Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 80 of 205
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WATER-MODERATED PLUTONIUM AND PLUTONIUM-URANIUM
Consideration of the Plutonim Recycle Programi led to lianford critical experimuellts with
water lattices of pluto imu-aluniiiiumi rods."' To, maintain a reasonable number of ele-
muents, 5 wt, I' l in alb1111i1umn was chosen instead of the 1.8 vt % Pu considered for recycle.
Rods of 1.21-cu- diam and 1-m length were clad with 0.076-ciim-thick Zircaloy-2. Mea-
siled bucklinlgs and extralol'atil distances f r varios spacings of roids in a hexagonal
lattice are given il Table 19, with critical v hI iies and masses of corresponding water-
refhec ted equlilateral cylidveri:.
TA BLE 19. lI}ENA( NAL \\ATEIk LAT'l('ESa OF 1.29-cm- BY 61-cmi- RODS OF
5 \V t i Pu (5% '"iPi) - A LI'IIN'.\ Ni'CLA D \VITH 0.076-cm-thick
(10 4 cnm2)
Volume Critical Mass
(L) (kg Pu)
Also at Hanford. Fast Test React or fuel pius became available for measurements of square-
pitch water-Flooded lattices."12 The fuel of each pin consisted of a P1iiU2- '(naturalO2
iMixture containii hg I .81 wt " plutonimo and Ihad dimensions 0.494-cii diam by 91.4-cm
length. The plut niuml content of a pin averaged 34.2 g and contained 1 .5% 241 Pu. '1 he
type 316 st ainless-st eel cladding was 0.038- ci thick. Lattice charact erist ics appear in
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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/m1/80/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.