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Title: ENSURING CONSERVATISM/LESSONS LEARNED IN LEAK PATH FACTOR CALCULATIONS WITH MELCOR

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1321694
Report Number(s):
LA-UR-07-2386
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: ENERGY FACILITIES CONTRACTORS GROUP, SAFETY ANALYSIS WORKING GROUP ; 200705 ; IDAHO FALLS
Country of Publication:
United States
Language:
English

Citation Formats

SIEBE, DONALD A., MCCLURE, PATRICK R., and LETELLIER, BRUCE C.. ENSURING CONSERVATISM/LESSONS LEARNED IN LEAK PATH FACTOR CALCULATIONS WITH MELCOR. United States: N. p., 2007. Web.
SIEBE, DONALD A., MCCLURE, PATRICK R., & LETELLIER, BRUCE C.. ENSURING CONSERVATISM/LESSONS LEARNED IN LEAK PATH FACTOR CALCULATIONS WITH MELCOR. United States.
SIEBE, DONALD A., MCCLURE, PATRICK R., and LETELLIER, BRUCE C.. Wed . "ENSURING CONSERVATISM/LESSONS LEARNED IN LEAK PATH FACTOR CALCULATIONS WITH MELCOR". United States. doi:. https://www.osti.gov/servlets/purl/1321694.
@article{osti_1321694,
title = {ENSURING CONSERVATISM/LESSONS LEARNED IN LEAK PATH FACTOR CALCULATIONS WITH MELCOR},
author = {SIEBE, DONALD A. and MCCLURE, PATRICK R. and LETELLIER, BRUCE C.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 11 00:00:00 EDT 2007},
month = {Wed Apr 11 00:00:00 EDT 2007}
}

Conference:
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  • This paper presents a Leak Path Factor (LPF) analysis for a postulated fire accident on a building containing plutonium powder when the resulting outside release is partly through the ventilation/filtration system and partly through other pathways such as building access doorways. When analyzing an accident scenario involving the release of radioactive powders inside a building, various pathways for the release to the outside environment can exist. This study is presented to show how the multiple building leak path factors (combination of filtered and unfiltered releases) can be evaluated in an integrated manner to assess the magnitude of the source termmore » to be used in the consequence analysis. The core of the analysis is to calculate the leak path factor, which represents the fraction of respirable radioactive powder that is made airborne that leaves the building through the various pathways. The computer code of choice for this determination is MELCOR1. The analysis results can be used for the transport and dispersion of powder material released to the atmosphere and to estimate the resulting dose that is received by the downwind receptors of interest. This work can be used as model for performing analyses for systems similar in nature where releases can propagate to the outside environment via filtered and unfiltered pathways. This example provides guidance to analysts outlining the essential steps needed to perform a sound and defensible analysis.« less
  • Abstract not provided.
  • Abstract not provided.
  • Estimates of the source term from a U.S. Department of Energy (DOE) nuclear facility requires that the analysts know how to apply the simulation tools used, such as the MELCOR code, particularly for a complicated facility that may include an air ventilation system and other active systems that can influence the environmental pathway of the materials released. DOE has designated MELCOR 1.8.5, an unsupported version, as a DOE ToolBox code in its Central Registry, which includes a leak-path-factor guidance report written in 2004 that did not include experimental validation data. To continue to use this MELCOR version requires additional verificationmore » and validations, which may not be feasible from a project cost standpoint. Instead, the recent MELCOR should be used. Without any developer support and lack of experimental data validation, it is difficult to convince regulators that the calculated source term from the DOE facility is accurate and defensible. This research replaces the obsolete version in the 2004 DOE leak path factor guidance report by using MELCOR 2.1 (the latest version of MELCOR with continuing modeling development and user support) and by including applicable experimental data from the reactor safety arena and from applicable experimental data used in the DOE-HDBK-3010. This research provides best practice values used in MELCOR 2.1 specifically for the leak path determination. With these enhancements, the revised leak-path-guidance report should provide confidence to the DOE safety analyst who would be using MELCOR as a source-term determination tool for mitigated accident evaluations.« less