In situ determination of rheological properties and void fraction: Hanford Waste Tank 241-SY-103

Shepard, C.L.; Stewart, Charles W.; Alzheimer, J.M.; Terrones, Guillermo; Chen, G.; Wilkins, N.E.

doi:10.2172/176709

Cited by 6 publications

(9 citation statements)

References 3 publications

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“…The character of GREs in AN-105 shares some of the features of both SY-103 (Shepard et al 1995) and AW-101. The initial level drop is quite rapid, aS is the gas release, although the total level drop typically requires several days.…”

Section: Gas Releasementioning

confidence: 85%

“…Although the releases were rather dramatic in appearance, analysis shows that only a very small amount of gas was actually released during these measurements, and this could not have significantly affected the void fraction measurement (Shepard et al 1995). Most of.the surface disturbance arose from opening the sample chamber and dumping the pressurized nitrogen from the prior test.…”

Section: 1 Sy-103 Instrumentationmentioning

confidence: 95%

“…They have performed as designed in all tests and had no significant problems. The initial testing program in SY-101 and SY-103 is documented in Stewart et al (1995), Brewster et al (1995), and Shepard et al (1995).…”

Section: Description Of the Ball Rheometer And Vfimentioning

confidence: 99%

“…Acceptance testing of the ball rheometer in the WHC 306E facility concluded successfully in August 1994. It was bolted to riser 4A in SY-101 later in the month and was first operated in September 1994, although problems with the water lance delayed actual testing in waste until March 1995. 1.4 The test plan for deploying the ball rheometer ii.1 the various tanks was incrementally modified and refined after measurements in SY-101 and SY-103 were completed and the reduced data were analyzed Shepard et al 1995). The ball speed range was increased to provide a measurable force in the liquid.…”

mentioning

confidence: 99%

“…W e n multistep velocity measurements are not used in a thixotropic nonconvective layer, an integrated measure of the apparent viscosity can be calculated over the range of experimental strain rate measures. This average apparent viscosity was used in the characterization of the waste in Tank 241-SY-103 (Shepard et al 1995) This bound is inferred from the drag measurements for the region where the ball can traverse freely. If we were to calculate the "precise" yield stress we would obtain a smaller value than that of Equation (3.1.26).…”

mentioning

confidence: 99%

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In situ rheology and gas volume in Hanford double-shell waste tanks

Stewart¹,

Alzheimer²,

Brewster³

et al. 1996

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Section: Gas Releasementioning

confidence: 85%

Section: 1 Sy-103 Instrumentationmentioning

confidence: 95%

Section: Description Of the Ball Rheometer And Vfimentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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In situ rheology and gas volume in Hanford double-shell waste tanks

Stewart¹,

Alzheimer²,

Brewster³

et al. 1996

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Tank characterization report for double-shell tank 241-SY-103

Conner¹

1996

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Flammable gas project topical report

Johnson¹

1997

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The flammable gas safety issue was recognized in 1990 with the declaration of an unreviewed safety question (USQ) by the U. S. Department of Energy as a result of the behavior of the Hanford Site high-level waste tank 241-SY-101. This tank exhibited episodic releases of flammable gas that on a couple of occasions exceeded the lower flammability limit of hydrogen in air.Over the past six years there has been a considerable amount of knowledge gained about the chemical and physical processes that govern the behavior of tank 241-SY-101 and other tanks associated with the flammable gas safety issue. This report was prepared to provide an overview of that knowledge and to provide a description of the key information still needed to resolve the issue.Items covered by this report include summaries of the understanding of gas generation, retention and release mechanisms, the composition and flammability behavior of the gas mixture, the amounts of stored gas, and estimated gas release fractions for spontaneous releases. The report also discusses methods being developed for evaluating the 177 tanks at the Hanford Site and the problems associated with these methods.Means for measuring the gases emitted from the waste are described along with laboratory experiments designed to gain more information regarding rates of generation, species of gases emitted and modes of gas storage and release. Finally, the process for closing the USQ is outlined as are the information requirements to understand and resolve the flammable gas issue. The flammable gas hazard will continue to exist until the wastes are retrieved fiom the tanks. However, DOE plans to resolve the Flammable Gas Safety Issue on a tank-by-tank basis when the following steps are completed: a) determination of the amount and composition of gas retained in the wastes; b) establishment of an adequate understanding of the mechanisms for gas generation, retention and release; and c) updating the Authorization Basis for the Manage Tank Waste Function.The major emphasis of this report is to put the flammable gas hazard into perspective based on our current understanding of the mechanisms driving generation, retention and release of flammable gas mixtures in high-level waste tanks. It provides an overview of what has been learned and what needs to be learned about the phenomena, how the Unreviewed Safety Question will be closed, and the strategy for closing the flammable gas safety issue itself. Section 1 of this report provides an overview of the understanding and needs of the Flammable Gas Safety Issue and Sections 2-7 provide additional details to the information provided in Section 1.The information in this report represents the status of what is known or being done as of the latter part of 1996. As additional information is obtained fiom the characterization of tanks, analyses of data, and development of models and analysis methods, the information in this report will need to be updated.

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In situ determination of rheological properties and void fraction: Hanford Waste Tank 241-SY-103

Abstract: PIZiTRiBUTlON OF THIS DOCUMENT 1S UNLIMI?ED Portions of this document mag be illegible in electronic image pmdnds. Images are produced h m the b s t available original document.

Cited by 6 publications

References 3 publications

In situ rheology and gas volume in Hanford double-shell waste tanks

In situ rheology and gas volume in Hanford double-shell waste tanks

Tank characterization report for double-shell tank 241-SY-103

Flammable gas project topical report

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