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h
3. Additional 238Y is added as required to maintain the denaturing
inequality *
4. Removal of certain fission products Ps accomplished according to
Table 8.
21
Table 8. Removal times for fission products
in once-through cycles
Fission-product
group
Element
Removal
time
Noble gases Kr, Xe 50 s
Seminoble and Zn, Ga, Ge, As, Nb, 2.4 h
noble metals Mo, Tc, Ru, Rh, Pd,
Ag, Cd, In, Sn, Sb
3.1.4.2 Fission-product buildup
A study of 30-year fission-product buildup was made as a f ~rtcti~n of
various continuous removal rates for those products not listed in Table 8.
The reactivity effect may be satisfactorily represented by
where
p = fission-product reactivity effect (%>,
t = time (year),
Y = yield (0.93%/year),
X = burnout rate (6.8 year)-',
R = removal rate (year-1 >.
"Other nonfissile uranium wuclides further dilute the 233U.; dilu-
tion to 12% 23% may require additional 23%.