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Title: SCDAP/RELAP5 Modeling of Movement of Melted Material Through Porous Debris in Lower Head

Abstract

Designs are described for implementing models for calculating the movement of melted material through the interstices in a matrix of porous debris in the lower head of a reactor vessel. The COUPLE model in SCDAP/RELAP5 represents both the porous and nonporous debris that results from core material slumping into the lower head during a severe accident in a Light Water Reactor. Currently, the COUPLE model has no capability to model the movement of material that melts within a matrix of porous material. The COUPLE model also does not have the capability to model the movement of liquefied core plate material that slumps onto a porous debris bed in the lower head. In order to advance beyond the assumption the liquefied material always remains stationary, designs are developed for calculations of the movement of liquefied material through the interstices in a matrix of porous material. Correlations are identified for calculating the permeability of the porous debris and for calculating the rate of flow of liquefied material through the interstices in the debris bed. Correlations are also identified for calculating the relocation of solid debris that has a large amount of cavities due to the flowing away of melted material. Equations aremore » defined for calculating the effect on the temperature distribution in the debris bed of heat transported by moving material and for changes in effective thermal conductivity and heat capacity due to the movement of material. The implementation of these models is expected to improve the calculation of the material distribution and temperature distribution of debris in the lower head for cases in which the debris is porous and liquefied material is present within the porous debris.« less

Authors:
Publication Date:
Research Org.:
Idaho National Engineering and Environmental Lab., Idaho Falls, ID (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
5864
Report Number(s):
INEEL/EXT-98-01178
TRN: US0101693
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Dec 1998
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; S CODES; R CODES; POROUS MATERIALS; REACTOR VESSELS; SPECIFIC HEAT; TEMPERATURE DISTRIBUTION; THERMAL CONDUCTIVITY; MASS TRANSFER; WATER COOLED REACTORS; C CODES; CORIUM; INTERSTICES; POROUS DEBRIS; LOWER HEAD; REACTOR VESSEL; COUPLE; SCDAP/RELAP5; NONPOROUS DEBRIS; CORE MATERIAL; SEVERE ACCIDENT; LIGHT WATER REACTOR; EFFECTIVE THERMAL CONDUCTIVITY; MELTED CORE MATERIAL

Citation Formats

L. J. Siefken. SCDAP/RELAP5 Modeling of Movement of Melted Material Through Porous Debris in Lower Head. United States: N. p., 1998. Web. doi:10.2172/5864.
L. J. Siefken. SCDAP/RELAP5 Modeling of Movement of Melted Material Through Porous Debris in Lower Head. United States. doi:10.2172/5864.
L. J. Siefken. Tue . "SCDAP/RELAP5 Modeling of Movement of Melted Material Through Porous Debris in Lower Head". United States. doi:10.2172/5864. https://www.osti.gov/servlets/purl/5864.
@article{osti_5864,
title = {SCDAP/RELAP5 Modeling of Movement of Melted Material Through Porous Debris in Lower Head},
author = {L. J. Siefken},
abstractNote = {Designs are described for implementing models for calculating the movement of melted material through the interstices in a matrix of porous debris in the lower head of a reactor vessel. The COUPLE model in SCDAP/RELAP5 represents both the porous and nonporous debris that results from core material slumping into the lower head during a severe accident in a Light Water Reactor. Currently, the COUPLE model has no capability to model the movement of material that melts within a matrix of porous material. The COUPLE model also does not have the capability to model the movement of liquefied core plate material that slumps onto a porous debris bed in the lower head. In order to advance beyond the assumption the liquefied material always remains stationary, designs are developed for calculations of the movement of liquefied material through the interstices in a matrix of porous material. Correlations are identified for calculating the permeability of the porous debris and for calculating the rate of flow of liquefied material through the interstices in the debris bed. Correlations are also identified for calculating the relocation of solid debris that has a large amount of cavities due to the flowing away of melted material. Equations are defined for calculating the effect on the temperature distribution in the debris bed of heat transported by moving material and for changes in effective thermal conductivity and heat capacity due to the movement of material. The implementation of these models is expected to improve the calculation of the material distribution and temperature distribution of debris in the lower head for cases in which the debris is porous and liquefied material is present within the porous debris.},
doi = {10.2172/5864},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {12}
}

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