In hypothetical reactor accidents, the thermohydraulic behaviour of core melts heated by the after-heat must be analyzed. For this purpose model experiments have been performed to study the stationary, natural convective heat transfer of internally heated...
National Technical Information Service (NTIS)
... For a given accident progression, the potential for direct flame ... This may require performing heat transfer analysis for exposed structural members ...
DTIC Science & Technology
The heat transfer characteristics of volume-heated boiling pools are of importance in the safety analysis of hypothetical core disruptive accidents in liquid metal fast breeder reactors. Investigations into the heat transfer and hydrodynamic behavior of s...
How much energy is removed from the core and where it is deposited are important considerations in severe accidents. The core heatup rate will affect the timing of the damage progression and the nature of the core debris. Heat transferred from the core to...
... NEUTRON FLUX, REACTOR REACTIVITY, REACTOR KINETICS, HEAT TRANSFER, REACTOR FUELS, ALGORITHMS, REACTOR ACCIDENTS ...
The estimation of heat-removal-capability from core debris that may be formed as a result of a hypothetical fuel disruptive accident in a LMFBR is of interest in the nuclear reactor safety analysis. After the accident, the fuel debris in the form of parti...
To carry out the accident analyses for the HANARO, RELAP5/MOD2 was modified. The heat transfer correlations and other thermal hydraulic models to account for the finned fuel elements and plate-type heat exchangers were modified to give RELAP5/KMRR, simula...
A heat removal system for nuclear reactors serving as a supplement to an Emergency Core Cooling System (ECCS) during a Loss of Coolant Accident (LOCA) comprises a plurality of heat pipes having one end in heat transfer relationship with either the reactor pressure vessel, the core support grid ...
DOE Information Bridge
A heat removal system for nuclear reactors serving as a supplement to an Emergency Core Cooling System (ECCS) during a Loss of Coolant Accident (LOCA) comprises a plurality of heat pipes having one end in heat transfer relationship with either the reactor...
Knowledge of falling film flow and heat transfer characteristics on horizontal tubes is required in the assessment of certain CANDU reactor accident sequences for those CANDU reactors which use moderator dump as one of the shut-down mechanisms. In these r...
10 CFR 71.73 Fire Accident; Cask Performance; Finite Element (ANSYS�) Model ... ANSYS� Model Mesh. Heat Transfer Mechanisms; Initial Conditions ...
NASA Website
A hypothetical core-disruptive accident in a liquid metal fast breeder reactor may result in the formation of an internally heated debris bed which is immersed in liquid sodium. A method is demonstrated for computing the heat transfer from such a bed to t...
It is often postulated that following a severe accident in either a liquid metal fast breeder reactor or a light water reactor a particulate debris bed will be formed. An understanding of the physical processes occurring in the debris bed often proves to be paramount in considering its coolability and hence the mitigation of the accident. It is probable ...
Energy Citations Database
A simplified model of heat transfer and chemical reaction has been adapted to evaluate the expected behavior of droplets containing unreacted Zircaloy and stainless steel moving through the containment atmosphere during postulated accidents involving direct containment heating. The model includes internal and ...
Limited information is available on the detailed heat transfer processes that occur in an undercooled core during a nuclear plant accident. This study determined the relative importance of conduction, convection, and radiation heat transfer in a PWR core with uncovered fuel rods. The resulting ...
This paper presents a degraded BWR core heat transfer model for the analysis of accidents leading to core meltdown. The model accounts for conduction, radiation and convection heat transfer, and evaluates such nodal quantities as the regional temperatures and/or melting rates of the fuel, clad, ...
Heat Exchanger Hot Molten Salt Cooling Water Helium Generator Recuperator Gas Compressor Hot Air Out. During operation, the molten salt coolant exit temperatures exceed 750EC. Heat is transferred to a multi transfer through the argon gas from the reactor vessel. Radiation heat ...
E-print Network
This report describes the heat transport under accident conditions from the reactor vessel wall of the INCOGEN installation to the environment. For this purpose, the heat transfer mechanisms as well as the flow patterns inside the cavity and the Reactor C...
This paper documents the heat-transfer analysis for the safety rod placed in a perforated guide tube during the gamma heating phase of a large-break loss of coolant accident in Savannah River K-reactor. The cooling mechanisms are natural convection to air...
In some scenarios of severe accidents of light water reactors, a layer of molten metal from internal structural components of the pressure vessel is predicted to occur on top of a ceramic core debris in the lower head. The layer transfers the heat generated in the ceramic pool to the side wall of the vessel, causing the latter to melt. ...
After the TMI (Three Mile Island) accident, there has been significant interest in analyzing and understanding the phenomena that may occur in a PWR (Pressurized Water Reactor) accident which may lead to partial or total core meltdown and degradation. Natural convection is one of the important phenomena. In the present paper the results of two numerical ...
In support of the crystalline silicotitanate (CST) ion exchange project of High-Level Waste (HLW) Process Engineering, a transient two-dimensional heat transfer model that includes the conduction process neglecting the convection cooling mechanism inside the CST column has been constructed and heat transfer ...
... HEAT TRANSFER), CONVECTION(HEAT TRANSFER), VAPORIZATION, CONDENSATION, HEAT OF VAPORIZATION, THERMAL RADIATION ...
Contents: The fundamentals of the theory of transfers; Heat conduction and heat transfer in bodies; Convection heat transfer; Radiative heat exchange.
This two-volume set presents the papers given at a conference concerning the fundamentals and applications of two-phase flow and heat transfer. Topics considered at the conference included equations, gas-liquid flow, hydrodynamics, pressure drop, steam separation, pressure wave propagation, flashing, boiling, condensation, reactor ...
... THESIS A HEAT TRANSFER MODEL FOR A HEATED HELIUM AIRSHIP by ... A HEAT TRANSFER MODEL OF A HEATED HELIUM AIRSHIP ...
Fundamental concepts and basic equations of a flowing thin liquid film cooling a heated surfaced by its vaporization and the effect of dry patches were treated. Stable film flow prior to the appearance of dry patches on the heated surface is maintained by a balance of various forces due to surface tension, shear stress, heat and mass ...
Radioactive afterheat is an important source term for the release of radionuclides in fusion systems under accident conditions. Heat transfer calculations are used to determine time-temperature histories in regions of interest, but the true source term needs to be the effective afterheat, which considers the transport of penetrating ...
To assure the protection of the public and plant equipment, improbable accidents were hypothesized to form the basis for the design of safety systems. One such accident is the postulated failure of the Intermediate Heat Transfer System (IHTS) piping within the Steam Generator Building (SGB), resulting in a ...
The general purpose of this project was the investigation of the heat transfer regimes during the high pressure portion of blowdown. The main attention has been focussed on the evaluation of those phenomena which are most important in reactor safety, such as maximum and minimum critical heat flux and forced convection film boiling ...
An analysis was performed to determine the peak heat structure temperature of internal reactor components during the gamma-heating phase of a large-break loss-of-coolant accident (LBLOCA) in a heavy-water reactor. During this phase, the reactor is scrammed, the coolant in the moderator tank is replaced by air, and fuel and control rod ...
