Deuterium concentration profiles at the rolled joints of CANDU fuel channels

A diffusion model is proposed to explain high concentrations of hydrogen isotopes seen in some rolled joints of CANDU reactors. Predicted concentration profiles emanating from the rolled joints into the Zr-2.5Nb pressure tubes suggest an early ingress event happens within the first six months of ope...

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Veröffentlicht in:	Journal of nuclear materials 2023-01, Vol.573, p.154128, Article 154128
Hauptverfasser:	McRae, G.A., Coleman, C.E.
Format:	Artikel
Sprache:	eng
Schlagworte:	CANDU pressure tubes Diffusion models of hydrogen ingress Rolled joints
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	A diffusion model is proposed to explain high concentrations of hydrogen isotopes seen in some rolled joints of CANDU reactors. Predicted concentration profiles emanating from the rolled joints into the Zr-2.5Nb pressure tubes suggest an early ingress event happens within the first six months of operation in some tubes. This event is consistent with gettering of hydrogen from the 403 stainless steel end-fittings by the pressure tubes.
ISSN:	0022-3115 1873-4820
DOI:	10.1016/j.jnucmat.2022.154128