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14 Parameter Limit Element diameter range 0.174 to 0.832 in. Element length range 1 to 152 in. Cladding thickness 0.010 to .125 in. Observed accuracy 5 for pressure and volume Laser type Nd-YAG Element diameter range 0.174 to 0.832 in. Maximum energy per pulse 20 Joules Rated average power 150 W Pulse repetition rate 1 to 150 pulses per second pps Beam width 0.25 in. Final lens focal length 4 in. Minimum spot diameter 0.005 in. Pressure and Vacuum Instrumentation Sealing head pressure 0 to 200 0.1 psia Manifold pressure 0 to 50 0.01 psia Manifold vacuum 1 atm to 10 millitorr 5 millitorr Sample line vacuum 1 atm to 10 millitorr 5 millitorr Sample line pressure 0 to 50 0.01 psia Table 4. Gas assay sample and recharge system specifications. Sample preparation Irradiated fuel cladding and structural materials are sectioned mounted into metal- lographic bases ground and polished in the containment box located in the HFEF main cell. The containment box has its own argon atmosphere and atmosphere control system to prevent cross contamination with the main cell. Irradiated samples prepared in the containment box are pneumatically transferred to the box where they are examined by either the Leitz metallograph or a digital microhardness tester. The pneumatic transfer system also connects to the Analytical Laboratory.