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Conference Article: Non-destructive test of HTGR graphite components

Ishihara, M.; Ishii, T.; Ishiyama, S.; Eto, M. (Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Dept. of High Temperature Engineering)

Abstract

Prototype NDT model units for HTTR graphite components was constructed and optimizing regulation tests of eddy-current Nondestructive Test (NDT) units and NDT for drill hole on the surface of plates made of IG-110 and PGX graphites were carried out. From those test results, the following conclusions were derived:

  1. Recommendable probe-testing material distance (lift-off) and scanning speed for the evaluation of diameter of drill hole on the surface of graphite plates are within 0.1mm to 0.3mm and 25mm/s to 30mm/s respectively, however, for the evaluation of depth of drill hole, more than 30mm/s scanning speed should be chosen.
  2. Measurable minimum diameter and maximum depth of drill hole measured by C-scan technique were 2mm and 3mm on the surface of IG-110 and PGX graphite plates.

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key words: graphite; holes; httr reactor; materials testing; nondestructive testing; reactor components; carbon; enriched uranium reactors; experimental reactors; gas cooled reactors; graphite moderated reactors; helium cooled reactors; htgr type reactors
Reference:
Specialists' meeting on the status of graphite development for gas cooled reactors. Tokai, Ibaraki (Japan). 9-12 Sep 1991
International Atomic Energy Agency, Vienna (Austria)
IAEA-TECDOC--690, pp:291-298