Immersion and Leach Tests on Solidified Decontamination Wastes from Dresden Unit 1
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IMMERSION AND LFACH TESTS ON SOLIDIFIED DECONTAMINATION WASTES FROM DRESDEN UNIT 1
ROBERT E. BARLETTA, JAY W. ADAMS, AND RICHARD E. DAVIS Nuclear Waste Management Division, Brookhaven National Laboratory Upton, NY 11973 ABSTRACT In order to provide technical support to the NRC, Brookhaven National Laboratory has performed leach tests and immersion tests using organic liquids and organic saturated water of concentrated decontamination waste solidified using a vinyl ester-styrene binder. The leach tests measured the release of Fe, Ni, and Co from these forms in deionized water, groundwater, and seawater. After 64 days, the mean fraction released normalized by V/S for iron was 5.1 + 1.9 x 10-3 cm in deionized 3 water, 7.1 + 1.1 x 10-3 cm in groundwater, and 9.0 + 3.2 x 10- cm in seawater. For nickel, 64 day release rates observed were 4.6 + 1.6 x 10-3 cm, 4.6 + 1.0 x 10-3 cm, and 5.9 + 0.6 x 10-3 cm in deionized water, ground59 water, and seawater, respectively. After 50 days, the Fe release rates were 5.9 + 0.7 x 10-3, 4.8 + 2.4 x 10-3, and 2.8 + 1.0 x 10-3 cm in 6 0 deionized water, groundwater, and seawater, respectively. For Co, the 50 day releases in the three respective leaching media were 6.0 + 1.7 x 3 3 10-3 cm, 6.8 + 1.0 x 10- cm, and 2.3 + 0.2 x 10- cm. Immersion tests of waste forms prepared at a solidification demonstration held at the Dresden Nuclear Power Station were conducted in toluene, xylene, and water saturated with toluene and xylene. During immersion of samples in
the pure organics, large changes in sample volume and weight were observed. Total weight changes of 9.6 + 0.3% and 21.6 + 0.7% were observed after 839 hours of immersion in xylene and toluene, respectively. Air drying of the samples led to an overall weight loss of 23.5 + 0.7% for xylene and 35.6 + 0.6% for toluene. Qualitatively, similar changes were observed for immersion tests using organic saturated water. Severe sample deterioration was observed in this case, however. The cause of this deterioration is not known. INTRODUCTION In an effort to decontaminate the primary cooling system of the Dresden Nuclear Power Station Unit No. 1, Commonwealth Edison Company (CECO) has proposed [1] the use of NS-l, a proprietary solvent containing chelating agents, produced by the Dow Chemical Company. After decontamination, the solvent waste will be concentrated by evaporation and solidified in 55-gallon drums with a vinyl ester-styrene polymer binder. In this waste, over 90% of the radionuclides present are isotopes of Co, Fe, and Ni. The waste will then be disposed of by commercial shallow land burial. The requirements for disposal of this waste are given in the environmental statement for the decontamination.[1]
In order to provide technical support for the requirements for disposal of this waste, BNL has conducted immersion tests of simulated waste forms containing NS-1 concentrate in toluene, xylene, and in water containing toluene and xylene. We have also conducted leach tests on the simulated waste solid to *Work carried out un
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