Deep-Burn Modular Helium Reactor Fuel Development Plan by D McEachern; ORNL

By D McEachern; ORNL

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Extra info for Deep-Burn Modular Helium Reactor Fuel Development Plan

Sample text

This Demonstration MHR will first be operated with commercial LEU TRISO-coated fissile and TRISO-coated natural uranium fertile fuel. After initial satisfactory operation with uranium fuels, test elements containing DF will be introduced into the Demonstration MHR core. When satisfactory operation of DF test fuel has been demonstrated, then test elements containing both DF and TF will be introduced. Finally, scaleable DF and TF fabrication facilities will be established and the Demonstration MHR core will be converted in stages to all DF/TF fuel for a demonstration of transmutation in the DB-MHR operating mode.

Following FSV fuel development, and starting in the 1980s, there was a New Production Reactor (NPR) design (for tritium production) and a series of MHR designs considered for commercial 3-11 GA-224-0-TRT-000167, Rev. S. 9% enriched) fissile kernel, consisting a uranium oxycarbide (UO2 and UC2 mixture), traditionally referred to as UCO. The NPR fuel kernel was HEU UCO, of 200 µm diameter. The MHR fertile fuel kernel was initially ThO2, but later selected to be natural uranium UCO, of 500 µm diameter.

Structural isotropy is known to be a key material property correlated with PyC dimensional stability under irradiation, but optical anisotropy (BAFo), the technique currently used QC technique, does not correlate well with OPyC failure data. Furthermore, the BAFo values measured for the IPyC coatings in the fuel irradiated in HRB-21 and in the NPR capsules were well within the specified limits. Thus, the acceptable range of BAFo, as specified in current uranium fuel specifications, appears to be an inadequate indicator of the both IPyC and OPyC coating performance under irradiation.

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