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13 Hot Fuel Examination Facility Fission Gas Measurement and Analysis Fission gas puncture and analysis is performed using the HFEF Gas Assay Sample and Recharge GASR system and gas mass spectrometry. This equipment provides the abil- ity to puncture cylindrical capsules or fuel elements in their plenum regions to measure free volume and pressure and gather a sample for gas composition and isotopic analyses. The system comprises a 150-watt Nd-YAG pulsed laser shielded opti- cal and gas cell-wall feed-through a mechanical pump calibrated vol- umes gauges and controls. Fuel ele- ments or capsules are positioned on the laser by a clamp onto a neoprene gasket. The gasket provides a seal between the element and laser seal head. Void volume is determined by a series of backfills into the punctured fuel rod and expansions into the GASR system. The fuel rod internal gas pressure is derived from the void volume measurement and fission gas puncture pressure measurement. Fission gas composition is analyzed by a gas mass spectrometer to provide krypton Kr and xenon Xe isotopic and total elemental composition. The rodlet void volume and internal gas pressure uncertainty is 5 in the range of 0.03 to 60 liter-atmospheres. The isotopic and elemental analysis uncertainty is 1-5 depending on the relative abundance of the analyte. Schematic of GASR system.