Data Compilation for AGR-2 Variant Coated Particle Batch G73J-14-93073A
Coated particle fuel batch G73J-14-93073A was produced by the Babcock and Wilcox Company (B&W) for possible selection as UCO variant fuel for the Advanced Gas Reactor Fuel Development and Qualification Program's AGR-2 irradiation test. Batch G73J-14-93073A 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 pyrocarbon layer (40 μm nominal thickness). For this variant, argon was added to the hydrogen fluidization gas during SiC deposition. 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-B7958 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 fuel specification to allow comparison to historical measurements. Average OPyC open porosity was determined using a single sample to be 0.41 ml/m². One possible SiC soot inclusion was found in a sample of 4729 particles. This corresponds to <1E-3 defect fraction at 95% confidence.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1649224
- Report Number(s):
- ORNL/TM-2008/134; TRN: US2202181
- Country of Publication:
- United States
- Language:
- English
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