Considerations pertaining to the achievement of high burn-ups in HTR fuel

摘要

The satisfactory irradiation performance of coated fuel particles up to burn-ups of, say 10/100, has been demonstrated in the past. However, it is shown that some of the most important physical properties of their constituents, which determine this good performance, are only poorly known. This ignorance is likely to become more serious when particles are required to attain higher burn-up values. For example, neutron dose limits above which the anisotropy of the pyrocarbon layers become unacceptably high need to be established.