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Nondestructive Evaluation on Hydrided LWR Fuel Cladding by Small Angle Incoherent Neutron Scattering of Hydrogen

Published online by Cambridge University Press:  09 January 2014

Y. Yan ,
S. Qian ,
K. Littrell ,
C. M. Parish ,
G. L. Bell  and
L. K. Plummer
Y. Yan
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
S. Qian
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
K. Littrell
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
C. M. Parish
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
G. L. Bell
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
L. K. Plummer
Affiliation:
University of Oregon, Eugene, OR 97403, U.S.A.
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Abstract

A non-destructive neutron scattering method was developed to precisely measure the uptake of total hydrogen in nuclear grade Zircaloy-4 cladding. The hydriding apparatus consists of a closed stainless steel vessel that contains Zircaloy-4 specimens and hydrogen gas. By controlling the initial hydrogen gas pressure in the vessel and the temperature profile, target hydrogen concentrations from tens of ppm to a few thousands of ppm have been successfully achieved. Following hydrogen charging, the hydrogen content of the hydrided specimens was measured using the vacuum hot extraction method (VHE), by which the samples with desired hydrogen concentration were selected for the neutron study. Small angle incoherent neutron scattering (SAINS) were performed in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). Our study indicates that a very small amount (≈ 20 ppm) hydrogen in commercial Zircaloy-4 cladding can be measured very accurately in minutes for a wide range of hydrogen concentration by a nondestructive method. The hydrogen distribution in a tube sample was obtained by scaling the neutron scattering rate with a factor, which is determined by calibration process with direct chemical analysis method on the specimen. This scale factor can be used for future test with unknown hydrogen concentration, thus provide a nondestructive method for absolute hydrogen concentration determination.

Keywords

neutron scatteringZrH
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1653: Symposium MM – Neutron Scattering Studies of Advanced Materials , 2014 , mrsf13-1653-mm03-07
Copyright
Copyright © Materials Research Society 2014 

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References

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