The Fukushima Event: The Outline and the Technological Background

Table 4

Fraction of radioactivity release from core to containment in the case of LBU fuel (NUREG 1465, 1995 and SAND 7697, 2007, or [6, 16]).

Fission product category	Fraction LBU***	Fraction HBU***	Notes*
Noble gases	1.0	1.0
Halogens	0.91	0.55	Lower value (factor 1.5)
Alkali Metals	0.31	0.27	Higher value (factor 2)
Tellurium	0.76	0.80
Barium-Strontium	0.06	0.07	Higher value (factor 4.5)
Noble Metals**	0.07	0.055	Lower value (factor 6)
Lanthanides**	0.00021	0.0012	Higher value (factor 25)
Cerium**	0.00021	0.0065

* Calculated in [16], and related to LBU. **There is no gap-release. ***“Decontamination factor”.