LOMI (low oxidation-state transition metal ion) decontamination reagents and related preoxidation processes: Final report

Technical Report · Tue Dec 01 04:00:00 EST 1987

OSTI ID:5746519

Swan, T; Segal, M G; Williams, W J; Pick, M E

The development of the LOMI decontamination system is described covering aspects from the initial laboratory oxide dissolution studies through to the application on a full reactor primary circuit. Limited work on advanced LOMI reagents for the dissolution of chromium containing oxide is also described. The optimization of potassium-permanganate based pre-oxidation reagents for high chromium oxides is discussed, leading to the establishment of the dilute NP (nitric permanganate) and AP (alkaline permanganate) reagents for use in combination with LOMI and also the POD (PWR oxidative decontamination) system using NP and citrox reagents. An outline of the extensive materials compatibility studies required to clear the reagents for reactor use is given. Much of this work has been conducted by organizations independent of the CEGB, e.g., United Kingdom Atomic Energy Authority, General Electric, Agesta Project. For such work overall conclusions only are presented. A wide range of materials corrosion work has been undertaken in the joint CEGB/EPRI studies and some more sensitive issues such as the corrosion of Stellite have been addressed in detail. Waste management techniques have been developed to minimize the volume of arisings. These involve both the optimization of reagent composition to avoid use of excess chemicals and also the development of ion exchange techniques for the direct treatment of pre-oxidation reagents and for the control of reagent pH. The kinetics of chromium leaching using ozone as a pre-oxidation reagent have been investigated in detail since this gives low waste arisings.

• Research Organization: Central Electricity Generating Board, Berkeley (UK). Berkeley Nuclear Labs.
• OSTI ID: 5746519
• Report Number(s): EPRI-NP-5522-M; ON: TI88920110
• Country of Publication: United States
• Language: English

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PIPES
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