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Special technique at KRB A:. Decontamination of stainless steel parts with phosphoric acid. Electropolishing. quick processing time reliability less secondary waste maximal recycling effect. Principle of electropolishing. +. 6000 A at low voltage. bath with phosphoric acid. -.

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Special technique at KRB A:

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Special technique at krb a
Special technique at KRB A:

Decontamination of

stainless steel parts with

phosphoric acid

Electropolishing

  • quick processing time

  • reliability

  • less secondary waste

  • maximal recycling effect


Principle of electropolishing
Principle of electropolishing

+

6000 A

at low voltage

bath with phosphoric acid

-

before

after

Oxide skin

H2PO4

chemical or

electrochemical

Base material




Regeneration of phosphoric acid
Regeneration of Phosphoric Acid

  • Recycling of Phosphoric acid by

  • Reuse acid for decontamination

  • Thermolysis of iron oxalat

- adding oxalic acid

- precipitate the dissolved iron as

- iron oxalate

- extracting the iron oxalate

- vaporization

- heating the iron oxalate

- transformation into iron oxid for final storage





Example secondary steam generator
Example „Secondary Steam Generator“

Vessels of three Steam Generators

decontaminated from 20,000 Bq/cm²

to free release

producing only 1,5% radioactive waste


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