Fission gas release from high burnup ThO/sub 2/ and ThO/sub 2/-UO/sub 2/ fuels irradiated at low temperature. (LWBR/AWBA development program). [LWBR, below 2700/sup 0/F]
Fission gas release data are presented for five fuel rods irradiated at low fuel temperature (below 2700/sup 0/F) with burnups up to 90,000 MWD/MTM. Four of these rods contained ThO/sub 2/-UO/sub 2/ (33.6 weight percent UO/sub 2/) fuel pellets; the fifth rod contained ThO/sub 2/ pellets. These data supplement fission gas release information previously reported for 54 rods containing ThO/sub 2/-UO/sub 2/ and ThO/sub 2/ fuel, some of which experienced fuel temperaures up to 5000/sup 0/F and burnups to 56,000 MWD/MTM. These new data suggest that at burnups exceeding about 80,000 MWD/MTM a sharp increase in fission gas release occurs, possibly caused by microstructural changes in the fuel. This is similar to the behavior of UO/sub 2/ except that the increase occurs in UO/sub 2/ at lower burnup (approximately 40,000 MWD/MTM). The fission gas release calculational model previously reported has been modified to account for the observed increase in the low temperature component. The revised model provides a good best estimate of all the fission gas release data.
- Research Organization:
- Bettis Atomic Power Lab., Pittsburgh, PA (USA)
- DOE Contract Number:
- AC11-76PN00014
- OSTI ID:
- 5108999
- Report Number(s):
- WAPD-TM-1350-Add.2; ON: DE82014873
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
050700 -- Nuclear Fuels-- Fuels Production & Properties
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
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ACTINIDE COMPOUNDS
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CHALCOGENIDES
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FUEL RODS
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OXIDES
OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
REACTOR COMPONENTS
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URANIUM COMPOUNDS
URANIUM DIOXIDE
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WATER COOLED REACTORS
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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
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ACTINIDE COMPOUNDS
BREEDER REACTORS
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FUEL ELEMENTS
FUEL RODS
LWBR TYPE REACTORS
OXIDES
OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
REACTOR COMPONENTS
REACTORS
THERMAL REACTORS
THORIUM COMPOUNDS
THORIUM OXIDES
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES
VERY HIGH TEMPERATURE
WATER COOLED REACTORS
WATER MODERATED REACTORS