Post-irradiation examination of capsule P13T
Postirradiation examination revealed excellent performance of the H-451 and TS-1240 graphite bodies and fuel rods irraidated to a peak fluence of 8.0 x 10/sup 25/ n/m/sup 2/ (E > 29 fJ)/sub HTGR/ and to a peak volume-average fuel rod temperature of 1215/sup 0/C. A range of fuel rod variables was tested matrix filler graphite, shim particles, compositions; no variable was detrimental to the rod integrity. Particle batches with coating designs representative of the LHTGR (Large HTGR) design requirements exhibited fair irradiation performance to full fast neutron exposure ((8.0 x 10/sup 25/ n/m/sup 2/) (E > 29 fJ)/sub HTGR/) and burnups of 75%. True in-service particle failures were concluded to be <0.3% for all P13T particles. The observed failure was attributed to the outer pyrolytic carbons (OPyC) layer. The failure fraction for 32 P13T fuel rods are greater than predicted, but the mean observed value is less than predicted up to fast fluences of approx. 6.0 x 10/sup 25/ n/m/sup 2/ (E > 29 fJ)/sub HTGT/ at 50% confidence. Incipient degradation of the SiC coating due to palladium attack was observed in the HEU UC/sub 2/-TRISO and the UCO (oxygen/uranium ratio (O/U) = 0.64) fuel rods.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- DOE Contract Number:
- AT03-76ET35300
- OSTI ID:
- 5919321
- Report Number(s):
- GA-A-15608; ON: DE82002983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COATED FUEL PARTICLES
PERFORMANCE TESTING
FUEL RODS
HTGR TYPE REACTORS
COATINGS
FUEL ELEMENT FAILURE
IRRADIATION CAPSULES
MICROSTRUCTURE
ORR REACTOR
POST-IRRADIATION EXAMINATION
PYROLYTIC CARBON
SILICON CARBIDES
THORIUM OXIDES
URANIUM CARBIDES
URANIUM OXIDES
ACCIDENTS
ACTINIDE COMPOUNDS
CARBIDES
CARBON
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
ENRICHED URANIUM REACTORS
FUEL ELEMENTS
FUEL PARTICLES
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTORS
SILICON COMPOUNDS
TANK TYPE REACTORS
TESTING
THORIUM COMPOUNDS
URANIUM COMPOUNDS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210300* - Power Reactors
Nonbreeding
Graphite Moderated