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Title: On The Impact of Borescope Camera Air Purge on DWPF Melter Off-Gas Flammability

Abstract

DWPF Engineering personnel requested that a new minimum backup film cooler air flow rate, which will meet the off-gas safety basis limits for both normal and seismic sludge-only operations, be calculated when the air purge to the borescope cameras is isolated from the melter. Specifically, it was requested that the latest calculations which were used to set the off-gas flammability safety bases for the sludge batch 2 and 3 feeds be revised, while maintaining all other process variables affecting off-gas flammability such as total organic carbon (TOC), feed rate, melter air purges, and vapor space temperature at their current respective maximum or minimum limits. Before attempting to calculate the new minimum backup film cooler air flow, some of the key elements of the combustion model were reviewed, and it was determined that the current minimum backup film cooler air flow of 233 lb/hr is adequate to satisfy the off-gas flammability safety bases for both normal and seismic operations i n the absence of any borescope camera air purge. It is, therefore, concluded that there is no need to revise the reference E-7 calculations. This conclusion is in essence based on the fact that the current minimum backup film cooler airmore » flow was set to satisfy the minimum combustion air requirement under the worst-case operating scenario involving a design basis earthquake during which all the air purges not only to the borescope cameras but to the seal pot are presumed to be lost due to pipe ruptures. The minimum combustion air purge is currently set at 150 per cent of the stoichiometric air flow required to combust 3 times the normal flow of flammable gases. The DWPF control strategy has been that 100 per cent of the required minimum combustion air is to be provided by the controlled air purge through the backup film cooler alone.« less

Authors:
Publication Date:
Research Org.:
Savannah River Site (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
827206
Report Number(s):
WSRC-TR-2004-00008
TRN: US0406939
DOE Contract Number:  
AC09-96SR18500
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 22 Jul 2004; PBD: 22 Jul 2004
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; AIR FLOW; BORESCOPES; CAMERAS; CARBON; COMBUSTION; DESIGN; EARTHQUAKES; ENGINEERS; FLAMMABILITY; GASES; HEAT EXCHANGERS; RUPTURES; SLUDGES; CERAMIC MELTERS; OFF-GAS SYSTEMS; SAFETY ENGINEERING; RADIOACTIVE WASTE PROCESSING

Citation Formats

CHOI, ALEXANDER. On The Impact of Borescope Camera Air Purge on DWPF Melter Off-Gas Flammability. United States: N. p., 2004. Web. doi:10.2172/827206.
CHOI, ALEXANDER. On The Impact of Borescope Camera Air Purge on DWPF Melter Off-Gas Flammability. United States. doi:10.2172/827206.
CHOI, ALEXANDER. Thu . "On The Impact of Borescope Camera Air Purge on DWPF Melter Off-Gas Flammability". United States. doi:10.2172/827206. https://www.osti.gov/servlets/purl/827206.
@article{osti_827206,
title = {On The Impact of Borescope Camera Air Purge on DWPF Melter Off-Gas Flammability},
author = {CHOI, ALEXANDER},
abstractNote = {DWPF Engineering personnel requested that a new minimum backup film cooler air flow rate, which will meet the off-gas safety basis limits for both normal and seismic sludge-only operations, be calculated when the air purge to the borescope cameras is isolated from the melter. Specifically, it was requested that the latest calculations which were used to set the off-gas flammability safety bases for the sludge batch 2 and 3 feeds be revised, while maintaining all other process variables affecting off-gas flammability such as total organic carbon (TOC), feed rate, melter air purges, and vapor space temperature at their current respective maximum or minimum limits. Before attempting to calculate the new minimum backup film cooler air flow, some of the key elements of the combustion model were reviewed, and it was determined that the current minimum backup film cooler air flow of 233 lb/hr is adequate to satisfy the off-gas flammability safety bases for both normal and seismic operations i n the absence of any borescope camera air purge. It is, therefore, concluded that there is no need to revise the reference E-7 calculations. This conclusion is in essence based on the fact that the current minimum backup film cooler air flow was set to satisfy the minimum combustion air requirement under the worst-case operating scenario involving a design basis earthquake during which all the air purges not only to the borescope cameras but to the seal pot are presumed to be lost due to pipe ruptures. The minimum combustion air purge is currently set at 150 per cent of the stoichiometric air flow required to combust 3 times the normal flow of flammable gases. The DWPF control strategy has been that 100 per cent of the required minimum combustion air is to be provided by the controlled air purge through the backup film cooler alone.},
doi = {10.2172/827206},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {7}
}

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