Accident source terms for light-water nuclear power plants using high-burnup or MOX fuel. Page: 3 of 60
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Accident Source Terms for Light-
water Nuclear Power Plants Using
High-Burnup or MOX Fuel
D.A. Powers, M.T. Leonard, R.O. Gauntt
Sandia National Laboratories
Albuquerque, NM 87185-0748
R.Y. Lee and M. Salay
Office of Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, D.C. 20555-0001
Representative accident source terms patterned after the NUREG-1465 Source
Term have been developed for high burnup fuel in BWRs and PWRs and for
MOX fuel in a PWR with an ice-condenser containment. These source terms
have been derived using nonparametric order statistics to develop distributions
for the timing of radionuclide release during four accident phases and for release
fractions of nine chemical classes of radionuclides as calculated with the
MELCOR 1.8.5 accident analysis computer code. The accident phases are
those defined in the NUREG-1465 Source Term - gap release, in-vessel release,
ex-vessel release, and late in-vessel release. Important differences among the
accident source terms derived here and the NUREG-1465 Source Term are not
attributable to either fuel burnup or use of MOX fuel. Rather, differences among
the source terms are due predominantly to improved understanding of the
physics of core meltdown accidents. Heat losses from the degrading reactor
core prolong the process of in-vessel release of radionuclides. Improved
understanding of the chemistries of tellurium and cesium under reactor accidents
changes the predicted behavior characteristics of these radioactive elements
relative to what was assumed in the derivation of the NUREG-1465 Source
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Salay, Michael (U.S. Nuclear Regulatory Commission, Washington, D.C.); Gauntt, Randall O.; Lee, Richard Y. (U.S. Nuclear Regulatory Commission, Washington, D.C.); Powers, Dana Auburn & Leonard, Mark Thomas. Accident source terms for light-water nuclear power plants using high-burnup or MOX fuel., report, January 1, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc834935/m1/3/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.