Conception principles for insuring an efficient iodine trapping function on the 1300 MWe light water reactor ventilation system

This paper presents the conception principles retained in order to insure the function ''iodine trapping'' of the 1300 MWe light water reactor's ventilation systems. These principles are the following: treatment of the gaseous waste flow restricted to the building with iodine contamination risk; bypassing of the iodine traps in the case of normal reactor operation with the possibility of a quick tilting in the case of iodine risk; use of the heaters before the traps; use of iodine reloading traps; use of an important activated carbon thickness. Systems of ventilation, together with their iodine traps, are presented