A noninvasive technique for the evaluation of diversion cross flow at the inlet of a simulated fuel rod bundle
Diversion cross flow was characterized from a two-subchannel simulation of a nuclear fuel assembly using a gamma camera. The gamma camera alllowed external monitoring over the length of the test assembly, thereby eliminating experimental problems associated with flow partitioning and an isokinetic withdrawal system, allowing the possibility of noninvasive measurement. The experiment was performed by providing fixed but different flow rates to each subchannel. The higher mass flow rate stream was traced with a gamma-emitting radionuclide, /sup 99m/Tc pertechnetate. Activity in each subchannel was measured by the camera. Diversion length was found to be relatively small and strongly dependent on gap spacing. Effective lateral velocity through the gap was also evaluated. With some exceptions, the results were in good agreement with the predictions of the subchannel analysis computer code COBRA IIIC. At a high inlet axial mass velocity ratio of 4, however, the agreement with the prediction was poor.
- Research Organization:
- Columbia Univ., Dept. of Applied Physics and Nuclear Engineering, New York, NY (US)
- OSTI ID:
- 7013498
- Journal Information:
- Nucl. Technol.; (United States), Vol. 80:3
- Country of Publication:
- United States
- Language:
- English
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Diversion cross-flow mixing at the inlet of a simulated rod bundle using a gamma camera
Simulated nuclear fuel rod bundle using a gamma camera
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FUEL RODS
COMPUTER CODES
DESIGN
FLOW RATE
PERFORMANCE TESTING
ACTIVATION ANALYSIS
C CODES
GAMMA CAMERAS
NUCLEAR FUELS
REACTOR SAFETY EXPERIMENTS
SIMULATION
TECHNETIUM 99
TRACER TECHNIQUES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAMERAS
CHEMICAL ANALYSIS
ENERGY SOURCES
FUEL ELEMENTS
FUELS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MATERIALS
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
REACTOR COMPONENTS
REACTOR MATERIALS
TECHNETIUM ISOTOPES
TESTING
YEARS LIVING RADIOISOTOPES
220300* - Nuclear Reactor Technology- Fuel Elements
220400 - Nuclear Reactor Technology- Control Systems
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures