Screening releases inside for accidents

For quantification of impacts inside facility the SAFRAN uses release screening values. The SAFRAN database included release screening values are calculated for the following exposure conditions:

• the effective dose to worker from release of any considered radionuclide is 0.1 mSv;
• the time from release till worker leaves the room is 1 hour;
• the distance from the release point to the worker exposure location is 1 m.

The “Gradual Mixing / Complete Mixing” model is used for calculation of the release screening values with following parameters:

• calculations are performed for the room of 50 m³ volume;
• it is conservatively assumed that there is no extraction of contaminated air from the room, i.e. air exchange rate is 0;
• it is conservatively assumed that all released activity is respirable.