General extrapolation model for an important chemical dose-rate effect
In order to extrapolate material accelerated aging data, methodologies must be developed based on sufficient understanding of the processes leading to material degradation. One of the most important mechanisms leading to chemical dose-rate effects in polymers involves the breakdown of intermediate hydroperoxide species. A general model for this mechanism is derived based on the underlying chemical steps. The results lead to a general formalism for understanding dose rate and sequential aging effects when hydroperoxide breakdown is important. We apply the model to combined radiation/temperature aging data for a PVC material and show that this data is consistent with the model and that model extrapolations are in excellent agreement with 12-year real-time aging results from an actual nuclear plant. This model and other techniques discussed in this report can aid in the selection of appropriate accelerated aging methods and can also be used to compare and select materials for use in safety-related components. This will result in increased assurance that equipment qualification procedures are adequate.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5941829
- Report Number(s):
- NUREG/CR-4008; SAND-84-1948; ON: TI85007517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360406* -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
AGING
CABLES
CHEMICAL RADIATION EFFECTS
CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
CONDUCTOR DEVICES
DOSE RATES
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATION
EQUIPMENT
HALOGENATED ALIPHATIC HYDROCARBONS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
POWER PLANTS
PVC
RADIATION CHEMISTRY
RADIATION EFFECTS
THERMAL POWER PLANTS