The wastage of in-bed heat transfer surfaces has recently emerged as a potentially serious problem for both pressurized and atmospheric fluidized bed combustors. The experimental pressurized fluidized bed combustion facility at Grimethorpe has accumulated a considerable quantity of data covering the wastage of in-bed tubes obtained during a total of just over 3600 h of operation. The combustor operated with different tube banks, with some degree of wastage being experienced with each one. The data are described, evidence for possible solutions is presented, and plans for future tests at Grimethorpe to prove these solutions are outlined.

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The overall program approach is to conduct parallel analytical and experimental studies on mixed-oxide fuel pins with close liaison and feedback between the two activities. In the analytical work, the initial efforts will be directed to compiling all pertinent data on the irradiation behavior of austenitic stainless steel cladding, mixed-oxide fuel pins. A similar effort will be directed toward compiling data on the behavior of Type 316 austenitic stainless steel cladding-in particular on high-burnup fuel pins. These data will be analyzed by current theoretical models, and where required, new models and computer codes will be devised. These analytical techniques will be used to provide the technical basis for the experimental Irradiation programs. This procedure, in turn, will permit reliable parametric studies of design variables of interest to FFTF and LMFBR.