Low-pressure hydraulic technique for slurrying radioactive sludges in waste tanks

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Description

Present technology for the removal of sludges from radioactive liquid waste storage tanks at the Savannah River Plant (SRP) requires large volumes of fresh water added through high-pressure (approx.3000 psig) nozzles positioned to resuspend and slurry the sludge. To eliminate the cost of storing and evaporating these large volumes of water (several hundred thousand gallons per tank cleaned), a technique was developed at the Savannah River Laboratory (SRL) to use recirculating, radioactive, supernate solution to resuspend the sludge. The system consists in part of a single-stage centrifugal pump operating in the sludge at approx.100 psia. Recirculating supernate is drawn into ... continued below

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Pages: 31

Creation Information

Bradley, R.F.; Parsons, F.A.; Goodlett, C.B. & Mobley, R.M. November 1, 1977.

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  • Savannah River Laboratory
    Publisher Info: Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
    Place of Publication: Aiken, South Carolina

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Description

Present technology for the removal of sludges from radioactive liquid waste storage tanks at the Savannah River Plant (SRP) requires large volumes of fresh water added through high-pressure (approx.3000 psig) nozzles positioned to resuspend and slurry the sludge. To eliminate the cost of storing and evaporating these large volumes of water (several hundred thousand gallons per tank cleaned), a technique was developed at the Savannah River Laboratory (SRL) to use recirculating, radioactive, supernate solution to resuspend the sludge. The system consists in part of a single-stage centrifugal pump operating in the sludge at approx.100 psia. Recirculating supernate is drawn into the bottom of the pump and forced out through two oppositely directed nozzles to give liquid jets with a sludge-slurrying capability equal to that obtained with the present high-pressure system. In addition to eliminating the addition of large quantities of water to the tanks, the low-pressure recirculating technique requires only approximately one-sixth of the power required by the high-pressure system. Test results with clay (as a simulant for sludge) in a waste tank mockup confirmed theoretical predictions that jets with the same momentum gave essentially the same sludge-slurrying patterns. The effective cleaning radius of the recirculating jet was directly proportional to the product of the nozzle velocity and the nozzle diameter (U/sub 0/D). At the maximum U/sub 0/D developed by the pump (approx.14 ft/sup 2//s), the effective cleaning radius in the tank mockup was approx.20 feet.

Physical Description

Pages: 31

Notes

Dep. NTIS, PC A03/MF A01.

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  • Report No.: DP-1468
  • Grant Number: EY-76-C-09-0001
  • DOI: 10.2172/5325029 | External Link
  • Office of Scientific & Technical Information Report Number: 5325029
  • Archival Resource Key: ark:/67531/metadc1074495

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • November 1, 1977

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

Description Last Updated

  • May 10, 2018, 9:23 p.m.

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Bradley, R.F.; Parsons, F.A.; Goodlett, C.B. & Mobley, R.M. Low-pressure hydraulic technique for slurrying radioactive sludges in waste tanks, report, November 1, 1977; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc1074495/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.