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Seismic Considerations For the Transition Break Size (NUREG-1903)On this page: Download complete document The following links on this page are to documents in Adobe Portable Document Format (PDF). See our Plugins, Viewers, and Other Tools page for more information. For successful viewing of PDF documents on our site please be sure to use the latest version of Adobe. Publication InformationManuscript Completed: February 2008 Prepared by 2Brookhaven National Laboratory 3Engineering Mechanics Corporation of Columbus 4Battelle 5James J. Johnson & Associates 1Office of Nuclear Regulatory Research AbstractThe U.S. Nuclear Regulatory Commission (NRC) has been considering revision of the
regulatory requirements for the emergency core cooling system (ECCS), as set forth in Title 10,
Section 50.46, of the Code of Federal Regulations (10 CFR 50.46); Appendix K to 10 CFR Part
50; and General Design Criterion (GDC) 35. In particular, those requirements state that the
ECCS shall be sized to provide adequate makeup water to compensate for a break of the largest
diameter pipe in the primary system [i.e., the so-called "double-ended guillotine break" (DEGB)].
Consequently, in order to risk-inform the break size, the staff of the NRC proposed the concept
of transition break size (TBS). In addition, the NRC developed pipe break frequencies as a
function of break size using an expert elicitation process for degradation-related pipe breaks in
reactor coolant systems of typical boiling- and pressurized-water reactors. That elicitation focused on
determining event frequencies that initiate by unisolable primary side failures that can be |
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