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Bounding Core Temperature Transients For Severe And Rapid Water Ingress Scenarios In Modular High Temperature Gas Cooled Reactors
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Book Synopsis Bounding Core Temperature Transients for Severe and Rapid Water Ingress Scenarios in Modular High Temperature Gas-cooled Reactors by :
Download or read book Bounding Core Temperature Transients for Severe and Rapid Water Ingress Scenarios in Modular High Temperature Gas-cooled Reactors written by and published by . This book was released on 1990 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bounding Core Temperature Transients for Severe and Rapid Water Ingress Scenarios in Modular High Temperature Gas-cooled Reactors by :
Download or read book Bounding Core Temperature Transients for Severe and Rapid Water Ingress Scenarios in Modular High Temperature Gas-cooled Reactors written by and published by . This book was released on 1990 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Proceedings of Nuclear Thermal Hydraulics by : American Nuclear Society. Thermal Hydraulics Division. Meeting
Download or read book Proceedings of Nuclear Thermal Hydraulics written by American Nuclear Society. Thermal Hydraulics Division. Meeting and published by . This book was released on 1990 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transactions of the American Nuclear Society by :
Download or read book Transactions of the American Nuclear Society written by and published by . This book was released on 1990 with total page 1348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modular High-temperature Gas-cooled Reactor Short-term Thermal Response to Flow and Reactivity Transients by :
Download or read book Modular High-temperature Gas-cooled Reactor Short-term Thermal Response to Flow and Reactivity Transients written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Magnitude and Reactivity Consequences of Moisture Ingress Into the Modular High-Temperature Gas-Cooled Reactor Core by :
Download or read book Magnitude and Reactivity Consequences of Moisture Ingress Into the Modular High-Temperature Gas-Cooled Reactor Core written by and published by . This book was released on 1992 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Hypothetical Air Ingress Scenarios in Advanced Modular High Temperature Gas Cooled Reactors by :
Download or read book Hypothetical Air Ingress Scenarios in Advanced Modular High Temperature Gas Cooled Reactors written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Considering an extremely hypothetical scenario of complete cross duct failure and unlimited air supply into the reactor vessel of a modular high temperature gas cooled ractor, it is found that the potential air inflow remains limited due to the high friction pressure drop through the active core. All incoming air will be oxidized to CO and some local external burning would be temporarily possible in such a scenario. The accident would have to continue with unlimited air supply for hundreds of hours before the core structural integrity would be jeopardized.
Book Synopsis Severe Accident Core Heatup Transients in Modular High Temperature Gas-cooled Reactors Without Operating Reactor Cavity Cooling Systems by :
Download or read book Severe Accident Core Heatup Transients in Modular High Temperature Gas-cooled Reactors Without Operating Reactor Cavity Cooling Systems written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The ultimate decay heat removal system for the current Modular High Temperature Gas-Cooled reactors is a completely passive natural convection air cooling loop. This paper considers an extremely remote accident scenario, where even this passive system fails, and heat rejection is only via a layer of thermal insulation to the reactor silo structure and the surrounding soil. The results show that even in this case the peak fuel temperatures remain well within safe limits. However, vessel and concrete temperatures can - under extreme circumstances and after several weeks - reach temperature levels at which structural failure becomes possible.
Book Synopsis Reactivity Effects of Water Ingress Into the Core of a Modular High-temperature Gas-cooled Reactor by : Robert Louis Sant
Download or read book Reactivity Effects of Water Ingress Into the Core of a Modular High-temperature Gas-cooled Reactor written by Robert Louis Sant and published by . This book was released on 1996 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Criticality Effects of Water Ingress in Modular High Temperature Gas Cooled Reactors by : Philip Andrew Hopkins
Download or read book Criticality Effects of Water Ingress in Modular High Temperature Gas Cooled Reactors written by Philip Andrew Hopkins and published by . This book was released on 1992 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Severe Accident Core Heatup Transients in Modular High Temperature Gas-cooled Reactors Without Operating Reactor Cavity Cooling Systems by :
Download or read book Severe Accident Core Heatup Transients in Modular High Temperature Gas-cooled Reactors Without Operating Reactor Cavity Cooling Systems written by and published by . This book was released on 1988 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis HTGR (High Temperature Gas-Cooled Reactor) Ingress Analysis Using MINET. by :
Download or read book HTGR (High Temperature Gas-Cooled Reactor) Ingress Analysis Using MINET. written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling of water/steam ingress into the primary (helium) cooling circuit of a High Temperature Gas-Cooled Reactor (HTGR) is described. This modeling was implemented in the MINET Code, which is a program for analyzing transients in intricate fluid flow and heat transfer networks. Results from the simulation of a water ingress event postulated for the Modular HTGR are discussed. 27 refs., 6 figs., 6 tabs.
Book Synopsis Hypothetical Air Ingress Scenarios in Advanced Modular High Temeprature Gas Cooled Reactors by :
Download or read book Hypothetical Air Ingress Scenarios in Advanced Modular High Temeprature Gas Cooled Reactors written by and published by . This book was released on 1988 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Safety Aspects of Forced Flow Cooldown Transients in Modular High Temperature Gas-Cooled Reactors by :
Download or read book Safety Aspects of Forced Flow Cooldown Transients in Modular High Temperature Gas-Cooled Reactors written by and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 n removed by the passive Reactor (SCS) are assumed to have failed. Decay heat is the 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 report used 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.
