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REFEL silicon carbide. The development of a ceramic for a nuclear engineering application

Abstract

REFEL silicon carbide is a strong, uniform, fine-grain material which retains its strength and is stable in an oxidizing environment up to 1400 deg C. REFEL silicon carbide tube can be produced in quantity and by a combination of process controls, visual examination, NDT and proof testing, a very consistent product can be made. The material was developed as a nuclear fuel cladding capable of operating at temperatures o 1100 deg C in a CO2-cooled reactor and the combination of excellent physical, mechanical and chemical properties together with product consistency ave confirmed the feasibility of this application. In a series of irradiation experiments, REFEL silicon carbide clad fuel pins have behaved predictably. At irradiation temperatures below about 800 deg C, the thermal conductivity falls sharply, the associate thermal stress increases, and the probability of failure, for the same rating, increases. It has been demonstrated theoretically that this effect can be overcome by halving the tube wall thickness. In addition to the thermal stress enhancement, the strength and Weibull modulus also fall under irradiation and consequently the safe working stress is reduced, Calculations show that in the absence of irradiation a fourfold increase in rating cold be tolerated. Thus, the material  More>>
Publication Date:
Oct 15, 1974
Product Type:
Conference
Report Number:
TRG-Report-2627(S); CONF-741096-1
Reference Number:
NSA-32-009335
Resource Relation:
Conference: 3. materials conference on turbine applications, Ann Arbor, MI (United States), 28 Oct 1974
Subject:
N50120* -Metals, Ceramics, & Other Materials-Ceramics & Cermets-Preparation & Fabrication; FUEL PINS; CLADDING; GAS TURBINES; MATERIALS TESTING; SILICON CARBIDES; PHYSICAL RADIATION EFFECTS; CHEMICAL PROPERTIES; FABRICATION; MECHANICAL PROPERTIES; NUCLEAR ENERGY; OXIDATION; PERFORMANCE TESTING; PHYSICAL PROPERTIES; STABILITY; THERMAL CONDUCTIVITY; VERY HIGH TEMPERATURE
Sponsoring Organizations:
Sponsor not identified
OSTI ID:
4952054
Research Organizations:
UKAEA Reactor Group, Springfields (United Kingdom)
Country of Origin:
United Kingdom
Language:
English
Submitting Site:
GB
Size:
Pages: 18
Announcement Date:
Mar 16, 2013

Citation Formats

Kennedy, P., and Shennan, J. V. REFEL silicon carbide. The development of a ceramic for a nuclear engineering application. United Kingdom: N. p., 1974. Web.
Kennedy, P., & Shennan, J. V. REFEL silicon carbide. The development of a ceramic for a nuclear engineering application. United Kingdom.
Kennedy, P., and Shennan, J. V. 1974. "REFEL silicon carbide. The development of a ceramic for a nuclear engineering application." United Kingdom.
@misc{etde_4952054,
title = {REFEL silicon carbide. The development of a ceramic for a nuclear engineering application}
author = {Kennedy, P., and Shennan, J. V.}
abstractNote = {REFEL silicon carbide is a strong, uniform, fine-grain material which retains its strength and is stable in an oxidizing environment up to 1400 deg C. REFEL silicon carbide tube can be produced in quantity and by a combination of process controls, visual examination, NDT and proof testing, a very consistent product can be made. The material was developed as a nuclear fuel cladding capable of operating at temperatures o 1100 deg C in a CO2-cooled reactor and the combination of excellent physical, mechanical and chemical properties together with product consistency ave confirmed the feasibility of this application. In a series of irradiation experiments, REFEL silicon carbide clad fuel pins have behaved predictably. At irradiation temperatures below about 800 deg C, the thermal conductivity falls sharply, the associate thermal stress increases, and the probability of failure, for the same rating, increases. It has been demonstrated theoretically that this effect can be overcome by halving the tube wall thickness. In addition to the thermal stress enhancement, the strength and Weibull modulus also fall under irradiation and consequently the safe working stress is reduced, Calculations show that in the absence of irradiation a fourfold increase in rating cold be tolerated. Thus, the material should have excellent thermal stress resistance in non-nuclear applications such as gas turbine components. (auth)}
place = {United Kingdom}
year = {1974}
month = {Oct}
}