In-situ calibration of nuclear-plant platinum resistance thermometers using Johnson noise methods. Final report. [PWR; BWR]

Technical Report · Wed Jun 01 04:00:00 EDT 1983

OSTI ID:6119675

Blalock, T V; Shepard, R L

Methods for in situ calibration of reactor plant platinum resistance thermometers using Johnson noise measurements were tested in the laboratory and in two operating reactors: Diablo Canyon and Sequoyah. The Johnson noise methods provide an absolute measurement of the thermometer temperature and can be compared with the dc calibration of the thermometers to confirm their calibration without removing the thermometers from the plant coolant loops. Inaccuracies of less than 0.1% were obtained with these methods for ideal situations where the noise measuring equipment could be connected directly to the installed thermometer terminals. For measurements made at the ends of long extension cables, inaccuracies were 0.5 to 1.0%, at best. Extension cables must be optimized and well characterized electrically to achieve such accuracies. Other factors that affect the accuracy of these methods were evaluated.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6119675
• Report Number(s): EPRI-NP-3113; ON: DE83014087
• Country of Publication: United States
• Language: English

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