Design calculations for eddy-current displacement sensors for Chalk River Nuclear Laboratories (AECL)

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An analysis has been made of four different types of eddy-current sensors to measure the displacement of a fuel tube contained coaxially in a pressure tube. The first sensor consisted of a bifilar coil encircling the pressure tube. Its sensitivity was inadequate. The second sensor was bifilar coil inside the pressure tube and encircling the fuel tube. This coil had adequate sensitivity to the swelling of the fuel cladding but could not measure its bowing. The third sensor consisted of an array of eight pancake coils spaced around the fuel cladding and inside the pressure tube. This sensor could measure ... continued below

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Pages: 15

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Dodd, C.V. February 1, 1978.

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Description

An analysis has been made of four different types of eddy-current sensors to measure the displacement of a fuel tube contained coaxially in a pressure tube. The first sensor consisted of a bifilar coil encircling the pressure tube. Its sensitivity was inadequate. The second sensor was bifilar coil inside the pressure tube and encircling the fuel tube. This coil had adequate sensitivity to the swelling of the fuel cladding but could not measure its bowing. The third sensor consisted of an array of eight pancake coils spaced around the fuel cladding and inside the pressure tube. This sensor could measure both bowing and swelling of the cladding independently, but was subject to fairly large drifts. The fourth sensor used eight pancake coils that measured the distance to spring-loaded feelers that directly contacted the fuel cladding. This was the most sensitive device and exhibited the smallest drift. None of the sensors could measure the temperature of the fuel cladding because the temperature was not a single valued function of the resistivity over the specified range of 20 to 1200/sup 0/C.

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Pages: 15

Notes

Dep. NTIS, PC A02/MF A01.

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  • Report No.: ORNL/TM-6160
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/5148219 | External Link
  • Office of Scientific & Technical Information Report Number: 5148219
  • Archival Resource Key: ark:/67531/metadc1058360

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • February 1, 1978

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:06 p.m.

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Dodd, C.V. Design calculations for eddy-current displacement sensors for Chalk River Nuclear Laboratories (AECL), report, February 1, 1978; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1058360/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.