Mechanisms of in-pile fission gas release from UO$sub 2$

Journal Article · Mon Oct 01 04:00:00 EDT 1973 · J. Nucl. Mater., v. 48, no. 3, pp. 253-263

OSTI ID:4368661

Shiba, K; Handa, M; Yamagishi, S; Fukuda, T; Takahashi, Y; Tanifuji, T; Omori, S; Kondo, A

In-pile release mechanisms of fission gas from UO/sub 2/ at low temperatures were studied. The release of /sup 133/Xe, /sup 135/Xe, /sup 138/Se, 2/ pellet was measured at temperatures ranging from 250 to 930 deg C using a graphite specimen holder. The release from the holder, in which a fraction of fission gas recoil-implanted, was subtracted to obtain the net release from the UO/sub 2/ pellet. Knock-out release from the UO/sub 2/ was measured directly, and it was found that it was not the main release mechanism, at least not for short-lived nuclides. A pseudo-recoil'' release model is proposed to explain the low temperature release under irradiation. In the model, some of the defects produced by fission fragments act as shortlived carriers for fission gas. (6 figures, 23 references) (auth)

• Research Organization: Japan Atomic Energy Inst., Tokai
• NSA Number: NSA-29-007621
• OSTI ID: 4368661
• Journal Information: J. Nucl. Mater., v. 48, no. 3, pp. 253-263, Journal Name: J. Nucl. Mater., v. 48, no. 3, pp. 253-263; ISSN JNUMA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*FISSION PRODUCTS-- DIFFUSION
*URANIUM DIOXIDE-- FISSION PRODUCTS
DEGASSING
GASES
HIGH TEMPERATURE
IRRADIATION
KNOCK-ON
LOSSES
N40300 --Chemistry--Radiation Chemistry
N40410 --Chemistry--Radiochemistry & Nuclear Chemistry--Hot Atom Chemistry
N40420* --Chemistry--Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
N50140 --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Radiation Effects
RECOILS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE