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98324 CHARACTERIZATION AND DISSOLUTION STUDIES OF BRUCE UNIT 3 STEAM GENERATOR SECONDARY SIDE DEPOSITS

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Product Number: 51300-98324-SG
ISBN: 98324 1998 CP
Author: J. Semmler, P. J. Leinonen
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The physical and chemical properties of secondary side steam generator deposits in the form of powder and flake obtained from Bruce Nuclear Generating Station A (BNGS A) Unit 3 were studied. The chemical phases present in both types of deposits, collected prior to the 1994 chemical cleaning during the pre-clean water lancing compaign, were magnetite (Fe3O4), metallic copper (Cu), hematite (Fe203) and cuprous oxide (Cu2O). The major difference between the chemical composition of the powder and the flake was the presence of zinc silicate (Zn2SiO4) and several unidentified silicate phases containing Ca, Al, Mn, and Mg in the flake. The flake deposit had high hardness values, high electrical resistivity, low porosity and a lower dissolution rate in the EPRI-SGOG (Electric Power Research Institute-Steam Generator Owner’s Group) chemical cleaning solvents compared to the powder deposit. Differences in the deposit properties after chemical cleaning of the Unit 3 steam generators and after laboratory cleaning were noted. The presence of silicates in the deposit inhibit magnetite dissolution. Keywords: Secondary side deposit, flake, zinc silicate, magnetite, chemical cleaning
The physical and chemical properties of secondary side steam generator deposits in the form of powder and flake obtained from Bruce Nuclear Generating Station A (BNGS A) Unit 3 were studied. The chemical phases present in both types of deposits, collected prior to the 1994 chemical cleaning during the pre-clean water lancing compaign, were magnetite (Fe3O4), metallic copper (Cu), hematite (Fe203) and cuprous oxide (Cu2O). The major difference between the chemical composition of the powder and the flake was the presence of zinc silicate (Zn2SiO4) and several unidentified silicate phases containing Ca, Al, Mn, and Mg in the flake. The flake deposit had high hardness values, high electrical resistivity, low porosity and a lower dissolution rate in the EPRI-SGOG (Electric Power Research Institute-Steam Generator Owner’s Group) chemical cleaning solvents compared to the powder deposit. Differences in the deposit properties after chemical cleaning of the Unit 3 steam generators and after laboratory cleaning were noted. The presence of silicates in the deposit inhibit magnetite dissolution. Keywords: Secondary side deposit, flake, zinc silicate, magnetite, chemical cleaning
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