Out-of-reactor tests were made on three types of reactor nozzle to Zircaloy-2 process tube connections for use in the 1706 KER in-reactor high-temperature pressurized water test facilities. Threaded connections , with O-ring seals made from solid stainless steel wire proved to be the best of the three types and were selected for in-reactor use. Tapered thread connections were found to be stronger than straight thread connections. Van Stone flange connections using Flexitallic gasket seals were satisfactory, but were rejected because of fabrication difficulties. Compression fitting connec¬tions with special nickel gasket seals were rejected as being too weak and unreliable for in-reactor use.
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