Analysis Key information pertaining to fission product release Capsule components Cumulative inventory of fission products released from all fuel compacts in a capsule during irradiation Fuel compact gamma scanning Retained inventory of fission products in each individual fuel compact Deconsolidationleach-burn-leach Inventory of fission products retained in the compacts outside of the SiC layers Particle gamma counting Retained inventory of fission products in the particles 2.2.1. Analysis of irradiation capsule components for deposited fission products The major components of the irradiation capsules-including the metal shells and structural components, the graphite fuel holders, and graphite spacers at the ends of the capsules-were analyzed at INL to determine the cumulative inventories of fission products released from the compacts during the irradiation. As there were 12 compacts in each irradiation capsule, the data provide information on the total inventory of fission products released from all 12 fuel compacts; release from each compact cannot be derived from these data. The metal capsule shells were leached in acid to remove deposits. Analysis of the leach solutions included gamma spectrometry for gamma-emitting fission products, Sr separation and gas flow proportional counting for 90
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