Long-term performance assessment of grouted phosphate/sulfate waste from N Reactor operations

Sewart, G.H.; Farris, W.T.; Huizenga, D.G.; McMakin, Andrea H.; Streile, G.P.; Treat, R.L.

doi:10.2172/6304334

Cited by 10 publications

(14 citation statements)

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“…Both processes use the same type of dry solids, and the major constituents in the waste solutions are the same (i.e., NAN03, NAN02, NaAI(OH)4 and NaOH). (Lokken et al 1987), radioactive grout leach testing (Serne et al 1987), performance assessments (Sewart et al 1987), and pilot-scale tests (Fow et al 1987). A major pilot-scale test was performed in 1986 with a simulated phosphate/sulfate waste (PSW) to assess the effectiveness of the grouting operations and to characterize the grout produced with pilot-scale equipment and cured in a large mass.…”

Section: 4mentioning

confidence: 99%

Characterization of double-shell slurry feed grout produced in a pilot-scale test. Hanford Grout Technology Program

Lokken¹,

Martin²,

Shade³

1992

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Section: 4mentioning

confidence: 99%

Characterization of double-shell slurry feed grout produced in a pilot-scale test. Hanford Grout Technology Program

Lokken¹,

Martin²,

Shade³

1992

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“…The Hanford Defense Waste Environmental Impact Statement (EIS) (DOE 1987) provides an overview of potential impacts from a wide range of activities. The Hanford Grout Performance Assessment studies are more detailed modeling efforts that provide guidance for engineering waste containment options (Sewart et al 1987). The study reported here is a preliminary screening to provide input to the plan for characterizing radioactive and chemical wastes in the Hanford SSTs (Winterset al 1989).…”

Section: This Study Is One Of Several Past and Ongoing Efforts Considmentioning

confidence: 99%

“…This farm exposure scenario provides a means of computing potential health impacts for comparative purposes based on Hanfordarea information. This exposure scenario was patterned after a similar scenario used in the Hanford Grout Performance Assessment (Sewart et al 1987). The only major difference in approach was a result of different study objectives, a hypothetical well location was selected that was closer than the 5-km downgradient location.…”

Section: Based On Information From Past Studies At the Hanford Site mentioning

confidence: 99%

“…A constant thickness of 4.57 m was used to model where the hypothetical well intercepts the saturated zone for all tank farm groups. This thickness represents a maximum limit of vertical mixing and was selected to be consistent with previous modeling efforts for the Hanford Grout Performance Assessment studies (Sewart et al 1987). Water concentrations are computed 5.3 (a) These values are taken directly from MEPAS Application Guidance Document (Droppo et al 1989).…”

Section: Hydrologic Parameters For the Textural Units In The Unsaturamentioning

confidence: 99%

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Single-shell tank constituent rankings for use in preparing waste characterization plans

Droppo¹,

Buck²,

Wilbur³

et al. 1991

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This effort is part of the initial exploratory characterization efforts for mixed wastes in underground single-shell tanks (SSTs) at the U.S. Department of Energy's (DOE) Hanford Site being conducted in accordance with DOE's waste characterization plan (Winterset al. 1g89). The purpose of this analysis was to provide a preliminary ranking of the constituents in the SST waste and provide information for use in establishing detection limits for the analytical characterization of the wastes. This report documents past efforts for use in ongoing SST characterization efforts. The bulk of the efforts described were conducted from April 1988 to September 1989. Since then, only minor corrections and updates have been made. Although the results from these efforts have been one source of information in the ongoing process of defining contaminants, the lists and their rationale are no longer current. The early nature of these efforts is evident in the use of tank groupings other than operable units that have been subsequently defined by the Federal Facilities Agreement and Consent Order (Tri-Party Agreement). This report provides a starting point for a planned update of the efforts described in this report.

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“…Because the tank is impervious, the radionucl ide concentrations inside the tank are immaterial. The textural descriptions of the samples (Sewart et al 1987) were compared with descriptions of the five stratigraphic units identified at the T Tank Farm. This comparison is shown in Table 5.1.…”

Section: Boundary and Initial Conditionsmentioning

confidence: 99%

Three-dimensional contaminant plume dynamics in the vadose zone: Simulation of the 241-T-106 single-shell tank leak at Hanford

L¹,

Sagar²

1990

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SUMMARYApproximately 2,000 m3 (115,000 gallons) of 1 iquid containing radioactive and chemical wastes leaked from the 241-T-106 single-shell tank at the -U.S. Department of Energy's Hanford Site in southcentral Washington in 1973.The leak discharged into the unsaturated, coarse-grained sediments of the Hanford formation which underlie the base of the tank. The extent of the i contaminant plume in the vadose zone was estimated in 1973 and 1978 by gamma spectrometry in dry wells drilled to monitor the leak. The leak provides an excellent opportunity to test the applicability of the PORFLO-3 Version 1.0 computer code for studying flow and transport in the vadose zone. IThe PORFLO-3 computer code was used to study plume migration for 1 0 6~~ and 137~s. The flow and transport properties of the soils through which the plume has migrated are critical input data for the model but are not available. Consequently, information from a catalogue of Hanford Site soil properties was used. The transient magnitudes and locations of the plume were simulated in three dimensions.Using viscosities and hydraulic conductivities for the tank fluid that are equal to that of water, the plume of 1 0 6~~ simulated for 1973 was larger than that which was measured. By reducing the hydraulic conductivity for saturated conditions in the vertical direction by one-half, the dimensions of the simulated 1 0 6~~ plume approximate those of the measured plume. Such reduction is justified because of the uncertainty inherent in the hydraulic conductivity data and because the tank fluid is more viscous than water. The plume of 1 3 7~s simulated for 1973 approximates that which was measured, assuming a reasonable distribution coefficient to account for the sorption of 1 -cesium by minerals of the Hanford formation. . -Using the reduced vertical hydraul ic conductivity, the migration of 1 0 6~~ and 1 3 7~s was simulated for the time between 1973 and 1990. (The gamma spectrometry measurement in 1978 suggests that the 1 0 6~~ did not move after 1973.) The plume simulated for 1978 and 1990, however, does not show this behavior; it appears to have expanded significantly since 1973. Because 1 0 6~~ may have a small sorption coefficient, a simulation was made that assumed a distribution coefficient of 0.5 for ruthenium. Use of this coefficient, however, did not result in a stationary 1 0 6~~ plume; the simulated plume continued to expand after 1973. This value is reasonable based on information in the literature. How---ever, the use of the distribution coefficient did not accurately reproduce the lateral spreading of the observed plume, and the simulated plume expanded 4 .significantly after 1973. I -The simulated plume of cesium for 1978 and 1990 did not move significantly from that measured and simulated for 1973. This static condition likely resulted from the sorption of cesium by minerals of the Hanford formation. bSimulations of the 241-T-106 tank leak indicate that PORFLO-3 Version 1.0 should be able to represent the transient behavior of a threedimension...

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Long-term performance assessment of grouted phosphate/sulfate waste from N Reactor operations

Cited by 10 publications

References 0 publications

Characterization of double-shell slurry feed grout produced in a pilot-scale test. Hanford Grout Technology Program

Characterization of double-shell slurry feed grout produced in a pilot-scale test. Hanford Grout Technology Program

Single-shell tank constituent rankings for use in preparing waste characterization plans

Three-dimensional contaminant plume dynamics in the vadose zone: Simulation of the 241-T-106 single-shell tank leak at Hanford

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