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2.4 Sources of Error in Experimental Measurements and Calculations 19 2.4.1 Possible Errors in Measurements 19 2.4.2 Possible Errors Involved in the Use of the Constant-Potential Equations 3. CHARACTERIZATION AND HISTORY OF MATERIALS USED 3.1 Characterization Procedures for Pyrocarbon Coatings. ... 3.2 Properties of Coated Particles Used in the Annealing Experiments 3.3 Bonded Fuel Pellets 3.4 Irradiation Data 3.5 Ceramographic Examination of Coated Particles 3.5.1 Group A Coated Particles 3.5.2 Groups C and F Coated Particles 4. EXPERIMENTAL RESULTS 4.1 Results of Early Experiments 4.2 Experimental Results on the Release of Cesium 4.2.1 Typical Graphs of Cesium Release vs Annealing Time 4.2.2 Measured and Calculated Parameters Relating to Cesium Release 4.3 Experimental Results on the Release of Barium, Strontium, and Cerium IV Page 4.3.1 Graphs of Fission Product Release vs Annealing Time 4.3.2 Coated-Particle Dimensions and Other Data DISCUSSION OF RESULTS 50 5.1 The Apparent Cesium Diffusion Coefficients 5.2 Evidence of a Concentration Limit in the Outer Coating. . 5.3 Evidence of a Trapped Fraction of Cesium 5.4 Abrupt Changes in Source Potential 5.5 Distribution of Fission Products in an Annealed Fuel Pellet 5.6 Barium, Strontium, and Cerium Results RECOMJ"[ENDATIONS 6.1 The Diffusion Coefficient 6.2 Limit of Cesium Concentration in the Coating 6.3 The Partition Coefficient 6.4 Trapped Fraction of Cesium 6.

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Any turth&&f6uti , p 8 z Ln b any of other data t h e y gover ts, for f com p p n' s and for n subs' f * "

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