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97088 EROSION/CORROSION CONCERNS IN FEED PREPARATION SYSTEMS AT THE DEFENSE WASTE PROCESSING FACILITY

Picture for 97088 EROSION/CORROSION CONCERNS IN FEED
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Product Number: 51300-97088-SG
ISBN: 97088 1997 CP
Author: J. T. Gee, G. T. Chandles, W.L. Daugherty, K J. Imrich, C. F. Jenkins
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The Savannah River site (srs) has been operating a nuclear fuel cycle since the 1950's to produce nuclear materials in support of the national defense effort. The Department of Energy authorized the construction of the Defense Waste Processing Facility (DWPF) to immobilize the high level radioactive waste resulting from these processes as a durable borosilicate glass. The (DWPF), after having undergone extensive testing, has been approved for operations and is currently immobilizing radioactive waste. To ensure reliability of the DWPF remote canyon processing equipment, a materials evaluation program was performed prior to radioactive operations to determine to what extent erosion/corrosion would impact design life of equiment. The program consisted of performing pre-service baseline inspections on critical equipment and follow-up inspections after completion of the DWPF cold chemical demonstration runs. Non-destructive examination (NDE) techniques were used to assess erosion/corrosion as well as evaluation of corrosion coupon racks. These results were used to arrive at predicted equipment life for selected feed preparation equipment. It was concluded with the exception of the coil and agitator for the slurry mix evaporator (SME), which are exposed to errosive glass frit particles, all of the equipment should meet its design life. Keywords: high level waste, DWPF, borosilicate glass, melter, erosion, corrosion.
The Savannah River site (srs) has been operating a nuclear fuel cycle since the 1950's to produce nuclear materials in support of the national defense effort. The Department of Energy authorized the construction of the Defense Waste Processing Facility (DWPF) to immobilize the high level radioactive waste resulting from these processes as a durable borosilicate glass. The (DWPF), after having undergone extensive testing, has been approved for operations and is currently immobilizing radioactive waste. To ensure reliability of the DWPF remote canyon processing equipment, a materials evaluation program was performed prior to radioactive operations to determine to what extent erosion/corrosion would impact design life of equiment. The program consisted of performing pre-service baseline inspections on critical equipment and follow-up inspections after completion of the DWPF cold chemical demonstration runs. Non-destructive examination (NDE) techniques were used to assess erosion/corrosion as well as evaluation of corrosion coupon racks. These results were used to arrive at predicted equipment life for selected feed preparation equipment. It was concluded with the exception of the coil and agitator for the slurry mix evaporator (SME), which are exposed to errosive glass frit particles, all of the equipment should meet its design life. Keywords: high level waste, DWPF, borosilicate glass, melter, erosion, corrosion.
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