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Title: Evaluation of the Potential for Tank 241-C-106 to Achieve a Flammable Atmosphere

Abstract

It is planned to have the remaining waste in 241-C-106 removed from the tank so that it can be closed. Since the tank is nearly empty, it has little potential to generate or store flammable gas. This document evaluates the potential to achieve a flammable atmosphere in the tank. Neither steady state nor gas release event conditions can render the tank C-106 headspace flammable.

Authors:
Publication Date:
Research Org.:
CH2M (US)
Sponsoring Org.:
ENVIRONMENTAL MANAGEMENT (US)
OSTI Identifier:
808405
Report Number(s):
RPP-13547, Rev.0
TRN: US0302226
DOE Contract Number:
AC27-99RL14047
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 20 Nov 2002
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; FLAMMABILITY; GASES; STORAGE FACILITIES; RADIOACTIVE WASTE STORAGE; RISK ASSESSMENT; FIRE HAZARDS

Citation Formats

BARTON, W.B. Evaluation of the Potential for Tank 241-C-106 to Achieve a Flammable Atmosphere. United States: N. p., 2002. Web. doi:10.2172/808405.
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BARTON, W.B. Evaluation of the Potential for Tank 241-C-106 to Achieve a Flammable Atmosphere. United States. doi:10.2172/808405.
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BARTON, W.B. Wed . "Evaluation of the Potential for Tank 241-C-106 to Achieve a Flammable Atmosphere". United States. doi:10.2172/808405. https://www.osti.gov/servlets/purl/808405.
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@article{osti_808405,
title = {Evaluation of the Potential for Tank 241-C-106 to Achieve a Flammable Atmosphere},
author = {BARTON, W.B.},
abstractNote = {It is planned to have the remaining waste in 241-C-106 removed from the tank so that it can be closed. Since the tank is nearly empty, it has little potential to generate or store flammable gas. This document evaluates the potential to achieve a flammable atmosphere in the tank. Neither steady state nor gas release event conditions can render the tank C-106 headspace flammable.},
doi = {10.2172/808405},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 20 00:00:00 EST 2002},
month = {Wed Nov 20 00:00:00 EST 2002}
}
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DOI:  10.2172/808405
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  • Prior to the sluicing of Tank 241-C-106, the 296-P-16 ventilation system will be shutdown and the 296-C-006 ventilation system operation will be initiated. The 296-C-006 system has a low once through flow with an additional recirculation flow in the tank dome space. A minimum dome pressure of -3 in W.G. is necessary for safe operation. An evaluation of the system has been performed. The results of the study show that adequate dome space vacuum can be achieved if the pump pits in Tank 241-C-106 are sealed.

  • ;
    This document is a preliminary assessment of the potential for a ``steam bump`` in Tank 241-C-106. The assessment is based on currently available data from significant transients which occurred in Tank C-106. Recommendations are made for additional data needs to clarify the current behavior of this tank. General criteria are provided for making decisions on removing or returning to work restrictions on Tank Farm operations. Also provided are additional actions which should be taken on C-106 to manage tank heat removal.

  • This calculation note analyzes headspace concentrations of hydrogen dependent upon assumed ventilation flow rates provided for tanks 241-C-106 and 241-AY-102. The analyses are based on measured or estimated steady state hydrogen release rates. Tank 241-C-106 is analyzed prior to sluicing; tank 241-AY-102 is analyzed both prior to and after completion of sluicing. Specific analyses, using both best estimated and bounding hydrogen generation rates, include the minimum primary ventilation flow rates required in the tanks to ensure that the steady state hydrogen concentration in the respective tank headspace does not exceed 25% and 100% of the LFL. The headspace hydrogen concentrationmore » as a function of time as well as the time required to reach 25% and 100% of LFL upon complete loss of active ventilation, starting from the steady state hydrogen concentration based on a 200 CFM minimum flow rate in tank 241-C-106 and a 100 CFM minimum flow rate in tank241-AY-102. The headspace hydrogen concentration as a function of thee following partial loss of active ventilation (i.e., step changes to l60, l20, 80, and 40 CFM ventilation flow rates) in tank 241-C-106, staffing from a 200 CFM flow rate and the corresponding steady state hydrogen concentration based on the 200 CFM flow rate. The headspace hydrogen concentration as a function of the following partial loss of active ventilation i.e., step changes to 80, 60, 40, and 20 CFM ventilation flow rates) in tank 241-AY-102, starting from a 100 CFM flow rate and the corresponding steady state hydrogen concentration based on the 100 CFM flow rate.« less

  • This document provides an evaluation of the criticality safety of oxalic acid dissolution to remove residual waste from Tank 241-C-106 and transfer to Tank 241-AN-106. Limits and controls for the activity are provided.

  • In preparation for the retrieval and transfer of the tank 241-C-106 sludge to double-shell tank storage, concentrated caustic (sodium hydroxide) needs to be added to the receiver, tank 241-AN-106, to ensure compliance with the AC 5.15, ''Corrosion Mitigation Program,'' chemistry control limits. The tank 241-C-106 sludge will be retrieved by dissolving the sludge using oxalic acid. The hydroxide content of AN-106 needs to be sufficient to neutralize the incoming acid waste stream.