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Title: Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105

Abstract

The primary purpose of this report is to identify and resolve some of the flammable gas and thermal safety issues potentially associated with the retrieval of waste from Tank 241-AN-105 (AN-105), which is the first double-shell tank scheduled for waste retrieval at Hanford. The planned retrieval scenario includes the following steps in AN-105: (1) degas the tank using two submerged mixing pumps, (2) turn off the mixer pump(s) and allow any suspended solids to settle, (3) decant the supernatant to the intermediate feed staging tank(s) (IFSTs) (AP-102 and/or AP-104) using water/caustic dilution at the transfer pump inlet, (4) add the remaining dilution water/caustic to the slurry remaining in AN-105, (5) mix the tank with the mixer pump(s) until the soluble solids dissolve, (6) turn off the mixer pump(s) and let the insoluble solids settle, and (7) decant the new supernatant to the IFST(s), leaving the insoluble solids behind. Three waste retrieval safety issues are addressed in this report. They are (1) the controlled degassing of AN-105 to ensure that the headspace remains <25% of the lower flammability limit (LFL), (2) an assessment of how dissolved gas (mainly ammonia) released during the transfer of the supernatant in AN-105 to the IFSTsmore » and the water/caustic dilution of the remaining slurry in AN-105 will affect the flammability in these tanks; and (3) an assessment of the maximum waste temperatures that might occur in AN-105 during retrieval operations.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab., Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)
OSTI Identifier:
665987
Report Number(s):
PNNL-11996
R&D Project: 28167; ON: DE98059303; BR: 820201000; TRN: 99:000794
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Sep 1998
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; HANFORD RESERVATION; RADIOACTIVE WASTE STORAGE; TANKS; FLAMMABILITY; WASTE RETRIEVAL; REMEDIAL ACTION; DEGASSING; AMMONIA; SAFETY ANALYSIS

Citation Formats

Caley, S M, Stewart, C W, Antoniak, Z I, Cuta, J M, Mahoney, L A, and Panisko, F E. Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105. United States: N. p., 1998. Web. doi:10.2172/665987.
Caley, S M, Stewart, C W, Antoniak, Z I, Cuta, J M, Mahoney, L A, & Panisko, F E. Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105. United States. doi:10.2172/665987.
Caley, S M, Stewart, C W, Antoniak, Z I, Cuta, J M, Mahoney, L A, and Panisko, F E. Tue . "Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105". United States. doi:10.2172/665987. https://www.osti.gov/servlets/purl/665987.
@article{osti_665987,
title = {Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105},
author = {Caley, S M and Stewart, C W and Antoniak, Z I and Cuta, J M and Mahoney, L A and Panisko, F E},
abstractNote = {The primary purpose of this report is to identify and resolve some of the flammable gas and thermal safety issues potentially associated with the retrieval of waste from Tank 241-AN-105 (AN-105), which is the first double-shell tank scheduled for waste retrieval at Hanford. The planned retrieval scenario includes the following steps in AN-105: (1) degas the tank using two submerged mixing pumps, (2) turn off the mixer pump(s) and allow any suspended solids to settle, (3) decant the supernatant to the intermediate feed staging tank(s) (IFSTs) (AP-102 and/or AP-104) using water/caustic dilution at the transfer pump inlet, (4) add the remaining dilution water/caustic to the slurry remaining in AN-105, (5) mix the tank with the mixer pump(s) until the soluble solids dissolve, (6) turn off the mixer pump(s) and let the insoluble solids settle, and (7) decant the new supernatant to the IFST(s), leaving the insoluble solids behind. Three waste retrieval safety issues are addressed in this report. They are (1) the controlled degassing of AN-105 to ensure that the headspace remains <25% of the lower flammability limit (LFL), (2) an assessment of how dissolved gas (mainly ammonia) released during the transfer of the supernatant in AN-105 to the IFSTs and the water/caustic dilution of the remaining slurry in AN-105 will affect the flammability in these tanks; and (3) an assessment of the maximum waste temperatures that might occur in AN-105 during retrieval operations.},
doi = {10.2172/665987},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}