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Title: Oxidation and Volatilization from Tungsten Brush High Heat Flux Armor During High Temperature Steam Exposure

Abstract

Tungsten brush accommodates thermal stresses and high heat flux in fusion reactor components such as plasma facing surfaces or armor. However, inherently higher surface areas are introduced with the brush design. We have tested a specific design of tungsten brush in steam between 500 and 1,100 C. Hydrogen generation and tungsten volatilization rates were determined to address fusion safety issues. The brush prepared from 3.2-mm diameter welding rods had a packing density of 85 percent. We found that both hydrogen generation and tungsten volatilization from brush, fixtured to represent a unit within a larger component, were less than projections based upon the total integrated surface area (TSA). Steam access and the escape of hydrogen and volatile oxide from void spaces within the brush are restricted compared to specimens with more direct diffusion pathways to the test environment. Hydrogen generation rates from restrained specimens based on normal surface area (NSA) remain about five times higher than rates based on total surface areas from specimens with direct steam access. Volatilization rates from restrained specimens based upon normal surface area (NSA) were only 50 percent higher than our historic cumulative maximum flux plot (CMFP) for tungsten. This study has shown that hydrogen generationmore » and tungsten volatilization from brush do not scale according to predictions with previously determined rates, but in fact, with higher packing density could approach those from flat surfaces.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
774310
Report Number(s):
INEEL/EXT-2000-00390
TRN: US0100948
DOE Contract Number:  
AC07-99ID13727
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HEAT FLUX; OXIDATION; STEAM; SURFACE AREA; THERMAL STRESSES; THERMONUCLEAR REACTORS; TUNGSTEN; WELDING RODS; EVAPORATION; TUNGSTEN BRUSH; HIGH HEAT FLUX; FUSION REACTOR; PLASMA FACING SURFACES; ARMOR; HYDROGEN GENERATION; TUNGSTEN VOLATILIZATION; SAFETY ISSUES; STEAM ACCESS; DIFFUSION PATHWAYS; PACKING DENSITY

Citation Formats

Smolik, G.R., Pawelko, R.J., Anderl, R.A., and Petti, D.A. Oxidation and Volatilization from Tungsten Brush High Heat Flux Armor During High Temperature Steam Exposure. United States: N. p., 2000. Web. doi:10.2172/774310.
Smolik, G.R., Pawelko, R.J., Anderl, R.A., & Petti, D.A. Oxidation and Volatilization from Tungsten Brush High Heat Flux Armor During High Temperature Steam Exposure. United States. doi:10.2172/774310.
Smolik, G.R., Pawelko, R.J., Anderl, R.A., and Petti, D.A. Mon . "Oxidation and Volatilization from Tungsten Brush High Heat Flux Armor During High Temperature Steam Exposure". United States. doi:10.2172/774310. https://www.osti.gov/servlets/purl/774310.
@article{osti_774310,
title = {Oxidation and Volatilization from Tungsten Brush High Heat Flux Armor During High Temperature Steam Exposure},
author = {Smolik, G.R. and Pawelko, R.J. and Anderl, R.A. and Petti, D.A.},
abstractNote = {Tungsten brush accommodates thermal stresses and high heat flux in fusion reactor components such as plasma facing surfaces or armor. However, inherently higher surface areas are introduced with the brush design. We have tested a specific design of tungsten brush in steam between 500 and 1,100 C. Hydrogen generation and tungsten volatilization rates were determined to address fusion safety issues. The brush prepared from 3.2-mm diameter welding rods had a packing density of 85 percent. We found that both hydrogen generation and tungsten volatilization from brush, fixtured to represent a unit within a larger component, were less than projections based upon the total integrated surface area (TSA). Steam access and the escape of hydrogen and volatile oxide from void spaces within the brush are restricted compared to specimens with more direct diffusion pathways to the test environment. Hydrogen generation rates from restrained specimens based on normal surface area (NSA) remain about five times higher than rates based on total surface areas from specimens with direct steam access. Volatilization rates from restrained specimens based upon normal surface area (NSA) were only 50 percent higher than our historic cumulative maximum flux plot (CMFP) for tungsten. This study has shown that hydrogen generation and tungsten volatilization from brush do not scale according to predictions with previously determined rates, but in fact, with higher packing density could approach those from flat surfaces.},
doi = {10.2172/774310},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

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