Short term creep rupture predictions for tantalum alloy T-111
- Division 1832 Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-5800 (US)
A knowledge of the short term creep rupture behavior of Tantalum alloy T-111 is necessary to predict device integrity in the heat source section of Radioisotope Thermoelectric Generators (RTGs) at the end of service life, in the event of a fuel fire. High pressures exist in RTGs near the end of service life, these are caused by gas generation resulting from radioactive decay of the nuclear fuel. The internal pressure exerts a significant hoop stress on the T-111 alloy structural containment member. This paper analyses the short term creep behavior (rupture times up to {similar to}2{times}10{sup 3} hrs.) of cold worked (CW) T-111 alloy, using the existing data of Stephenson (1967). Corellations for the time to rupture, time to 1% strain and minimum creep rate have been obtained from this data using multivariable linear regression analysis. These results are compared to other short term rupture data for T-111 alloy. Finally, at the stress/temperature levels relevant to the RTG fuel fire scenario near the end of service life, the rupture time correlation for T-111 alloy predicts a rupture time of approximately 100 hrs.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5814124
- Report Number(s):
- CONF-910116-; CODEN: APCPC
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 217:1; Conference: 8. symposium on space nuclear power systems, Albuquerque, NM (USA), 6-10 Jan 1991; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
07 ISOTOPES AND RADIATION SOURCES
30 DIRECT ENERGY CONVERSION
TANTALUM ALLOY-T111
RUPTURES
TANTALUM BASE ALLOYS
THERMOELECTRIC GENERATORS
SAFETY ENGINEERING
CREEP
RADIOISOTOPE HEAT SOURCES
REGRESSION ANALYSIS
SERVICE LIFE
STRESS ANALYSIS
ALLOY-TA90W8HF
ALLOYS
DIRECT ENERGY CONVERTERS
ENGINEERING
FAILURES
HAFNIUM ALLOYS
HEAT SOURCES
MATHEMATICS
MECHANICAL PROPERTIES
STATISTICS
TANTALUM ALLOYS
TUNGSTEN ALLOYS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
360103* - Metals & Alloys- Mechanical Properties
070300 - Isotopic Power Supplies
070500 - Isotope & Radiation Source Technology- Health & Safety- (1990-)
300302 - Thermoelectric Generators- Performance & Testing