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Title: Melt seepage and plugging in an ex-vessel core-retention device composed of magnesia bricks

Abstract

A magnesia brick crucible, used as an ex-vessel core retention device, has been proposed for floating nuclear plants. The refractory brick concept has also been suggested for LMFBR plants, including Clinch River. The purpose of an ex-vessel core retention device is to prevent core-concrete interactions following a core melt accident. One disadvantage of the brick crucible concept is the design requirement for some spacing between bricks to allow for thermal expansion. Cracks resulting from thermal stress or mechanical damage will also be present. Both types of channels introduce a major failure mode. Penetration of the channels by melt could initiate catastrophic and rapid failure of the crucible by eroding the interlocking network and freeing bricks to float away. PLUGM, a coupled, thermal-hydraulic, computer model, answers questions concerning melt seepage and plugging in a cold channel. This paper also describes a series of experiments in which high-temperature steel and oxide melts are poured onto Harklase magnesia bricks. The experiments are designed to validate PLUGM predictions using prototypic materials.

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
6320676
Report Number(s):
SAND-82-2891C; CONF-830702-2
ON: DE83004955
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: 21. ASME/AIChE national heat transfer conference, Seattle, WA, USA, 24 Jul 1983; Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; CORE CATCHERS; MELTDOWN; FAILURES; THERMAL STRESSES; LMFBR TYPE REACTORS; HEAT TRANSFER; HYDRAULICS; OFFSHORE NUCLEAR POWER PLANTS; PWR TYPE REACTORS; COMPUTER CALCULATIONS; CORIUM; CRACKS; MAGNESIUM OXIDES; REACTOR SAFETY; ACCIDENTS; ALKALINE EARTH METAL COMPOUNDS; BREEDER REACTORS; CHALCOGENIDES; ENERGY TRANSFER; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FLUID MECHANICS; LIQUID METAL COOLED REACTORS; MAGNESIUM COMPOUNDS; MECHANICS; NUCLEAR FACILITIES; NUCLEAR POWER PLANTS; OXIDES; OXYGEN COMPOUNDS; POWER PLANTS; REACTOR ACCIDENTS; REACTOR COMPONENTS; REACTORS; SAFETY; STRESSES; THERMAL POWER PLANTS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220900* - Nuclear Reactor Technology- Reactor Safety; 210100 - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled; 210500 - Power Reactors, Breeding

Citation Formats

Pilch, M, and Fish, J. Melt seepage and plugging in an ex-vessel core-retention device composed of magnesia bricks. United States: N. p., 1983. Web.
Pilch, M, & Fish, J. Melt seepage and plugging in an ex-vessel core-retention device composed of magnesia bricks. United States.
Pilch, M, and Fish, J. 1983. "Melt seepage and plugging in an ex-vessel core-retention device composed of magnesia bricks". United States.
@article{osti_6320676,
title = {Melt seepage and plugging in an ex-vessel core-retention device composed of magnesia bricks},
author = {Pilch, M and Fish, J},
abstractNote = {A magnesia brick crucible, used as an ex-vessel core retention device, has been proposed for floating nuclear plants. The refractory brick concept has also been suggested for LMFBR plants, including Clinch River. The purpose of an ex-vessel core retention device is to prevent core-concrete interactions following a core melt accident. One disadvantage of the brick crucible concept is the design requirement for some spacing between bricks to allow for thermal expansion. Cracks resulting from thermal stress or mechanical damage will also be present. Both types of channels introduce a major failure mode. Penetration of the channels by melt could initiate catastrophic and rapid failure of the crucible by eroding the interlocking network and freeing bricks to float away. PLUGM, a coupled, thermal-hydraulic, computer model, answers questions concerning melt seepage and plugging in a cold channel. This paper also describes a series of experiments in which high-temperature steel and oxide melts are poured onto Harklase magnesia bricks. The experiments are designed to validate PLUGM predictions using prototypic materials.},
doi = {},
url = {https://www.osti.gov/biblio/6320676}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

Conference:
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