Analysis of fuel dispersal in direct electrical heating experiments
Description
The effects of transient history on fuel motion driven by fission gas have been investigated in a series of direct-electrical-heating tests on quartz-clad irradiated fuel. Variations in the slow, Stage-I portion of the transient thermal history resulted in pronounced differences in fuel behavior during the subsequent, more rapid, Stage-II portion. Analysis of transient fission-gas behavior, considering both the timing of gas release to grain boundaries and the non-equilibrium character of grain-boundary gas bubbles, provides a coherent picture of the role of fission gas in the observed fuel failure. The results indicate the conditions under which fission gas may efficiently drive expulsion of molten fuel through cracks, as well as conditions under which gross radial swelling of the fuel may be expected. These predictions are compatible with the observed nature of fuel failure
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Additional details
Additional titles
- Augmented title (English)
- LMFBR
Publishing Information
- Imprint Title
- Specialists' workshop on predictive analysis of material dynamics in LMFBR safety experiments, March 13-15, 1979
- Journal Page Range
- p. 269-279.
- Report number
- LA--7938-C
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 11517542
- Subject category
- S61: RADIATION PROTECTION AND DOSIMETRY; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Descriptors DEI
- FUEL ELEMENT FAILURE; LIQUID FLOW; LMFBR TYPE REACTORS; REACTOR CORE DISRUPTION; REACTOR SAFETY; SIMULATION
- Descriptors DEC
- ACCIDENTS; BREEDER REACTORS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FLUID FLOW; LIQUID METAL COOLED REACTORS; REACTOR ACCIDENTS; REACTORS; SAFETY