In situ calibration of nuclear plant resistance thermometers using Johnson noise. Draft
Methods have been demonstrated in operating nuclear plants for the in situ calibration of resistance thermometers with agreement between measured noise temperatures and dc calibration temperatures well within these required by the plant. A comparison of the results of Johnson noise power testing results and uncertainties, the requirements for accuracy, and PRT calibration tolerances is shown. The methods use Johnson noise measurements and provide an absolute calibration independent of the prior dc calibration. The methods include techniques for characterization of the installed extension cables and the quantitative determination of induced EMI and its effect on the calibration. The techniques are applicable to ordinary 4-wire platinum resistance thermometers operating over their entire design temperature range and to extension cables of about 100 ft length. Careful attention needs to be paid to the choice or cables, location of terminal boxes, and grounding and shielding practices in the plant installation to achieve comparable results.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6061815
- Report Number(s):
- CONF-8409109-7; ON: DE85004434
- Resource Relation:
- Conference: Industrial temperature measurement symposium, Knoxville, TN, USA, 10 Sep 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
NUCLEAR POWER PLANTS
THERMOMETERS
CALIBRATION
WATER COOLED REACTORS
NOISE
NOISE THERMOMETERS
IN CORE INSTRUMENTS
MEASURING INSTRUMENTS
NUCLEAR FACILITIES
POWER PLANTS
REACTOR INSTRUMENTATION
REACTORS
THERMAL POWER PLANTS
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