DWPF Melter Off-Gas Flammability Assessment for Sludge Batch 9

Technical Report · Mon Jul 11 04:00:00 EDT 2016

DOI:https://doi.org/10.2172/1262322· OSTI ID:1262322

Choi, A. S. ^[1]

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1. Savannah River Site (SRS), Aiken, SC (United States)

The slurry feed to the Defense Waste Processing Facility (DWPF) melter contains several organic carbon species that decompose in the cold cap and produce flammable gases that could accumulate in the off-gas system and create potential flammability hazard. To mitigate such a hazard, DWPF has implemented a strategy to impose the Technical Safety Requirement (TSR) limits on all key operating variables affecting off-gas flammability and operate the melter within those limits using both hardwired/software interlocks and administrative controls. The operating variables that are currently being controlled include; (1) total organic carbon (TOC), (2) air purges for combustion and dilution, (3) melter vapor space temperature, and (4) feed rate. The safety basis limits for these operating variables are determined using two computer models, 4-stage cold cap and Melter Off-Gas (MOG) dynamics models, under the baseline upset scenario - a surge in off-gas flow due to the inherent cold cap instabilities in the slurry-fed melter.

• Research Organization: Savannah River Site (SRS), Aiken, SC (United States)
• Sponsoring Organization: USDOE Office of Environmental Management (EM)
• DOE Contract Number: AC09-08SR22470
• OSTI ID: 1262322
• Report Number(s): SRNL-STI--2016-00318
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CERAMIC MELTERS
COMBUSTION
COMPUTERIZED SIMULATION
DILUTION
DWPF
EVALUATION
FLAMMABILITY
GAS FLOW
HAZARDS
INSTABILITY
INTERLOCKS
MITIGATION
OFF-GAS SYSTEMS
SB9
SLUDGES
SLURRIES
SURGES
VAPORS
WASTE PROCESSING
melter off-gas flammability