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Title: DWPF Melter Off-Gas Flammability Assessment for Sludge Batch 9

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.
Authors:
 [1]
  1. Savannah River Site (SRS), Aiken, SC (United States)
Publication Date:
OSTI Identifier:
1262322
Report Number(s):
SRNL-STI--2016-00318
TRN: US1601602
DOE Contract Number:
DE-AC09-08SR22470
Resource Type:
Technical Report
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE Office of Environmental Management (EM)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; VAPORS; FLAMMABILITY; MITIGATION; SLURRIES; WASTE PROCESSING; COMBUSTION; COMPUTERIZED SIMULATION; GAS FLOW; EVALUATION; HAZARDS; SLUDGES; OFF-GAS SYSTEMS; DILUTION; INSTABILITY; INTERLOCKS; SURGES; CERAMIC MELTERS DWPF; SB9; melter off-gas flammability