD of a VHTR is suggested in order to modulate a flow-induced vibration (FIV). And as an example, a structural sizing of a horizontal HGD with a coaxial double-tube structure was carried out using the suggested method. These activities include a decision of the geometric dimensions, a selection of the material, and a evaluation of the strength of the coaxial double-tube type cross vessel components. Also in order to compare the FIV characteristics of the proposed design cases, a fluid-structure interaction (FSI) analysis on a quarter part of the HGD was carried out using the ADINA code.

Experiences with alluvial foundations for earth dams in the Prairie provinces

1979 ◽  
Vol 16 (2) ◽  
pp. 255-271 ◽  
Author(s):  
N. Peters ◽  
K. N. Lamb
Keyword(s):  
Rational Design ◽  
Preliminary Design ◽  
Empirical Relationships ◽  
Design Concepts ◽  
Theoretical Design ◽  
Pore Pressures ◽  
Wide Range ◽  
Thick Layers ◽  
Limited Testing ◽  
Prairie Provinces

The foundations for numerous dams in proglacial and interglacial valleys in the Prairie provinces consist of soft alluvial soils. The deposits are up to 60 m deep, and contain thick layers of clay interspersed with lenses and layers of silt, sand, and gravel.This paper describes the damsite investigation and laboratory testing required, the design methods and construction procedures used, and the foundation performance observed during and after construction. A number of empirical relationships between index tests and physical properties of the soils, which provide useful guidelines for preliminary design, are presented.The design approach has gradually evolved from an empirical design with limited testing to a more rational design based on detailed investigations and thorough instrumentation. Increased reliance is placed on observational apparatus to monitor movements and pore pressures to confirm design assumptions as construction proceeds. The theoretical design is always checked with former designs of dams that have performed satisfactorily.Safe economical dams have been constructed in spite of large deformations and high pore pressures. Two case histories illustrate the wide range in dam design for alluvial foundations. The first shows an older design cross section with modifications required to ensure a stable dam, and the second describes a recently constructed dam that incorporates many of the latest design concepts.

scholarly journals The Design of an Advanced Cooled First Stage for a Full-Scale Utility Combustion Turbine

1982 ◽  
Author(s):  
G. N. Levari ◽  
J. D. Sauer ◽  
A. Cohn
Keyword(s):  
Heat Transfer ◽  
Material Selection ◽  
Field Tests ◽  
Full Scale ◽  
Fabrication Process ◽  
Preliminary Design ◽  
Design Work ◽  
Detailed Design ◽  
Temperature Selection ◽  
Acceptance Tests

The design of an advanced cooled first stage for a full-scale utility size combustion turbine is discussed. The preliminary design work involved evaluating three candidate “skin/spar” concepts: the shell/spar, Lamilloy*/spar and hybrid configurations. A shell/spar concept at 1600°F (871°C) maximum metal temperature was selected for continued development because it ensures against transpiration hole plugging; temperature selection was based on performance and corrosion considerations. The detailed design of the shell/spar advanced cooled stage is featured in this presentation and includes heat transfer and mechanical designs, stress analyses and durability considerations, and material selection. The fabrication process and acceptance tests planned for the advanced cooling components are described along with the shop and field tests proposed for the demonstration engine.

Case Study of Interstate 269 Corridor through Mississippi Focusing on Chemically Stabilized Pavement Layers

2019 ◽  
Vol 2673 (5) ◽  
pp. 374-388 ◽  
Author(s):  
W. Griffin Sullivan ◽  
Isaac L. Howard
Keyword(s):  
Construction Projects ◽  
Material Selection ◽  
Control Program ◽  
Mixture Design ◽  
Pavement Design ◽  
Specimen Preparation ◽  
Quality Control Program ◽  
Design Activities ◽  
Pavement Layers

The Mississippi corridor of Interstate 269 (I-269) is located in northwest Mississippi and construction of this corridor encompassed approximately 27 miles of new Interstate. This study documents I-269 as a case study of the chemically stabilized soil pavement layers. The evaluation comprises pre-construction activities (material selection, mixture design, pavement design, contract information), construction activities (processes, specifications, as-built quality), and an assessment of three cement stabilized base sections. Detailed assessment included on-site specimen preparation using the plastic mold compaction device (PM Device), core drilling, and subsequent laboratory testing for density, unconfined compressive strength, and elastic modulus. This project was able to document and quantify density variability within current Proctor and nuclear gauge practices to the point where there was noticeable agency and contractor risk. Variability is known to exist in large construction projects, but quantifiable measurements over a large project, as presented in this paper, are more valuable than general expectations for basing future decisions. This paper provides evidence that a construction quality control program where nuclear gauge and Proctor compaction practices are interconnected with mechanical property measurements taken on specimens fabricated with the PM Device is worth considering for implementation. The PM Device fared well for construction, mixture design, and pavement design activities when benchmarked relative to the density, strength, and modulus of the several dozen cores taken and assessed from I-269.

Study on Material Selection of Reactor Pressure Vessel of SCWR

2015 ◽  
pp. 493-499
Author(s):  
Ma Shuli ◽  
Luo Ying ◽  
Yin Qinwei ◽  
Li Changxiang ◽  
Xie Guofu
Keyword(s):  
Pressure Vessel ◽  
Material Selection ◽  
Reactor Pressure Vessel ◽  
Reactor Pressure ◽  
Selection Of

Statistical Methods for Creep, Fatigue and Fracture Data Analysis

1979 ◽  
Vol 101 (4) ◽  
pp. 344-348 ◽  
Author(s):  
G. J. Hahn
Keyword(s):  
Statistical Methods ◽  
Failure Time ◽  
High Stress ◽  
Problem Definition ◽  
Time Data ◽  
Design Concepts ◽  
Fracture Data ◽  
Fatigue And Fracture ◽  
Creep Fatigue

Statistical methods can play an important role in the proper collection and analysis of creep, fatigue and fracture data. This article deals with what statistics has to offer in this area. The following subjects are considered: The role of statistics in problem definition; the use of stress versus time as the dependent variable in the data fitting; treatment of variability between heats; analysis of data with run-outs; exclusion of extreme high stress-low failure time data from the analysis; experimental design concepts for obtaining the most useful data. The article is based upon a paper prepared at Bob Goldhoff’s suggestion and with his substantial assistance. This paper was originally presented to a 1977 NASA/EPRI/MPC Workshop.

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