Observation and Measurement of Se-79 in SRS High-Level Tank Fission Product Waste

Title: Observation and Measurement of Se-79 in SRS High-Level Tank Fission Product Waste

Full Record
Similar

Abstract

The authors report the first observation of confirmed Se-79 activity in Savannah River Site high level fission product waste. Se-79 was measured after a seven step chemical treatment to remove interfering activity from Cs-137, Sr-90, and plutonium at levels 105 times higher than the observed Se-79 content and to remove Tc-99 at levels 300 times higher than observed Se-79. Se-79 was measured by liquid scintillation beta-decay counting after specific tests to eliminate uncertainties from possible contributions from Tc-99, Pm-147, Sm-151, Zr-93, or Pu-241, whose beta-decay spectra could appear similar to that of Se-79, and whose content would be expected at levels near or greater than Se-79.

Authors:: Dewberry, R.A.

Publication Date:: Mon Aug 21 00:00:00 EDT 2000

Research Org.:: Savannah River Site (US)

Sponsoring Org.:: US Department of Energy (US)

OSTI Identifier:: 761147

Report Number(s):: WSRC-MS-99-00341
TRN: US0004385

DOE Contract Number:: AC09-96SR18500

Resource Type:: Conference

Resource Relation:: Conference: Conference title not supplied, No location, No date; Other Information: PBD: 21 Aug 2000

Country of Publication:: United States

Language:: English

Subject:: 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; SELENIUM 79; FISSION PRODUCTS; SAVANNAH RIVER PLANT; LIQUID SCINTILLATION DETECTORS; TANKS; HIGH-LEVEL RADIOACTIVE WASTES; CONCENTRATION RATIO

Citation Formats


                    Dewberry, R.A. Observation and Measurement of Se-79 in SRS High-Level Tank Fission Product Waste.  United States: N. p., 2000. 
        Web.

Copy to clipboard


                    Dewberry, R.A. Observation and Measurement of Se-79 in SRS High-Level Tank Fission Product Waste.  United States.

Copy to clipboard


                    Dewberry, R.A. Mon .  
        "Observation and Measurement of Se-79 in SRS High-Level Tank Fission Product Waste".  United States.  
        doi:.  https://www.osti.gov/servlets/purl/761147.

Copy to clipboard


                    
@article{osti_761147,

  title        = {Observation and Measurement of Se-79 in SRS High-Level Tank Fission Product Waste},

  author       = {Dewberry, R.A.},

  abstractNote = {The authors report the first observation of confirmed Se-79 activity in Savannah River Site high level fission product waste. Se-79 was measured after a seven step chemical treatment to remove interfering activity from Cs-137, Sr-90, and plutonium at levels 105 times higher than the observed Se-79 content and to remove Tc-99 at levels 300 times higher than observed Se-79. Se-79 was measured by liquid scintillation beta-decay counting after specific tests to eliminate uncertainties from possible contributions from Tc-99, Pm-147, Sm-151, Zr-93, or Pu-241, whose beta-decay spectra could appear similar to that of Se-79, and whose content would be expected at levels near or greater than Se-79.},

  doi          = {},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Aug 21 00:00:00 EDT 2000},

  month        = {Mon Aug 21 00:00:00 EDT 2000}

}

Copy to clipboard

Conference:

View Conference (0.05 MB)

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Measurement of unsaturated hydraulic properties of salt cake simulant relevant to hanford and SRS high-level waste tanks using a pilot-scale setup

Tachiev, G. ; Yaari, G. ; Long, S. ; ...

Closure of the remaining tanks and final disposition of the radioactive waste is a high priority task at both Savannah River Site (SRS) and Hanford. The radioactive waste in the tanks are generally found in layers: supernate (on top) containing soluble fission products, and salt-cake and sludge (on the bottom of the tank) containing insoluble actinides. One strategy for minimizing the waste volume is to segregate the low curie salt waste from the high curie salt supernate by draining the supernate and interstitial salt solution from the salt-cake. The retrieval of the interstitial fluid will require knowledge of relevant propertiesmore »« less
Semivolatile fission product behavior in high-level waste vitrification

Hanson, M. S. ; McElroy, J. L.

The solidification of high-level wastes is being evaluated as a method for final control of high-level nuclear wastes. The high temperatures required in the solidification process cause the volatilization of small amounts of fission products, primarily ruthenium and cesium. In order to determine cleanup requirements, a good understanding must be gained as to the quantities of fission products volatilized and how these quantities relate to operating conditions. The Pacific Northwest Laboratory, operated by Battelle-Northwest for the U.S. Department of Energy, has been investigating ruthenium and cesium volatilization in various calciners. Studies have been made using both simulated (nonradioactive) and radioactivemore »« less
Full Text Available
Increased hydrogen release from a Savannah River Site high-level waste storage tank due to sparging: Measurement and modeling results

Lee, L.M. ; Walker, D.D.

During normal operations at the Savannah River Site (SRS), tanks containing high-level radioactive waste are continuously ventilated to prevent accumulation of hydrogen gas within the vapor space. However, during some maintenance operations, the ventilation is temporarily halted. During a 1990 ventilation outage, hydrogen accumulated in a tank vapor space much more rapidly than expected. The accelerated rate of hydrogen evolution was traced to an air sparge within the tank solution which significantly increased the rate of hydrogen mass transfer from the liquid waste to the vapor space.
Full Text Available
Evaluation of nebulizer performance within the ICP-MS measurement system for analysis of SRS radiological waste tank simulated solutions

Jones, V.D.

High level radioactive waste tanks at the Savannah River Site are high in salt content. The average Total Dissolved Solids (TDS) content is approximately 25%. For ICP-MS optimum signal stability and to reduce blockage of nebulizers and sampling orifices, it is usual to limit analyte solutions to a TDS content of nominally < 0.2%. Dilution to this level to reduce the matrix effect may push some analytes of interest below detectable levels. Five commercially available nebulizers were evaluated in a field study as part of the ICP-MS measurement system for their performance in a high salt matrix. The nebulizers surveyedmore »« less
Alternative Chemical Cleaning Methods for High Level Waste Tanks: Actual Waste Testing with SRS Tank 5F Sludge

King, William D. ; Hay, Michael S.

Solubility testing with actual High Level Waste tank sludge has been conducted in order to evaluate several alternative chemical cleaning technologies for the dissolution of sludge residuals remaining in the tanks after the exhaustion of mechanical cleaning and sludge sluicing efforts. Tests were conducted with archived Savannah River Site (SRS) radioactive sludge solids that had been retrieved from Tank 5F in order to determine the effectiveness of an optimized, dilute oxalic/nitric acid cleaning reagent toward dissolving the bulk non-radioactive waste components. Solubility tests were performed by direct sludge contact with the oxalic/nitric acid reagent and with sludge that had beenmore »« less
DOI: 10.2172/1323875

Full Text Available