Coolant boiling in the beginning-of-life core during overpower excursions. [LMFBR]
Conference
·
OSTI ID:7361896
A hypothetical unprotected transient overpower accident (TOP) in the fresh and near fresh LMFBR core may involve coolant boiling prior to cladding failure for relatively slow transients. Coolant boiling on the cladding surface is a possible failure mechanism postulated for overpower transients. An assessment is made of the implications of bulk boiling if boiling initiation precedes failure, when the pumps are fully operational. The beginning-of-life core is defined, the salient features of the analytical model are summarized, and a means to represent the core hydrodynamics with a manageable system of equations is presented. The specific characterization of the boiling phenomenon within the context of the current version of MELT is discussed, and the initial aspects of the fuel-coolant interaction process in a previously voided region are considered.
- Research Organization:
- Hanford Engineering Development Lab., Richland, Wash. (USA)
- OSTI ID:
- 7361896
- Report Number(s):
- HEDL-SA-993; CONF-751101-90
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500 -- Power Reactors
Breeding
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ALKALI METALS
BOILING
BREEDER REACTORS
ELEMENTS
EPITHERMAL REACTORS
EXCURSIONS
FAST REACTORS
FBR TYPE REACTORS
FUEL ELEMENT FAILURE
FUEL-COOLANT INTERACTIONS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
METALS
PHASE TRANSFORMATIONS
REACTOR ACCIDENTS
REACTORS
SODIUM
210500 -- Power Reactors
Breeding
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ALKALI METALS
BOILING
BREEDER REACTORS
ELEMENTS
EPITHERMAL REACTORS
EXCURSIONS
FAST REACTORS
FBR TYPE REACTORS
FUEL ELEMENT FAILURE
FUEL-COOLANT INTERACTIONS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
METALS
PHASE TRANSFORMATIONS
REACTOR ACCIDENTS
REACTORS
SODIUM