Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 87 of 205

POISONED SYSTEMS

HOMOGENEOUS ABSORBERS
Uranium 235
Changes in the concentration of uraiiumi reIquir-d to compensate for boric acid additions
to certain critical 1 O2 (NO1). solot ii s have been est ablished at OlINL.5 All assemblies
were essent ially un reflect ed 59-cu- diam spheres. For U'(93.2), init ially critical at H /25 U
- 1380, the system remained critical wh ii .55 atois of 2l' were added per ato
of lboron at concentrations up th ().23 g I: L. lIata also exist on poisoning by nitrate,
phosphate, and bisluith.
H an ford crit ical ex periment sl "- t hat det ermined the in H ence of catnium uit rate dissolved
in U(65)02(NO 1)2 solut ion, or ill the water reflect or, supported t he design of dissolvers at
the Idaho Checical Processing Plant. Solution was cont ained ini a cylinder 24.2-cm-i.d. by
107-cm inside height.. Wat er reflect or extended to ihe top of t he vessel and was uiderneath
the tank. The observed critical conditions are summarized ill Table 22.
ORNL also reported experiments related to the design of dissolvers. In one series84,
aluninrnm-clad, uraiiiuni-bearing, fuel plates were latticed in water, il dilute
U(92.6)O2(N03)2 solution, and in uranyl-nitrate solution in which boron was also dis-
solved. i another >cries," V(62.4)(0 BeO fuel pins were latticed in water, in boron
solution, in dilute V(92.6)O0(NO3)2 solution, and iii water containing both boron and
uraivI nitrat e.
TABLE 22. EFFECTS OF DISSOLVED CADMIUMl NITRATE ON THE CRITICAL
HEIGHT OF WATER- REFLECTL: IE ( (85)O,(NO3)2 SOLUTION"
IN A 24.2-cm-i d. CYLINDER
Crit ical
Cadmnium ConcentrationgLL Height
in Soiuition ili Reflector (cni)
0 0 22.33
O15 30.58
1.98 ) 28.20
3.98 0 37.75
6.35 0 76.05
" The solut ion cont aiied 0.194 INI cxcess nitr ate.

83

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Paxton, H.C. & Pruvost, N.L. Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision, report, July 1, 1987; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1109879/m1/87/ocr/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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