Dissolution flowsheet for high flux isotope reactor fuel at SRS

Daniel, William E.; Rudisill, Tracy S.; O'Rourke, Patrick; Karay, Nicholas S.

doi:10.1080/01496395.2018.1559861

Cited by 2 publications

(5 citation statements)

References 8 publications

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“…Raman spectroscopy was chosen as a monitoring method due to its sensitivity to these species. It has been used for a similar purpose for laboratory flowsheet dissolution studies [2][3][4]. With respect to use in the processing facility, Raman spectroscopy's compatibility with optical fibers permits a more advantageous location for the instrument and reduces potential worker exposure to hazardous conditions.…”

Section: Use Of Raman Spectroscopy For Dissolution Monitoringmentioning

confidence: 99%

“…This spectrum in shown in Figure S1 in the Supplementary Materials. In contrast, all of these species were observed during laboratory dissolution studies, where the gases were measured immediately after emerging from the reaction vessel [2][3][4]. As the gas sampling system is not expected to alter the composition of the stream, the possibility of additional chemistry occurring in the H-Canyon offgas system should be considered.…”

Section: Instrument Performancementioning

confidence: 99%

“…Ideally, the readings of the Raman offgas monitor, alone or in combination with other process operating data, could be interpreted to give a measure of the mass of fuel that has been dissolved. If the gas sampling point was located in the dissolver headspace, this calculation could hypothetically be performed via a quantitation of the nitrogen-containing products in Equations ( 1) and (2). Percent values of these gases could be converted into absolute values via the application of the air sparge and purge rates, assuming that the system is leak-free.…”

Section: Materials Balance Considerationsmentioning

confidence: 99%

“…The Savannah River Site (SRS) H-Canyon processing facility is used to dissolve spent nuclear fuels (SNF) and other nuclear materials as the first step in nuclear waste disposition pathways [1][2][3]. While the fuels that are dissolved have a variety of properties (cladding material, aspect ratios, and shapes), the general dissolution process is the same for all of them.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

“…As determined from fitting data to Equation (6) to estimate a and b. Uncertainties are propagated from the %NO 2 values 2. Reported as "not detected" by the facility.…”

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confidence: 99%

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Development of a Nuclear Fuel Dissolution Monitor Based on Raman Spectroscopy

Lascola,

O'Rourke,

Immel

2024

Sensors

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The processing of spent nuclear fuel and other nuclear materials is a critical component of nuclear material management with implications for global security. The first step of fuel processing is dissolution, with several charges of fuel sequentially added to a batch of solvent. The incomplete dissolution of a charge precludes the addition of the next charge. As the dissolution takes place in a heated, highly corrosive and radiological vessel, direct monitoring of the process is not possible. We discuss the use of Raman spectroscopy to indirectly monitor dissolution through an analysis of the gaseous emissions from the dissolver. Challenges associated with the implementation of Raman spectroscopy include the composition and physical characteristics of the offgas stream and the impact of operating conditions. Nonetheless, we observed that NO2 concentrations serve as a reliable indicator of process activity and correlate to the amount of fuel material that remains undissolved. These results demonstrate the promise of the method for monitoring nuclear material dissolution.

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Section: Use Of Raman Spectroscopy For Dissolution Monitoringmentioning

confidence: 99%

Section: Instrument Performancementioning

confidence: 99%

Section: Materials Balance Considerationsmentioning

confidence: 99%

Section: Introduction 1backgroundmentioning

confidence: 99%

“…As determined from fitting data to Equation (6) to estimate a and b. Uncertainties are propagated from the %NO 2 values 2. Reported as "not detected" by the facility.…”

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confidence: 99%

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