Acronyms and Abbreviations BDGRE buoyant displacement gas release event DSA Documented Safety Analysis DSGRE deep sludge gas release event DST double-shell tank GRE gas release event LFL lower flammability limit PNNL Pacific Northwest National Laboratory SST single-shell tank UDS undissolved solids WFD waste feed delivery WTP Hanford Tank Waste Treatment and Immobilization Plant
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