Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"HTGR"”.
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A reactor physics framework to detect anomalies in HTGR core
… in High Temperature Gas-cooled Reactors (HTGRs). Neutron noise is defined as the fluctuations in the neutron detector signal caused by perturbations in a nuclear reactor. Neutron noise analysis is performed by obtaining the neutron flux signals in the time domain, which is then converted …
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Impact of nuclear data libraries for criticality calculation of HTGR
… for High-Temperature Gas-cooled Reactors (HTGR). Accurate nuclear data is essential for reactor safety analysis. However, previous studies have reported significant differences in calculated keff for HTGR systems when different nuclear data libraries are employed. This discrepancy can be …
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Feasibility of breed/burn fuel cycles in pebble bed HTGR reactors.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Conceptual Structural Design of Core Components for a Horizontal, Compact HTGR
… oriented High Temperature Gas Reactor (HTGR) concept and its core components. HTGRs hold significant potential in decarbonizing industrial process heat markets. Collaborators at MIT recently introduced the Horizontal, Compact HTGR (HC-HTGR), which expects to see a 20% reduction in …
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Conceptual design of an HTGR system for a total energy application.
Thesis. 1975. Nucl.E.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Effects of fuel particle and reactor core design on modular HTGR source terms
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1987.
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Exploring the improvement of HTGR economics with heat storage for variable electricity output at base-load operations
… design is integrated into the primary loop of an HTGR reactor to minimize the use of inefficient heat exchangers. The proposed system is connected to the reactor outlet and inlet and operates a separate turbine loop once charged. The heat storage media is chosen to be ceramic brick made of alumina …
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Neutronic Analysis of Horizontal-Compact High Temperature Gas-cooled Reactor
… compact high temperature gas-cooled reactor (HC-HTGR) has been proposed. The HC-HTGR has potential to reduce the capital cost of a traditional vertical oriented HTGR by 20% through reduction in reactor building volume. This benefit comes with a trade-off in control system design that requires the …
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Analyzing FLUENT CFD models and data to develop fundamental codes to assess the effects of graphite oxidation in an HTGR air ingress accident
The primary product of this thesis is a faster running computer code to model air ingress events in high temperature gas reactors as a potential subroutine for nodal codes such as MELCOR to model air ingress events. Because of limitations found in FLUENT, and the limitations of the data set, a …
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High temperature creep behavior of Inconel 617 and Haynes 230
The high temperature gas-cooled reactor (HTGR) has been selected for the Next Generation Nuclear Plant (NGNP) project. The structural materials of HTGR will serve in the temperature range of 760-950oC and withstand coolant pressure up to 7 MPa for a design life of 60 years. Currently, Ni-based …
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Radiation Shielding Design and Radioactive Waste Assessment of Horizontal Compact High Temperature Gas-Cooled Reactor
… small High Temperature Gas-Cooled Reactors (HTGRs) can provide economic, environmentally favorable and reliable electricity and heat for community and industrial purposes, Boston Atomics LLC initiated the design of Horizontal Compact HTGR (HC-HTGR). This work addresses shielding, activation …
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Air Ingress in HTGRs: the process, effects, and experimental methods relating to its investigation and consequences
… stability at temperatures well above HTGR operating conditions. However, in the case of an air ingress accident, the oxygen introduced into the core can affect the integrity of the fuel graphite matrix. In this work a combination of computational models and mixed effects experiments …
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Design for Cost Methodology Applied to High Temperature Gas-Cooled Reactors
… nuclear reactor architecture called the Class A HTGR (CA-HTGR), where Class A refers to the passive safety class during decay heat cooling. The architecture is used in a coupled design and cost approach to search for Levelized Cost of Electricity (LCOE) minimizing designs. The feasibility and …
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Modelling of Graphite Elements and Low Enriched Fuel Assemblies for a High Temperature Gas-Cooled Reactor
… Compact High Temperature Gas-cooled Reactor (HC-HTGR), which Boston Atomics is seeking to commercialize. The HC-HTGR leverages the safety advantages of gas- cooled, TRISO fuelled reactors, and the economic advantages of a horizontal compact layout. Graphite assembly blocks create the channels …
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Surface degradation and creep of Inconel 617 and Haynes 230 at high temperatures
The high temperature gas-cooled reactor (HTGR) design has been selected for the Next Generation Nuclear Plant (NGNP) project. The helium coolant in the primary circuit has been found to contain low levels of impurities (e.g. CO, CO2, H2O, CH4, and H2) after steady-state operation. This can lead to …
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An integrated performance model for high temperature gas cooled reactor coated particle fuel
… and deployment of High Temperature Gas Reactor (HTGR) systems for future power generation. Fuel performance modeling is indispensable for understanding the physical behavior of fuel particles and achieving their high reliability during operations and accidents through a guided design process. …
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The flow structure under mixed convection in a uniformly heated vertical pipe
… the high temperature gas-cooled thermal reactor (HTGR), the decay heat removal (DHR) in depressurization accidents is a major challenge to be overcome. This is due to (1) a gas has inherently inferior heat transport capabilities compared to a liquid and (2) the high surface heat flux of the GFR …
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Investigation of MELCOR and STAR-CCM+ modeling capabilities to accurately predict air ingress rates from small breaks in high temperature gas-cooled reactors
In a High Temperature Gas-cooled Reactor (HTGR), the study of postulated accident scenarios is necessary for licensing, deployment, and public perception. One specific scenario of concern is the air ingress following a primary loop break. Recent research has determined that small breaks are more …
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Isotopic and reactor physics characterization of a gas-cooled, pebble-bed microreactor
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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CFD Analyses of Flow Structures in Air-Ingress and Rod Bundle Problems
Two topics from nuclear engineering field are included in this dissertation. One study is the air-ingress phenomenon during a loss of coolant accident (LOCA) scenario, and the other is a 5-by-5 bundle assembly problem under a design of PWRs. The objectives are to investigate the Kelvin-Helmholtz …
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