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Table 1

Description of environmental source terms for German NPP's.

Source term name FKI FKF FKA
Reactor type PWR PWR PWR
Initiating event Break on main circulation line (10 cm2) Break on main circulation line (10 cm2) Break of the steam generator (SG) boiler tube (6 cm2)
Description of scenario Core damaged;
CONT not damaged;
Depressurization of CONT by filtered venting.
Core damaged;
CONT not damaged;
Depressurization of CONT by unfiltered venting.
Core damaged;
CONT damaged.
Begin of release (after end of chain reaction) 12.4 h (venting after 57 h; height: ∼150 m) 12.4 h (venting after 57 h height: ∼150 m) 21 h (height: ∼30 m)
Duration of release 86 h (40 h through venting) 86 h (40 h through venting) 50 h (through damaged CONT)b
Total release  
   131I 3 PBq 20 PBq 300 PBq
   137Cs 0.0003 PBq 0.3 PBq 30 PBq
   133Xe 5 000 PBq 5 000 PBq 2 000 PBq
Radiological equivalent of 131I activitya 2.8 PBq 34 PBq 1 600 PBq
INES category 5 6 7
a

Radiological equivalent of the 131I has been calculated according to INES (2009) methodology.

b

Activity release before CONT damage is negligible.