Fast Flux Test Facility (FFTF) feedback reactivity components
Conference
·
OSTI ID:6736907
The static tests conducted during Cycle 8A (1986) of the FFTF have allowed, for the first time, the experimental determination of each of the feedback reactivities caused by the following mechanisms: fuel axial expansion, control rod repositioning, core radial expansion, and subassembly bowing. A semiempirical equation was obtained to describe each of these feedback components that depended only on the relevant reactor temperature (bowing was presented in a tabular form). The Doppler and sodium density reactivities were calculated using existing mechanistic methods. Although they could also be fitted with closed-form equations depending only on temperatures, these equations are not needed in transient analyses using whole core safety computer codes, which use mechanistic methods. The static feedback reactivity model was extended to obtain a dynamic model via the concept of ''time constants.'' Besides being used for transient analyses in the FFTF, these feedback equations constitute a database for the validation and/or calibration of mechanistic feedback reactivity models. 2 refs., 6 tabs.
- Research Organization:
- Westinghouse Hanford Co., Richland, WA (USA)
- DOE Contract Number:
- AC06-87RL10930
- OSTI ID:
- 6736907
- Report Number(s):
- WHC-SA-0286; CONF-880506-26; ON: DE89001108
- Country of Publication:
- United States
- Language:
- English
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·
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500* -- Power Reactors
Breeding
220600 -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
COMPUTER CODES
CONTROL ELEMENTS
DATA ANALYSIS
EPITHERMAL REACTORS
FAST REACTORS
FEEDBACK
FFTF REACTOR
FUEL ELEMENTS
LIQUID METAL COOLED REACTORS
M CODES
MATHEMATICAL MODELS
REACTIVITY
REACTOR COMPONENTS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SODIUM COOLED REACTORS
TEST REACTORS
210500* -- Power Reactors
Breeding
220600 -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
COMPUTER CODES
CONTROL ELEMENTS
DATA ANALYSIS
EPITHERMAL REACTORS
FAST REACTORS
FEEDBACK
FFTF REACTOR
FUEL ELEMENTS
LIQUID METAL COOLED REACTORS
M CODES
MATHEMATICAL MODELS
REACTIVITY
REACTOR COMPONENTS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SODIUM COOLED REACTORS
TEST REACTORS