Data Compilation for AGR-2 Baseline Coated Particle Batch G73J-14-93072A
Coated particle fuel batch G73J-14-93072A was produced by the Babcock and Wilcox Company (B&W) for possible selection as UCO baseline fuel for the Advanced Gas Reactor Fuel Development and Qualification Program’s AGR-2 irradiation test. Batch G73J-14-93072A is a single batch of TRISO-coated 425 μm nominal diameter 14% low enrichment uranium oxide/uranium carbide kernels (LEUCO). The TRISO-coatings consist of a ~50% dense carbon buffer layer (100 μm nominal thickness) followed by a dense inner pyrocarbon layer (40 μm nominal thickness) followed by a SiC layer (35 μm nominal thickness) followed by another dense outer pryocarbon layer (40 μm nominal thickness). The AGR-2 Fuel Specification (INL SPC-923) provides the requirements necessary for acceptance of the fuel manufactured for the AGR-2 irradiation test. The bulk of the kernels and coated particle acceptance testing was performed at B&W and is not contained in this report. Sample NP-B7940 was sent to ORNL for supplemental characterization. The procedures for the limited characterization and qualification of the particles performed at ORNL are outlined in ORNL product inspection plan AGR-CHAR-PIP-09. The BAFo equivalent optical anisotropies of the inner and outer pyrocarbon layers are reported on Inspection Report Form IRF-09, with a determination as to whether the particle batch satisfied the specified parameters for this property. The batch was found to satisfy the AGR-2 Fuel Specification SPC-923, Rev. 1 for IPyC and OPyC anisotropy. Also provided in this data package are data on the true BAFo, average particle weight, OPyC open porosity, and SiC soot inclusion defect fraction. True BAFo is calculated as (1+N)/(1-N), where N is the diattenuation. This differs from equivalent BAFo = 1+3N, which is the calculation used by the fuel specification to allow comparison to historical measurements. Average OPyC open porosity was determined using a single sample to be 0.62 ml/m2. An unusually high SiC soot defect fraction was observed in this sample, mostly due to bands of porosity apparently resulting from a fabrication anomaly in the coating gas delivery system. This is discussed further in the pages following Data Report Form DRF-32.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1632082
- Report Number(s):
- ORNL/TM-2008/133; TRN: US2200846
- Country of Publication:
- United States
- Language:
- English
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