Demonstration of Simulated Waste Transfers From Tank Ay-102 to the Hanford Waste Treatment Facility

Adamson, Duane J.; Poirier, M.; Steeper, T. J.

doi:10.2172/1012548

Cited by 4 publications

(3 citation statements)

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“…While this batch transfer process does not match expected WTP feed logistics, it was demonstrated in previous testing that it does not impact the batch transfer consistency. 2 The continuous batch transfers were also used during Phase II.…”

Section: Simulantmentioning

confidence: 99%

Demonstration of Mixing and Transferring Settling Cohesive Slurry Simulants in the Ay-102 Tank

Adamson¹

2011

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Section: Simulantmentioning

confidence: 99%

Demonstration of Mixing and Transferring Settling Cohesive Slurry Simulants in the Ay-102 Tank

Adamson¹

2011

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“…Most recently, Adamson et al (2009b) conducted a small-scale demonstration of simulated waste transfers from Tank AY-102.…”

Section: Hanford Tank Operationsmentioning

confidence: 99%

The Role of Cohesive Particle Interactions on Solids Uniformity and Mobilization During Jet Mixing: Testing Recommendations

Gauglitz¹,

Wells²,

Bamberger³

et al. 2010

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Executive SummaryRadioactive waste that is currently stored in large underground tanks at the Hanford Site will be staged in selected double-shell tanks (DSTs) and then transferred to the Waste Treatment and Immobilization Plant (WTP). Before being transferred, the waste will be mixed, sampled, and characterized to determine if the waste composition meets the waste feed specifications. Washington River Protection Solutions (WRPS) is conducting a Tank Mixing and Sampling Demonstration Program to determine the mixing effectiveness of the current baseline mixing system that uses two jet mixer pumps to mobilize and mix waste in DSTs and to determine the adequacy of the planned sampling method. The overall purpose of the demonstration program is to mitigate the technical risk associated with the mixing and sampling systems meeting the feed certification requirements for transferring waste to the WTP.A critical aspect of meeting the feed certification requirements is ensuring that the collected samples will adequately represent the contents of the tank and that all batches of transferred waste are sufficiently uniform so that they all are equivalent to the characterized samples. However, the tank waste contains slurries of solid particles that settle and may become progressively more concentrated towards the bottom of the tank. Obtaining a perfectly uniform distribution of waste in the DSTs with a mixing system may not be possible. To determine how close this ideal can be approached, the expected performance of the DST mixing and sampling systems must be quantified. There have been a number of laboratory studies and full-scale tank farm studies that evaluated mixing behavior; these studies are discussed later in this report. However, these studies do not provide adequate quantitative information to evaluate the performance of the planned sampling and the batch uniformity. Accordingly, WRPS' demonstration program is focusing specifically on quantifying the uniformity of samples and batch transferred material to reduce the technical risk associated with these systems.The first phase of the demonstration program is to conduct scaled tests that appropriately match fullscale behavior and to evaluate sampling methodologies and the uniformity of batch transfers. The initial scaled testing will use non-cohesive particles where the particles do not have cohesive interactions that would cause the particles to stick together. The purpose of this report is to analyze existing data and evaluate whether scaled mixing tests with cohesive simulants are needed to meet the overall objectives of the small-scale mixing demonstration program. This evaluation will focus on estimating the role of cohesive particle interactions on various physical phenomena that occur in parts of the mixing process. A specific focus of the evaluation will be on the uniformity of suspended solids in the mixed region.The evaluation shows that cohesive particle interaction will have multiple effects through a number of different mechanisms. Some of the effects ...

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“…In addition, the model contains terms for two-parameter interaction effects that were considered by Greer (2012) . Also, because the effect of CV was expected to be small based on previous testing (Adamson et al 2009; Lee 2012), CV was not expected to have a large interaction effect with any of the other parameters. Hence, no interaction effects with CV are included in the model in Equation (5.1).…”

mentioning

confidence: 97%

Scaling Relationships Based on Scaled Tank Mixing and Transfer Test Results

Piepel

Holmes

Heredia-Langner

et al. 2014

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Executive SummaryWashington River Protection Solutions (WRPS), as the Hanford Site tank farms contractor, will be responsible for transferring waste from a double-shell tank (DST) to the Waste Treatment and Immobilization Plant (WTP) when the WTP begins operations. The WRPS approach for predicting mixing and transfer performance (MTP) for a DST involves three primary steps:1. Conduct tests consisting of variations in several parameters in two scaled tanks in the Small Scale Mixing Demonstration (SSMD) platform to generate data on MTP.2. Develop scaling relationships for MTP as a function of the test parameters using the test data from Step 1. Use the scaling relationships fromStep 2 that are valid for the two test scales, as well as other knowledge and methods for mixing and transfer, to develop scaling relationships applicable to full-scale DST performance.Step 1 has been completed by WRPS, which involved generating data for 26 test combinations performed in both of the two scaled tanks of the SSMD platform (for a total of 52 tests). The two tanks had diameters of 43.2 (referred to as 43 subsequently) and 120 inches, which are 1:21 and 1:8 relative to a full-scale DST, respectively. Other parameters that were varied in testing included mixer-jet nozzle velocity (U), base simulant (BS), supernatant viscosity (SV), (a) and transfer-line capture velocity (CV). The first 22 of the 26 test combinations conducted in both size tanks were selected using a statistical experimental design approach. An additional 4 test combinations performed at both scales used parameter combinations that are most relevant to expected operating conditions, and had not been tested previously. For each of the 52 tests, samples were collected pre-transfer and for each of five batch transfers. The samples were prepared and analyzed, with the results being the concentrations (lb/gal slurry) of the four solids components (gibbsite, stainless steel, sand, and ZrO 2 ) in the base simulant.Step 2 consists of building mathematical models for each of the two scale tanks that describe the MTP as a function of the test parameters. These models can then be used to calculate mixer-jet nozzle velocities where performance is equal between tank scales. These points of equal performance can be used to derive scaling relationships, which will allow estimating performance for full-scale DSTs. This report documents the statistical analyses associated with Step 2, which were performed by Pacific Northwest National Laboratory (PNNL) on data from the 52 tests conducted. Preliminary efforts focused on trying to model MTP metrics consisting of differences or ratios of BS-component concentrations for the five batch transfers relative to pre-transfer. However, depending on the solids component, there was little difference in component concentrations in batch transfers compared to pre-transfer for many to most of the tests. Hence, such differences and ratios of component concentrations were not useful MTP metrics because the effects of the test parameters "canceled ...

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Demonstration of Simulated Waste Transfers From Tank Ay-102 to the Hanford Waste Treatment Facility

Cited by 4 publications

References 0 publications

Demonstration of Mixing and Transferring Settling Cohesive Slurry Simulants in the Ay-102 Tank

Demonstration of Mixing and Transferring Settling Cohesive Slurry Simulants in the Ay-102 Tank

The Role of Cohesive Particle Interactions on Solids Uniformity and Mobilization During Jet Mixing: Testing Recommendations

Scaling Relationships Based on Scaled Tank Mixing and Transfer Test Results

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