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

Abstract

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.

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab., Tenn. (USA)
OSTI Identifier:
5148219
Report Number(s):
ORNL/TM-6160
TRN: 78-007387
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; DISPLACEMENT GAGES; PERFORMANCE TESTING; FUEL ELEMENTS; PRESSURE TUBE REACTORS; EDDY CURRENT TESTING; SPECIFICATIONS; ELECTROMAGNETIC TESTING; MATERIALS TESTING; MEASURING INSTRUMENTS; NONDESTRUCTIVE TESTING; REACTOR COMPONENTS; REACTORS; TESTING; 210400* - Power Reactors, Nonbreeding, Otherwise Moderated or Unmoderated

Citation Formats

Dodd, C. V. Design calculations for eddy-current displacement sensors for Chalk River Nuclear Laboratories (AECL). United States: N. p., 1978. Web. doi:10.2172/5148219.
Dodd, C. V. Design calculations for eddy-current displacement sensors for Chalk River Nuclear Laboratories (AECL). United States. doi:10.2172/5148219.
Dodd, C. V. Wed . "Design calculations for eddy-current displacement sensors for Chalk River Nuclear Laboratories (AECL)". United States. doi:10.2172/5148219. https://www.osti.gov/servlets/purl/5148219.
@article{osti_5148219,
title = {Design calculations for eddy-current displacement sensors for Chalk River Nuclear Laboratories (AECL)},
author = {Dodd, C. V.},
abstractNote = {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.},
doi = {10.2172/5148219},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {2}
}