Induced nuclear reactions: processes – systems – and elements – Fission reactor material treatment – Impurity removal
Patent
1997-04-08
1998-09-08
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Fission reactor material treatment
Impurity removal
376306, 376310, 134 3, 134 13, 510110, G21F 928
Patent
active
058056548
ABSTRACT:
A method for operating the LOMI decontamination process in a regenerative manner. The method incorporates an initial injection of a dilute LOMI solution (vanadous formate, picolinic acid and sodium hydroxide) into a decontamination circuit followed by operation of a small cluster of cation exchange columns during the decontamination process. The cation exchange resin is used to remove metals in the same manner as in prior decontamination processes but operation of the cation exchange resin is continued to allow picolinic acid initially bound to the cation exchange resin to be released and recycled to the LOMI solution. Operation of the cation exchange columns ceases after the picolinic acid has been released but before the metals (e.g. sodium, iron and vanadium) are released back to the LOMI solution. The cluster of cation exchange columns are operated according to a sequence wherein one column is releasing picolinic acid while another is binding picolinic acid. The method further includes continuous additions of vanadous formate and sodium hydroxide. Clean-up at the end of the method proceeds in the normal manner wherein larger cation and anion exchange columns are utilized. Because the concentration of the components is much lower than conventional LOMI processes, however, the amount of cation exchange resin required at this stage is greatly reduced.
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Bradbury David
Elder George Richard
Wood Christopher J.
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