Radioactive Gaseous Effluent Source Terms for Postulated Accident Conditions in Light-Water-Cooled Nuclear Power Plants.

摘要

Releases of gaseous radioactive materials were calculated for a series of postulated accidents for BWRs and PWRs. The purpose was the development of bases for selection of radiation measurement sensitivities for gaseous effluent monitoring instrumentation for accidents. The accidents considered were categorized according to the designations of NUREG-0099,Appendix I, (Regulatory Guide 4.2,Revision 2,July 1976). Eight accident types in five BWR accident classes. Due to the budget limit it was not possible to include calculations for all postulated accidents;therefore,the study should not be considered as a definitive generic study for accident releases. Where postulated accident conditions projected releases into confined spaces,numerical values for peak concentrations are presented. Where releases were projected to be directly to the environment,total release quantities and individual contributions are presented. For accidents involving fuel damage,core radionuclide inventories were calculated using the ORIGEN (ORNL Isotope Generation and Depletion) code. Equilibrium inventories of radionuclides in primary and secondary cooling systems were obtained from NUREG-0016 (BWR) and NUREG-0017 (PWR).