Transient freezing of a flowing ceramic fuel in a steel channel. [LMFBR]
Journal Article
·
· Nucl. Sci. Eng.; (United States)
OSTI ID:7108336
The extent of penetration of flowing molten ceramic fuel in steel channels before solidification is a problem that arises in the analysis of hypothetical core disruptive accidents. Considerations of fuel crust behavior indicate that fuel freezing in steel channels can occur in two distinct ways that can be identified as conduction-limited freezing (fuel crust growth) and bulk freezing (fuel crust removal). Fuel crust removal can arise from two sources: (a) mechanical breakup and (b) melting heat transfer. Explicit formulas providing rough estimates of critical fuel crust removal conditions are presented. If the conditions in the fuel flow are such to prevent fuel crust growth then the steel wall melting can become severe. It is proposed here that steel ablation rapidly leads to fuel freezing in a bulk manner via turbulent mixing between the relatively ''cold'' molten steel and hot molten fuel. This steel ablation-induced freezing concept is used to obtain a simple expression for molten fuel penetration into steel channels.
- Research Organization:
- Argonne National Lab., IL
- OSTI ID:
- 7108336
- Journal Information:
- Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 61:3; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Mon Dec 31 23:00:00 EST 1984
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500 -- Power Reactors
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22 GENERAL STUDIES OF NUCLEAR REACTORS
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ACCIDENTS
ACTINIDE COMPOUNDS
ALLOYS
BREEDER REACTORS
CHALCOGENIDES
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
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FUEL ELEMENTS
FUEL PINS
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LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MELTDOWN
OXIDES
OXYGEN COMPOUNDS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR CORE DISRUPTION
REACTOR SAFETY
REACTORS
SAFETY
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210500 -- Power Reactors
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22 GENERAL STUDIES OF NUCLEAR REACTORS
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ACTINIDE COMPOUNDS
ALLOYS
BREEDER REACTORS
CHALCOGENIDES
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FLUID FLOW
FUEL CANS
FUEL ELEMENTS
FUEL PINS
FUEL-CLADDING INTERACTIONS
IRON ALLOYS
IRON BASE ALLOYS
LIQUID FLOW
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MELTDOWN
OXIDES
OXYGEN COMPOUNDS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR CORE DISRUPTION
REACTOR SAFETY
REACTORS
SAFETY
STAINLESS STEELS
STEELS
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES