Small Scale Melter Testing of LAW Salt Phase Separation (Final Report, Rev. 0)

Matlack, Keith S.; Muller, Isabelle S.; Gong, Weiliang; Pegg, Ian L.

doi:10.2172/1514890

Cited by 10 publications

(22 citation statements)

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“…The cesium data suggest, despite the noise in the data, that cesium is more volatile at the higher alkali concentrations in Tests 2 and 3, in agreement with previous observations [53]. Also supporting previous observations of volatility is the near 50% loss of chlorine from the glass at target concentrations greater than 0.3 weight percent [24,52]. Another previously documented volatility trend [5,6,9,10,24,52] implied by the data is the higher degree of sulfur retention in compositions with higher glass sodium concentrations (see Figure 3.3).…”

Section: Compositional Analysissupporting

confidence: 90%

“…During the initial test series with Region E (AZ-101) feeds, it was discerned from preliminary XRF measurements of product glass that the chromium concentration far exceeded the target concentration due to leaching of chromium from melter bricks and Inconel components. Recent melter test with LAW simulants have shown that high chromium concentration facilitate the formation of secondary sulfate phases that would not form otherwise [52]. In response to this, the chromium concentration in the feed was reduced after the second test segment (1B) to compensate for the expected chromium input from corrosion.…”

Section: Dm10 Test Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Final Report - Enhanced LAW Glass Formulation Testing, VSL-07R1130-1, Rev. 0, dated 10/05/07

Kruger¹,

Pegg²,

Matlack³

et al. 2013

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Section: Compositional Analysissupporting

confidence: 90%

Section: Dm10 Test Resultsmentioning

confidence: 99%

Final Report - Enhanced LAW Glass Formulation Testing, VSL-07R1130-1, Rev. 0, dated 10/05/07

Kruger¹,

Pegg²,

Matlack³

et al. 2013

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“…These values estimated for 1150°C are in reasonable agreement with the value measured by VSL (4.4 Pa s). 36…”

Section: Resultsmentioning

confidence: 99%

Effect of sucrose on foaming and melting behavior of a low‐activity waste melter feed

et al. 2019

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Reductants, such as sucrose (C12H22O11), are added to nuclear waste melter feeds containing high fractions of nitrates and nitrites to reduce excessive foaming during feed‐to‐glass conversion, decrease sulfate segregation, and increase technetium retention. The effect of sucrose on foaming and melting reactions during the conversion was examined using the feed volume expansion test, thermogravimetric analysis, evolved gas analysis, x‐ray diffraction, and scanning electron microscopy with energy dispersive x‐ray spectrometry. Different amounts of sucrose were added to vary the carbon to nitrogen (C/N) ratio in the melter feed. As the C/N ratio increased, the extent of foaming decreased, and the N2/NO ratio increased in the evolved gas. Significant foam suppression, rapid gas release at approximately 250°C, and reduction in transition metal oxides were observed at C/N > 1.1.

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“…The compositions of the eleven glasses investigated, shown in Table 1, were based on those developed and tested previously for treatment of Hanford WTP LAW streams [24,25]. The glasses were determined to be amorphous by XRD, except for NaI-2 and NaI-6, which appear to have trace amounts (<0.1 wt.%) of spinel crystals.…”

Section: Methodsmentioning

confidence: 99%

Iodine valence and local environments in borosilicate waste glasses using X-ray absorption spectroscopy

McKeown

Muller

Pegg

2015

Journal of Nuclear Materials

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a b s t r a c tThe radioisotope 129 I, a fission product in spent nuclear fuel, has a long half-life, and can be highly mobile in the environment. Iodine K-edge X-ray absorption spectra were collected to characterize the iodine valence and coordination environment in simulated Hanford low activity waste glasses. Both iodine XANES and EXAFS data for eleven borosilicate glasses indicate iodide-like environments within the glass structure, where I À has Na or Li nearest-neighbors, and where the nearest-neighbor cation-type correlates to the most common network-modifying cation in the glass. This is further supported by the systematic increase of iodine incorporation with the combined Na 2 O + Li 2 O content in the glass. EXAFS analyses determined I-Na distances near 3.04 Å with coordination numbers near 4.0 and I-Li distances near 2.80 Å with coordination numbers near 3.0. I-Na environments determined for the glasses are similar to the tetrahedral INa 4 coordination found in NaI-sodalite. These weakly bound iodine-alkali configurations may be the only pathways for iodine to be retained in the glass. These environments may be precursors to NaI-sodalite crystallization in Na-rich glass. Iodine also shows distinct differences from chlorine in terms of the preferred sites in the glass structure.

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Small Scale Melter Testing of LAW Salt Phase Separation (Final Report, Rev. 0)

Cited by 10 publications

References 0 publications

Final Report - Enhanced LAW Glass Formulation Testing, VSL-07R1130-1, Rev. 0, dated 10/05/07

Final Report - Enhanced LAW Glass Formulation Testing, VSL-07R1130-1, Rev. 0, dated 10/05/07

Effect of sucrose on foaming and melting behavior of a low‐activity waste melter feed

Iodine valence and local environments in borosilicate waste glasses using X-ray absorption spectroscopy

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