Analysis of Fission Products’ Release in Pebble-Bed High-Temperature Gas-Cooled Reactor Fuel Elements Using a Modified FRESCO II Numerical Model

Table 3

Comparison of two methods for Cs-137 fractional release rates from a pebble.

Temperature (°C)	600	700	800	900	1000	1100	1200	1300	1400	1500	1600
FRESCO-II (s^−1)	3.9192E − 16	1.7100E − 15	6.5096E − 14	6.3373E − 13	2.4107E − 12	2.3764E − 10	1.5134E − 09	3.9838E − 09	7.1964E − 09	9.7246E − 09	1.0717E − 08
FERRA (s^−1)	3.9198E − 16	1.7096E − 15	6.5130E − 14	6.3414E − 13	2.3990E − 12	2.3774E − 10	1.5145E − 09	3.9864E − 09	7.2005E − 09	9.7284E − 09	1.0718E − 08
Ratio	0.9998	1.0002	0.9995	0.9994	1.0049	0.9996	0.9993	0.9993	0.9994	0.9996	0.9999