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Title: COMMERCIAL SNF ACCIDENT RELEASE FRACTIONS

Abstract

The purpose of this design analysis is to specify and document the total and respirable fractions for radioactive materials that are released from an accident event at the Monitored Geologic Repository (MGR) involving commercial spent nuclear fuel (CSNF) in a dry environment. The total and respirable release fractions will be used to support the preclosure licensing basis for the MGR. The total release fraction is defined as the fraction of total CSNF assembly inventory, typically expressed as an activity inventory (e.g., curies), of a given radionuclide that is released to the environment from a waste form. The radionuclides are released from the inside of breached fuel rods (or pins) and from the detachment of radioactive material (crud) from the outside surfaces of fuel rods and other components of fuel assemblies. The total release fraction accounts for several mechanisms that tend to retain, retard, or diminish the amount of radionuclides that are available for transport to dose receptors or otherwise can be shown to reduce exposure of receptors to radiological releases. The total release fraction includes a fraction of airborne material that is respirable and could result in inhalation doses. This subset of the total release fraction is referred to asmore » the respirable release fraction. Potential accidents may involve waste forms that are characterized as either bare (unconfined) fuel assemblies or confined fuel assemblies. The confined CSNF assemblies at the MGR are contained in shipping casks, canisters, or disposal containers (waste packages). In contrast to the bare fuel assemblies, the container that confines the fuel assemblies has the potential of providing an additional barrier for diminishing the total release fraction should the fuel rod cladding breach during an accident. However, this analysis will not take credit for this additional bamer and will establish only the total release fractions for bare unconfined CSNF assemblies, which may however be conservatively applied to confined CSNF assemblies.« less

Authors:
Publication Date:
Research Org.:
Office of Scientific and Technical Information, Oak Ridge, TN
Sponsoring Org.:
USDOE
OSTI Identifier:
862248
Report Number(s):
ANL-WHS-SE-000002 REV 00
MOL.20000124.0242 DC#21917; TRN: US0600701
DOE Contract Number:  
NA
Resource Type:
Technical Report
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; ACCIDENTS; CASKS; CONTAINERS; DESIGN; FUEL ASSEMBLIES; FUEL RODS; INHALATION; LICENSING; NUCLEAR FUELS; RADIOACTIVE MATERIALS; RADIOISOTOPES; TRANSPORT; WASTE FORMS; SPENT FUELS

Citation Formats

S.O. Bader. COMMERCIAL SNF ACCIDENT RELEASE FRACTIONS. United States: N. p., 1999. Web. doi:10.2172/862248.
S.O. Bader. COMMERCIAL SNF ACCIDENT RELEASE FRACTIONS. United States. doi:10.2172/862248.
S.O. Bader. Mon . "COMMERCIAL SNF ACCIDENT RELEASE FRACTIONS". United States. doi:10.2172/862248. https://www.osti.gov/servlets/purl/862248.
@article{osti_862248,
title = {COMMERCIAL SNF ACCIDENT RELEASE FRACTIONS},
author = {S.O. Bader},
abstractNote = {The purpose of this design analysis is to specify and document the total and respirable fractions for radioactive materials that are released from an accident event at the Monitored Geologic Repository (MGR) involving commercial spent nuclear fuel (CSNF) in a dry environment. The total and respirable release fractions will be used to support the preclosure licensing basis for the MGR. The total release fraction is defined as the fraction of total CSNF assembly inventory, typically expressed as an activity inventory (e.g., curies), of a given radionuclide that is released to the environment from a waste form. The radionuclides are released from the inside of breached fuel rods (or pins) and from the detachment of radioactive material (crud) from the outside surfaces of fuel rods and other components of fuel assemblies. The total release fraction accounts for several mechanisms that tend to retain, retard, or diminish the amount of radionuclides that are available for transport to dose receptors or otherwise can be shown to reduce exposure of receptors to radiological releases. The total release fraction includes a fraction of airborne material that is respirable and could result in inhalation doses. This subset of the total release fraction is referred to as the respirable release fraction. Potential accidents may involve waste forms that are characterized as either bare (unconfined) fuel assemblies or confined fuel assemblies. The confined CSNF assemblies at the MGR are contained in shipping casks, canisters, or disposal containers (waste packages). In contrast to the bare fuel assemblies, the container that confines the fuel assemblies has the potential of providing an additional barrier for diminishing the total release fraction should the fuel rod cladding breach during an accident. However, this analysis will not take credit for this additional bamer and will establish only the total release fractions for bare unconfined CSNF assemblies, which may however be conservatively applied to confined CSNF assemblies.},
doi = {10.2172/862248},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 18 00:00:00 EDT 1999},
month = {Mon Oct 18 00:00:00 EDT 1999}
}

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