Iodine release during a steam generator tube rupture
- EG and G Idaho, Inc., Idaho Falls, ID (United States). Idaho National Engineering Lab.
The Nuclear Regulatory Commission requires utilities to determine the response of a pressurized water reactor to a steam generator tube rupture (SGTR) as part of the safety analysis for the plant. The SGTR analysis includes assumptions regarding the iodine concentration in the reactor coolant system (RCS) due to iodine spikes, primary flashing and bypass fractions, and iodine partitioning in the secondary coolant system (SCS). Experimental and analytical investigations have recently been completed wherein these assumptions were tested to determine whether and to what degree they were conservative (that is, whether they result in a calculated iodine source term that is at least as large or larger than that expected during an actual event). The current study has the objective to assess the overall effects of the results of these investigations on the calculated iodine source term to the environment during an SGTR. To assist in this study, a computer program, DOSE, was written. This program uses a simple, nonmechanistic model to calculate the iodine source term to the environment during an SGTR as a function of water mass inventories, flow rates, and iodine concentrations in the RCS and SCS. The principal conclusion of this study is that the iodine concentration in the RCS is the dominant parameter because of the dominance of the primary flashing on the iodine source term.
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 109968
- Journal Information:
- Nuclear Technology, Journal Name: Nuclear Technology Journal Issue: 2 Vol. 109; ISSN 0029-5450; ISSN NUTYBB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
D CODES
DESIGN BASIS ACCIDENTS
FISSION PRODUCT RELEASE
IODINE
NUCLEAR POWER PLANTS
PWR TYPE REACTORS
RADIOACTIVITY TRANSPORT
RADIOISOTOPES
RADIONUCLIDE MIGRATION
REACTOR COOLING SYSTEMS
SAFETY ANALYSIS
SOURCE TERMS