Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 82 of 205

                                
HOMOGENEOUS HYDROGEN-MODERATED "U

liilike the survey of* IT ( 93) solut iou cvinIders with i ldrge height /diaiiet er range, all cit ical
23U soltiu cylinders were ItealyI equttciilt r'il", ThIls deduced iifiuite cylinder and slab
dimensions are tore dependent upon the calculatioi s of Table 5 and Fig. 6. With one
exception, the reflector, where present, was paraflii instead of water. A single imeasuremeut
with water reflection gave essentially t he samie critical dimensions as paraftin. France also
has reported dat a for partially reflect d  'IU solution in cylinders. 5992
The initial y U :TsolultiOn survey was sipplemieited( by spherical mieasreiiets, all at Oak
R idge."5'S1  : Crit iCal parameters IOr .11 }, similar t 1 dat a prescuted earlier for U(93) and
plut onihm, appear in Digs. 36-39.
li addition to the 1Uj3(),F '  s(lutins represented ill Figs. 36-39, there were data for a
similar range of crit ical ':ilO2( N O3 ) sluit ious. H at ins of uranyl nit rate t.o uranyl fluoride
critical masses, inutienced by nit rogeu capture, appear in Table 21. B-cause of significant
differences for concentrated solutions, ratios are given as functions of both 2.11 clelisit.y
and H/2"33U. Table 21 may be presumed to apply also to 11(93) solutions, for which no
direct c-nparison exists, but see Ref. 44.
TABLE 21. SPH ERICAL WATER-REFLECTED CRITICAL MASS RATIO,
mIic*uUOA(N03)2/mIIc.Al1O02F] SOLUTIONS, vs 23U DENSITY
A ND I1_3411
233 Density    Criti'al Mass                         Critical Mass
(kg/l )          Ratio                   11 ' U        Ratio
0.0338           1.00                      760         1.02
0.0492           1.00                      51V         1.01
0,064            1.03                      391         1.03
0.100            1.06                      247         1.02
0.160            1.04                      151         1.00
0.274            1.14                      84          1.09
0.381            1.23                      58          1.1
0.491            1.13                      .12         1.26

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