Impact of Antifoam Agent Addition on Hydrogen Formation in the Hanford Waste Treatment and Immobilization Plant

Sherwood, David J.; Crawford, Charles L.; White, Thomas L.; Duffey, Cheryl; Calloway, T. Bond

doi:10.13182/nse08-a2741

Cited by 3 publications

(8 citation statements)

References 6 publications

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“…The HGR model used in WTP studies has been shown (Sherwood and Stock 2004) to provide a conservative margin for most tank wastes against which it has been tested, and additional margin is contributed by conservatism in many of the inputs used in safety studies. However, in-process conditions and postulated conditions during loss-of-power events can include higher temperatures, greater dilution, higher solids fractions, and/or higher hydroxide concentrations than were present in the tank waste samples used in HGR testing.…”

Section: Assess Margin In Hydrogen Generation Rate Estimatesmentioning

confidence: 99%

“… Assessment of the margin in the WTP HGR correlation (Sherwood and Stock 2004). The status of this subtask is detailed below in terms of the following individual activities:…”

Section: Technical Approach and Progressmentioning

confidence: 99%

“…Three different release-gas compositions were considered: pure H 2 , the composition measured in SY-101 mixed slurry at riser 23A by retained gas sampling , and the gas produced during HGR testing of self-irradiated oxygenated AN-106 liquid at 90°C (Sherwood and Stock 2004). The gases were chosen to include a range of density and flammability that would answer the question of whether higher flammability and lower density (faster dispersion of the plume) produced a greater risk than lower flammability and higher density (slower dispersion of the plume).…”

Section: Release-gas Propertiesmentioning

confidence: 99%

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Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Gauglitz

Bontha

Daniel

et al. 2015

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 What is an appropriate mixing metric/requirement that corresponds to adequate gas release and can this requirement be used as an alternative to conducting gas release testing? Do the simulants used in previous gas release testing adequately represent actual waste at plant conditions and what is the most suitable simulant for any planned gas release testing? What is the quantity of hydrogen that could be retained and released during normal, abnormal, and post-design-basis event operations for a range of imperfect mixing conditions (i.e., how much margin is allowed in targeting complete bottom clearing and complete vessel motion)? What is the quantity of hydrogen that can be retained and released in low-solids vessels? What is the margin in the current hydrogen generation rate estimates?Specific test and analysis objectives were identified for each of these questions and subsequently documented in a test plan; however, no technical activities were completed under the test plan for addressing these technical questions. iv S.2 Results and Performance Against Success CriteriaSuccess criteria were developed for each testing and analysis objective and documented in the project test plan; however, no technical activities were completed on the objectives under the test plan. Accordingly, no results are available to compare against the success criteria.

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Section: Assess Margin In Hydrogen Generation Rate Estimatesmentioning

confidence: 99%

“… Assessment of the margin in the WTP HGR correlation (Sherwood and Stock 2004). The status of this subtask is detailed below in terms of the following individual activities:…”

Section: Technical Approach and Progressmentioning

confidence: 99%

Section: Release-gas Propertiesmentioning

confidence: 99%

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Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Gauglitz

Bontha

Daniel

et al. 2015

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“…The model was not adjusted for the impact of oxygen on HGR as the model was shown to be conservative for those conditions, although additional work was recommended [Hu, 2004]. The changes to the HGR model for use in the WTP have been documented [Sherwood and Stock, 2004]. Later reviews of the HGR method confirm the acceptability of the HGR model for use at WTP [Duncan, 2009].…”

Section: Review Of Applicability Of Hgr Models For Wtp Process Streamsmentioning

confidence: 99%

“…A comprehensive model of hydrogen generation has been developed from these studies to allow expected hydrogen generation rates to be determined for Hanford waste [Meacham, 2009 andSherwood, 2004].…”

Section: Appendix B: Reviewed Documents Excluded From Evaluationmentioning

confidence: 99%

Evaluation Of Methods To Measure Hydrogen Generation Rate In A Shielded Cell Environment And A Method Recommendation

Stone¹

2012

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Self-Flammability of Gases Generated by Hanford Tank Waste and the Potential of Nitrogen Inerting to Eliminate Flammability Safety Concerns

Mahoney

2015

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Revision History Revision Number Interim Change No. Effective Date Description of Change 0 0 6/2015 Initial issue. 1 0 10/2015 Text changes for clarification throughout the document. Added Figure 3.1 and related text. Revised Equation (5.3) and the calculations made with it. Added Table 5.1. Added information in Section 5 about the H 2 /N 2 O ratio that gives mixtures that are denser than N 2. Added Appendix A to show the derivation of Equations (5.2) and (5.3).

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Impact of Antifoam Agent Addition on Hydrogen Formation in the Hanford Waste Treatment and Immobilization Plant

Cited by 3 publications

References 6 publications

Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Hydrogen Gas Retention and Release from WTP Vessels: Summary of Preliminary Studies

Evaluation Of Methods To Measure Hydrogen Generation Rate In A Shielded Cell Environment And A Method Recommendation

Self-Flammability of Gases Generated by Hanford Tank Waste and the Potential of Nitrogen Inerting to Eliminate Flammability Safety Concerns

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