IMGA [Irradiated Microsphere Gamma Analyzer] examination of the Set No. 4 fuel under project work statement FD-20
Results of an examination of over 10,800 unbonded fuel particles from three irradiated spherical fuel elements by the Irradiated Microsphere Gamma Analyzer system are reported. The investigation was initiated to assess fission product behavior in LEU UO{sub 2} TRISO-coated fuel particles at elevated temperatures. Of the three spheres considered, one was reserved as a control and the other two were subjected to simulated accident-condition temperatures of 1600{degree}C and 1800{degree}C, respectively. For the control sphere and the sphere tested at 1600{degree}C, no statistical evidence of fission product release (cesium) from individual particles was observed. At fuel temperatures of 1800{degree}C, however, fission product release (cesium) from individual particles was significant and there was large particles-to-particle variation. At 1800{degree}C, individual particle release (cesium) was on average ten times the Kernforschungsanlage-measured integral spherical fuel element release value. Particle release data from the sphere tested at 1800{degree}C indicate that there may be two distinct modes of failure at fuel temperatures of 1800{degree}C and above. 5 refs., 9 figs., 9 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 455552
- Report Number(s):
- DOE/HTGR--88381; ORNL/TM--11455; ON: DE97003975
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
AVR REACTOR
CERIUM 144
CESIUM 134
CESIUM 137
COATED FUEL PARTICLES
EUROPIUM 154
EXPERIMENTAL DATA
FISSION PRODUCT RELEASE
GAMMA DETECTION
HFR REACTOR
HTGR TYPE REACTORS
IRRADIATION
POST-IRRADIATION EXAMINATION
RADIOISOTOPES
REACTOR SAFETY
RUTHENIUM 106
SLIGHTLY ENRICHED URANIUM
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 1000-4000 K
URANIUM DIOXIDE