Modular High Temperature Gas Cooled Reactor Short Term Thermal Response To Flow And Reactivity Transients
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Modular High Temperature Gas Cooled Reactor Short Term Thermal Response To Flow And Reactivity Transients
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Author :
language : en
Publisher:
Release Date : 1993
Modular High Temperature Gas Cooled Reactor Short Term Thermal Response To Flow And Reactivity Transients written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
The research reported here has been conducted at the Oak Ridge National Laboratory for the Nuclear Regulatory Commission's Division of Regulatory Applications of the Office of Nuclear Regulatory Research. The short-term thermal response of the Modular High-Temperature Gas-Cooled Reactor (MHTGR) is analyzed for a range of flow and reactivity transients. These transients include loss of forced circulation without scram, spurious withdrawal of a control rod group, moisture ingress, control rod and control rod group ejections, and a rapid core cooling event. For each event analyzed, an event description, a discussion of the analysis approach and assumptions, and results are presented. When possible, results of these analyses are compared with those presented by the designers in the MHTGR Preliminary Safety Information Document and in the MHTGR Probabilistic Risk Assessment. The importance of inherent safety features is illustrated, and conclusions are presented regarding the safety performance of the MHTGR. Recommendations are made for a more in-depth examination of MHTGR response for some of the analyzed transients. The coupled heat transfer-neutron kinetics model is described in detail in Appendix A.
Safety Aspects Of Forced Flow Cooldown Transients In Modular High Temperature Gas Cooled Reactors
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Author :
language : en
Publisher:
Release Date : 1992
Safety Aspects Of Forced Flow Cooldown Transients In Modular High Temperature Gas Cooled Reactors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
During some of the design basis accidents in Modular High Temperature Gas Cooled Reactors (MHTGRs) the main Heat Transport System (HTS) and the Shutdown Cooling System (SCS), are assumed to have failed. Decay heat is then removed by the passive Reactor Cavity Cooling System (RCCS) only. If either forced flow cooling system becomes available during such a transient, its restart could significantly reduce the down-time. This paper uses the THATCH code to examine whether such restart, during a period of elevated core temperatures, can be accomplished within safe limits for fuel and metal component temperatures. If the reactor is scrammed, either system can apparently be restarted at any time, without exceeding any safe limits. However, under unscrammed conditions a restart of forced cooling can lead to recriticality, with fuel and metal temperatures significantly exceeding the safety limits.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1994-11
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 1994-11 with Power resources categories.
Magnitude And Reactivity Consequences Of Moisture Ingress Into The Modular High Temperature Gas Cooled Reactor Core
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Author :
language : en
Publisher:
Release Date : 1992
Magnitude And Reactivity Consequences Of Moisture Ingress Into The Modular High Temperature Gas Cooled Reactor Core written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Inadvertent admission of moisture into the primary system of a modular high-temperature gas-cooled reactor has been identified in US Department of Energy-sponsored studies as an important safety concern. The work described here develops an analytical methodology to quantify the pressure and reactivity consequences of steam-generator tube rupture and other moisture-ingress-related incidents. Important neutronic and thermohydraulic processes are coupled with reactivity feedback and safety and control system responses. The rate and magnitude of steam buildup are found to be dominated by major system features such as break size compared with safety valve capacity and reliability and less sensitive to factors such as heat transfer coefficients. The results indicate that ingress transients progress at a slower pace than previously predicted by bounding analyses, with milder power overshoots and more time for operator or automatic corrective actions.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1988
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 1988 with Power resources categories.
Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Advances In High Temperature Gas Cooled Reactor Fuel Technology
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Author : International Atomic Energy Agency
language : en
Publisher:
Release Date : 2012-06
Advances In High Temperature Gas Cooled Reactor Fuel Technology written by International Atomic Energy Agency and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-06 with Business & Economics categories.
This publication reports on the results of a coordinated research project on advances in high temperature gas cooled reactor (HTGR) fuel technology and describes the findings of research activities on coated particle developments. These comprise two specific benchmark exercises with the application of HTGR fuel performance and fission product release codes, which helped compare the quality and validity of the computer models against experimental data. The project participants also examined techniques for fuel characterization and advanced quality assessment/quality control. The key exercise included a round-robin experimental study on the measurements of fuel kernel and particle coating properties of recent Korean, South African and US coated particle productions applying the respective qualification measures of each participating Member State. The summary report documents the results and conclusions achieved by the project and underlines the added value to contemporary knowledge on HTGR fuel.
Bounding Core Temperature Transients For Severe And Rapid Water Ingress Scenarios In Modular High Temperature Gas Cooled Reactors
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Author :
language : en
Publisher:
Release Date : 1990
Bounding Core Temperature Transients For Severe And Rapid Water Ingress Scenarios In Modular High Temperature Gas Cooled Reactors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
A rapid water ingress transient, resulting from steam generator tube or tube-sheet failures, could lead to a reactivity insertion and core heatup in the Modular High Temperature Gas-Cooled Reactors. This paper considers the effect of hypothetical rapid and severe water ingress scenarios of extremely low probability, and assesses the effect of such transients on potentially excessive fuel temperatures and subsequent fuel failures. The results indicate that for the worst postulated scenarios the conservatively set limiting fuel temperature of 1600°C is indeed exceeded, but only for a few seconds, and then only in a small fraction of the core. Therefore, it appears that even the most severe and rapid water ingress transients would not lead to significant fuel failures. Parametric variations of the key variables indicate that the reactivity worth of water and the fuel thermal properties must be established with high confidence as the design progresses. 7 refs., 11 figs., 3 tabs.
Minet Momentum Integral Network Analysis Of Mhtgr Modular High Temperature Gas Cooled Reactor Moisture Ingress Transient
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Author :
language : en
Publisher:
Release Date : 1987
Minet Momentum Integral Network Analysis Of Mhtgr Modular High Temperature Gas Cooled Reactor Moisture Ingress Transient written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
The transient which involved a steam-generator tube leak and the ingress of moisture into the primary coolant system of the standard Modular Modular High Temperature Gas-Cooled Reactor (MHTGR) is analyzed by using the MINET (Momentum Integral NETwork) computer code. The analysis provides detailed information on the effect of power excursion on transient system pressures and temperatures. It is concluded that during the short term transient period the moisture ingress presents no threat to the integrity of the fuel elements and does not lead to pressures which would cause relief valve opening and fission product release.
Gas Cooled Reactor Coolant Choice
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Author : Oak Ridge National Laboratory
language : en
Publisher:
Release Date : 1959
Gas Cooled Reactor Coolant Choice written by Oak Ridge National Laboratory and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Gas cooled reactors categories.
High Temperature Gas Cooled Reactor For Process Heat Applications
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Author : Kurt Kugeler
language : en
Publisher: Springer
Release Date : 2024-10-10
High Temperature Gas Cooled Reactor For Process Heat Applications written by Kurt Kugeler and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-10-10 with Science categories.
This book highlights the process of heat applications driven by modular high-temperature gas-cooled reactors (HTGRs) which have inherent safety characteristics and high outlet temperature. The book systematically covers related principles, guidelines and discussion about circuits, components and the coupling with HTGR, recommendations of safety measures, and economic and environmental requirements, with examples and experience from long-term practice. The combination of the HTGR technology and process heat applications not only is important for promoting the use of HTGR but also provides an option of significant potential for the replacement of conventional fossil fuels. With over a thousand illustrations, the book is of outstanding reference value for researchers and professionals to develop a thorough understanding.