Radioactive Iodine and Krypton Control for Nuclear Fuel Reprocessing Facilities

Table 2

Estimated DFs required for the volatile radionuclides for different selected types of used fuels and burn-ups.

Nuclide	Assumed dose limit for the volatile radionuclides = 25 mrem/y and 75 mrem/y to thyroid (40 CFR 190)			Assumed dose limit = 2.5 mrem/y and 7.5 mrem/y to thyroid (10% of the 40 CFR 190 limits)
	PWR/UOX,; BU = 60; GWd/tIHM	PWR/MOX,; BU = 100; GWd/tIHM	AHTGR; BU = 100; GWd/tIHM	PWR/UOX,; BU = 60; GWd/tIHM	PWR/MOX,; BU = 100; GWd/tIHM	AHTGR; BU = 100; GWd/tIHM
^3H	25 (1 after 57 y cooling)	160 (1 after 90 y cooling)	42 (1 after 66 y cooling)	600 (1 after 110 y cooling)	720 (1 after 120 r cooling)	590 (1 after 110 y cooling)
^14C	1	1	4	10	15	30
^85Kr	9 (1 after 34 y cooling)	4.2 (1 after 22 y cooling)	9.2 (1 after 34 y cooling)	18 (1 after 45 y cooling)	13 (1 after 40 y cooling)	62 (1 after 64 y cooling)
^129I	380	630	650	3800	8000	6600

(1) PWR: pressurized water reactor.
(2) UOX: used uranium oxide fuel.
(3) MOX: mixed U and Pu oxide fuel.
(4) GWd/tIHM: Gigawatt-day per tonne initial heavy metal.
(5) AHTGR: advanced high temperature gas reactor.
(6) BU: fuel burn-up. The ³H and ¹⁴C DFs are based on the whole body dose limits—the doses to the organs are less restrictive. The ⁸⁵Kr DFs are based on the fuel cycle emission limit and the whole body dose limits—the doses to the organs are less restrictive. The iodine DFs are based on control efficiencies needed to meet the fuel cycle emission limit and the thyroid dose limit—the whole body dose is less restrictive.
(7) These DF values have been rounded to not more than two significant figures.