Time-temperature-dose rate superposition: A methodology for predicting cable degradation under ambient nuclear power plant aging conditions
Time-temperature superposition is an empirical approach that has been used in polymers for more than 30 years to make thermal aging predictions at experimentally inaccessible times. Given the historical success of time-temperature superposition, we have expanded this approach for combined radiation-thermal environments, yielding an empirical time-temperature-dose rate shifting procedure. The procedure derives an isothermal curve for a given amount of material damage versus dose rate at a selected reference temperature by finding the Arrhenius activation energy that causes higher-temperature dose-rate data to superpose when shifted to the reference temperature. The resulting superposed curve at the reference temperature expends to much lower dose rates that, in effect, are experimentally inaccessible due to the long time periods which would be required. This procedure therefore allows meaningful predictions to be made under long-term, low-dose rate, radiation aging conditions. Using historical data from our radiation-aging program on nuclear power plant cable materials, we have successfully applied the time-temperature-dose rate superposition approach to four different materials. For two of these materials, extrapolated predictions based on the superposed data were found to be in excellent agreement with 12-year, low-dose rate nuclear power plant results.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6814772
- Report Number(s):
- SAND-88-0754; ON: DE89001582
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ELECTRIC CABLES
AGING
NUCLEAR POWER PLANTS
COMPARATIVE EVALUATIONS
ELECTRICAL INSULATION
EXPERIMENTAL DATA
MECHANICAL PROPERTIES
NEOPRENE
OXIDATION
POLYETHYLENES
PVC
RADIATION EFFECTS
TEMPERATURE EFFECTS
CABLES
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
CONDUCTOR DEVICES
DATA
ELASTOMERS
ELECTRICAL EQUIPMENT
EQUIPMENT
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
NUCLEAR FACILITIES
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYOLEFINS
POLYVINYLS
POWER PLANTS
THERMAL POWER PLANTS
220200* - Nuclear Reactor Technology- Components & Accessories
360605 - Materials- Radiation Effects
360603 - Materials- Properties