Effects of fast-neutron irradiation on sheathed Chromel/Alumel thermocouples
Stainless steel sheathed, magnesium oxide insulated, Chromel-P/Alumel thermocouples were tested by irradiation in the EBR-II reactor to determine their suitability for use in the Fast Test Reactor at the Hanford Engineering Development Laboratory. After exposure to high temperature (1200/sup 0/F) and fast-flux irradiation (2 x 10/sup 22/ nvt) in the reactor, there were small changes in the thermocouple characteristics. The measured error of these thermocouples was 2 percent at 1200/sup 0/F. Thermoelectric inhomogeneities were generated in the Chromel and Alumel wires in opposite polarities with respect to unirradiated wires. These inhomogeneities were annealed at temperatures above 900/sup 0/F. The outer diameter of the sheath increased no more than 1.2 percent. Irradiated thermocouples can be expected to perform satisfactorily in this environment and would survive many thermal cycles such as might occur in a reactor scram.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7267723
- Report Number(s):
- ORNL/TM-3803
- Country of Publication:
- United States
- Language:
- English
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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
FFTF REACTOR
THERMOCOUPLES
HIGH TEMPERATURE
PERFORMANCE TESTING
PHYSICAL RADIATION EFFECTS
THERMAL CYCLING
EPITHERMAL REACTORS
FAST REACTORS
LIQUID METAL COOLED REACTORS
MEASURING INSTRUMENTS
RADIATION EFFECTS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SODIUM COOLED REACTORS
TEST REACTORS
TESTING
220600* - Nuclear Reactor Technology- Research
Test & Experimental Reactors
440200 - Radiation Effects on Instrument Components
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