Inhibiting localized corrosion during storage of dilute SRP wastes
High-level radioactive waste will be incorporated in borosilicate glass in the Defense Waste Processing Facility (DWPF) at the Savannah River Plant (SRP). As part of this process, large volumes of inorganic salt wastes will be decontaminated for disposal as low-level waste. The principal contaminants, /sup 137/Cs and /sup 90/Sr, are removed by treatment with sodium tetraphenylborate and sodium titanate. The resulting solids will be slurried with a dilute salt solution and stored in existing carbon steel tanks for several years prior to processing and disposal. Initial tests indicated a tendency for localized corrosion of the tanks. An investigation, using nonradioactive simulants for the expected solution compositions, identified inhibitors which would protect the steel. Changes in solution compositions over time, due to radiolytic effects, were also accounted for by the simulants. Six inhibitors were identified which would protect the steel tanks. The effects these inhibitors would have on later processing steps in the DWPF were then evaluated. After this process, only sodium nitrite remained as an inhibitor that was both effective and compatible with the DWPF. The use of this inhibitor has been demonstrated on a real waste slurry.
- Research Organization:
- Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
- DOE Contract Number:
- AC09-76SR00001
- OSTI ID:
- 7000324
- Report Number(s):
- DP-MS-86-139; CONF-870306-15; ON: DE87005828
- Resource Relation:
- Conference: Waste management '87, Tucson, AZ, USA, 1 Mar 1987; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CORROSION INHIBITORS
LOW-LEVEL RADIOACTIVE WASTES
TANKS
CORROSION PROTECTION
LIQUID WASTES
NITRITES
SALTS
SODIUM COMPOUNDS
ALKALI METAL COMPOUNDS
CONTAINERS
MATERIALS
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage