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Title: Effects of Surface Roughness, Oxidation, and Temperature on the Emissivity of Reactor Pressure Vessel Alloys

Abstract

Thermal radiation will be an important mode of heat transfer in future high-temperature reactors and in off-normal high-temperature scenarios in present reactors. In this work, spectral directional emissivities of two reactor pressure vessel (RPV) candidate materials were measured at room temperature after exposure to high-temperature air. In the case of SA508 steel, significant increases in emissivity were observed due to oxidation. In the case of Grade 91 steel, only very small increases were observed under the tested conditions. Effects of roughness were also investigated. To study the effects of roughening, unexposed samples of SA508 and Grade 91 steel were roughened via one of either grinding or shot-peening before being measured. Significant increases were observed only in samples having roughness exceeding the roughness expected of RPV surfaces. While the emissivity increases for SA508 from oxidation were indeed significant, the measured emissivity coefficients were below that of values commonly used in heat transfer models. Based on the observed experimental data, recommendations for emissivity inputs for heat transfer simulations are provided.

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [1]
  1. University of Wisconsin–Madison, Department of Engineering Physics, Madison, Wisconsin
  2. National Renewable Energy Laboratory, Concentrating Solar Power Group, Golden, Colorado
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Nuclear Energy University Program
OSTI Identifier:
1399085
Report Number(s):
NREL/JA-5500-70256
Journal ID: ISSN 0029-5450
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 200; Journal Issue: 1; Journal ID: ISSN 0029-5450
Publisher:
Taylor & Francis - formerly American Nuclear Society (ANS)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; spectral emissivity; low-alloy steels; reactor pressure vessel

Citation Formats

King, J. L., Jo, H., Tirawat, R., Blomstrand, K., and Sridharan, K. Effects of Surface Roughness, Oxidation, and Temperature on the Emissivity of Reactor Pressure Vessel Alloys. United States: N. p., 2017. Web. doi:10.1080/00295450.2017.1353869.
King, J. L., Jo, H., Tirawat, R., Blomstrand, K., & Sridharan, K. Effects of Surface Roughness, Oxidation, and Temperature on the Emissivity of Reactor Pressure Vessel Alloys. United States. doi:10.1080/00295450.2017.1353869.
King, J. L., Jo, H., Tirawat, R., Blomstrand, K., and Sridharan, K. Thu . "Effects of Surface Roughness, Oxidation, and Temperature on the Emissivity of Reactor Pressure Vessel Alloys". United States. doi:10.1080/00295450.2017.1353869.
@article{osti_1399085,
title = {Effects of Surface Roughness, Oxidation, and Temperature on the Emissivity of Reactor Pressure Vessel Alloys},
author = {King, J. L. and Jo, H. and Tirawat, R. and Blomstrand, K. and Sridharan, K.},
abstractNote = {Thermal radiation will be an important mode of heat transfer in future high-temperature reactors and in off-normal high-temperature scenarios in present reactors. In this work, spectral directional emissivities of two reactor pressure vessel (RPV) candidate materials were measured at room temperature after exposure to high-temperature air. In the case of SA508 steel, significant increases in emissivity were observed due to oxidation. In the case of Grade 91 steel, only very small increases were observed under the tested conditions. Effects of roughness were also investigated. To study the effects of roughening, unexposed samples of SA508 and Grade 91 steel were roughened via one of either grinding or shot-peening before being measured. Significant increases were observed only in samples having roughness exceeding the roughness expected of RPV surfaces. While the emissivity increases for SA508 from oxidation were indeed significant, the measured emissivity coefficients were below that of values commonly used in heat transfer models. Based on the observed experimental data, recommendations for emissivity inputs for heat transfer simulations are provided.},
doi = {10.1080/00295450.2017.1353869},
journal = {Nuclear Technology},
issn = {0029-5450},
number = 1,
volume = 200,
place = {United States},
year = {2017},
month = {8}
}