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- W4246456316 abstract "Fracture studies were made on two batches of SGHWR pressure tubing. One of the batches had a normal grain size and structure, while the other was coarse grained due to overheating during heat treatment. The aim was to determine the critical crack length of the tubes under reactor operating conditions, and the effect on the critical lengths of embrittlement by hydrogen absorption and neutron irradiation damage. Tubes were measured directly where possible, while supplementary data were obtained from tests on small specimens, enabling the effects of embrittlement to be predicted. The coarse-grained tube was found to be much more susceptible to hydrogen and irradiation embrittlement than the fine-grained tube, and it is expected that the critical length would be reduced from an initial 4 in. to about 1.5 in. at the end of life. In contrast the critical length of the fine-grained material would only be reduced from 5 in. to approximately 3.5 in. Résumé Des essais de rupture ont été faits sur deux lots de tubes de force SGHWR. Léun de ces lots avait une taille de grain et une structure normales tandis que le second avait de gros grains dûs à une surchauffe lors des traitements thermiques. Le but de cette étude était de déterminer la longueur critique des fissures des tubes dans les conditions d'opération et l'effet sur cette longueur critique de la fragilisation par l'hydrogène adsorbé et par irradiation aux neutrons. Quand ce fut possible les essais furent effectués sur les tubes et des données supplémentaires furent obtenues par des essays sur petits échantillons, ceci permettant de prédire les effets de la fragilisation. Le tube à gros grains était plus sensible à la fragilisation par hydrogène et par irradiation et il est preévu que la longueur critique sera réduite de 4 à 1.5 pouces a la fin de la vie utile. Pour le tube à grain fin par contre cette longueur ne serait réduite que de 5 à 3.5 pouces environ." @default.
- W4246456316 created "2022-05-12" @default.
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- W4246456316 date "1972-01-01" @default.
- W4246456316 modified "2023-10-18" @default.
- W4246456316 title "Embrittlement of heat-treated Zr-2.5 wt% Nb pressure tubes" @default.
- W4246456316 doi "https://doi.org/10.1179/000844372795257917" @default.
- W4246456316 hasPublicationYear "1972" @default.
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