ARMY REACTORS PROGRAM PROGRESS REPORT
Research and development on metallurglcal aspects of pressurized-water systems is summarized. A survey was made of the methods of determining fuel burnup. The mechanisms and kinetics of the loss of boron during heating at 1135 deg C in various dynamic environments were determined. A model was developed to quantitatively characterize the UO/sup 2/ dispersion microstructure of roll-clad fuel plates relative to an ideal'' dispersion. In order to avoid the loss of boron from UO//sub 2/- stainless steel dispersion fuel plates during fabrication, studies were carried out on a refractory glass containing 4 wt.% B/sub 2/O/sub 3/. By using lowsilicon elemental powder, the undesirable reaction between Eu/sub 2/O/ sub 3/ and Si was eliminated; and 13 full-size SM-1 absorbers were fabricated. Work was continued on the borongradient neutron absorber concept. A design was studied for preparing a composite control rod having an upper section made of a boron-gradient dispersion and the lower tip made of Eu/sub 2/O/sub 3/ and stainless steel. Two fuel elements were examined after significant exposure in SM-1. The examination of the miniature boron-iron samples in the final phase of the MTR irradlation test was performed. Twelve miniature test specimens containing 20, 30, or 40 wt % Eu/sub 2/.O/sub 3/ were placed in the ETR for test. No defects were found in a control rod rack of 17-4 PH stainless steel removed after 3 years of operation in the SM-1. M.C.G.)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-16-011234
- OSTI ID:
- 4801397
- Report Number(s):
- ORNL-3231
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
BORON
BORON OXIDES
BURNUP
CANNING
CHEMICAL REACTIONS
CONTROL
CONTROL ELEMENTS
COOLANT LOOPS
DEFECTS
DISPERSIONS
EUROPIUM OXIDES
FABRICATION
FAILURES
FUEL ELEMENTS
FUELS
GLASS
HEATING
HIGH TEMPERATURE
IRON ALLOYS
IRRADIATION
LOSSES
MATERIALS TESTING
MEASURED VALUES
METALLURGY
MOCKUP
PLANNING
PLATES
POISONING
POWDERS
POWER PLANTS
PRESSURE
RADIATION EFFECTS
REACTIVITY
REACTOR SAFETY
REACTOR TECHNOLOGY
REFRACTORIES
RODS
ROLLING
SAMPLING
SILICON
SM-1
STAINLESS STEELS
URANIUM DIOXIDE
WATER COOLANT
BORON
BORON OXIDES
BURNUP
CANNING
CHEMICAL REACTIONS
CONTROL
CONTROL ELEMENTS
COOLANT LOOPS
DEFECTS
DISPERSIONS
EUROPIUM OXIDES
FABRICATION
FAILURES
FUEL ELEMENTS
FUELS
GLASS
HEATING
HIGH TEMPERATURE
IRON ALLOYS
IRRADIATION
LOSSES
MATERIALS TESTING
MEASURED VALUES
METALLURGY
MOCKUP
PLANNING
PLATES
POISONING
POWDERS
POWER PLANTS
PRESSURE
RADIATION EFFECTS
REACTIVITY
REACTOR SAFETY
REACTOR TECHNOLOGY
REFRACTORIES
RODS
ROLLING
SAMPLING
SILICON
SM-1
STAINLESS STEELS
URANIUM DIOXIDE
WATER COOLANT