Published November 1996
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Increase of volume swelling by a temperature gradient
Description
The temperature gradient in the cladding of a Fast Reactor fuel pin leads to increased dilatation compared to material irradiations. Investigations of a specially designed fuel pin reached the conclusion that the cause is enhanced volume swelling. It is induced by He-bubbles, which migrate upwards the temperature gradient and coalesce. The critical size of nuclei for void swelling is thus reached much faster. Consequently, the p in deformation is larger than expected from materials irradiations, in the present case (DIN 1.4981 sa) by about 50%. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Der Temperaturgradient in der Huellwand eines Brennstabs von Schnellen Brutreaktoren fuehrt zu einer Vergroesserung der Huellaufweitung verglichen mit Materialbestrahlungen. Untersuchungen an einem dafuer speziell gestalteten Brennstab fuehrten zu dem Schluss, dass die Ursache hierzu verstaerktes Porenschwellen ist. Dieses wird durch Heliumblaeschen herbei gefuehrt, welche im Temperaturgradienten wandern und durch Koaleszenz wachsen koennen. Somit wird der kritische Porenkeimradius schneller erreicht, als ohne Gradienten. Foglich ergibt sich hier eine groessere Huellaufweitung als man aus Materialbestrahlungen erwarten konnte, beim vorliegenden Material (DIN 1.4981 lg) um etwa 50%. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 23 p.
- ISSN
- 0947-8620
- Report number
- FZKA--5841
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 28021903
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Descriptors DEI
- BUBBLES; COALESCENCE; FUEL CANS; FUEL PINS; HELIUM; IRRADIATION; LMFBR TYPE REACTORS; STEEL-CR16NI16MONB; SWELLING; TEMPERATURE GRADIENTS; VOIDS
- Descriptors DEC
- ALLOYS; AUSTENITIC STEELS; BREEDER REACTORS; CARBON ADDITIONS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-MOLYBDENUM STEELS; CHROMIUM-NICKEL STEELS; CHROMIUM-NICKEL-MOLYBDENUM STEELS; CORROSION RESISTANT ALLOYS; DEFORMATION; ELEMENTS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FUEL ELEMENTS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; LIQUID METAL COOLED REACTORS; MATERIALS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NIOBIUM ADDITIONS; NONMETALS; RARE GASES; REACTOR COMPONENTS; REACTORS; STAINLESS STEELS; STEELS; TRANSITION ELEMENT ALLOYS