NTA-based formulation for the chemical decontamination of nuclear power plants

Sorption behaviour of Co(II) and Cu(II) on chitosan in presence of nitrilotriacetic acid

“…Removal of 60 Co along with other radioactive nuclides is done through decontamination procedures where corrosion products deposited over nuclear reactor coolant circuit surfaces are dissolved using chemical formulations containing complexants such as NTA [24]. Both radioactive elements (extremely small quantity as chemical species) and non-radioactive elements are dissolved by the decontaminant formulations.…”

Hydrogen transport in the primary coolant of pressurised heavy water reactors

“…Dissolved ions in the chelant are continuously removed and the formulation is regenerated by an ion exchange purification circuit (Rufus et al, 1998). Due to the presence of chelants and low pH, decontamination formulation increases corrosion of carbon steel piping in the PHT system (Rufus et al, 2004a, b). During the decontamination process, hydrogen formed due to corrosion accumulates in the PHT storage tank.…”

“…Hydrogen generation by corrosion of carbon steel in the decontamination formulation at 90°C has been included (Rufus et al, 2004a, b). where Y 3− stands for the chelant.…”

Synthesis and Characterization of Imprinted Polymers for Radioactive Waste Reduction

“…Thus, frequent cleanup campaigns, otherwise known as decontamination campaigns, are necessitated. During such cleanup operation, which is generally done by continuous circulation of dilute chemical formulations containing complexants (dilute chemical decontamination), the metal ions are brought out into the solution and trapped by the ion-exchange resin beds that form a part of the cleanup circuit. − The primary cooling water circuits of pressurized heavy water reactors (PHWR), for example, are made of carbon steel . Hence, during chemical decontaminations of these reactors, a large quantity of ferrous ions (large part of which is nonradioactive) is released into the coolant.…”

“…[2][3][4] The primary cooling water circuits of pressurized heavy water reactors (PHWR), for example, are made of carbon steel. 3 Hence, during chemical decontaminations of these reactors, a large quantity of ferrous ions (large part of which is nonradioactive) is released into the coolant. Because there is cobalt impurity present in some of the alloys used (nickel-containing alloys and to some extent in carbon steel) and also there are some parts that are made of cobalt-containing alloys (e.g., Stellite, which has 50% cobalt), a small quantity of cobaltous ions also gets incorporated into the corrosion product oxides and gets activated to become radioactive cobalt.…”