Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Reexamination Certificate
2011-04-26
2011-04-26
Carrillo, Sharidan (Department: 1711)
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
C134S022100, C134S022110, C134S022130, C134S022140, C134S022190, C134S026000, C134S027000, C134S029000, C134S030000, C134S035000, C134S036000, C134S042000, C510S108000, C510S109000, C510S375000, C510S435000
Reexamination Certificate
active
07931753
ABSTRACT:
A method to remove deposits containing magnetite and copper from a container, particularly from a steam generator of a nuclear power plant. In a first step, the container is treated using an alkaline cleaning solution containing a complexing agent forming a soluble complex with iron ions, a reducing agent, and an alkalizing agent. In a second step a further complexing agent forming a more stable complex with iron III ions than the complexing agent used in the first step and an oxidant are added to the cleaning solution of the first step present in the container.
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International Search Report dated Jun. 23, 2008.
Batchuluun Enkhtsetseg
Bitter Konrad
Hollwedel Ursula
Areva NP GmbH
Carrillo Sharidan
Greenberg Laurence A.
Locher Ralph E.
Sterner Werner H.
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