Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 20 of 205
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
The resulting ratios of cylinder to sphere extrapolation distances appear in Fig. 6, in
which some dimensions were obtained experimentally and some were computed by the
TWODANT'3 code with Hansen-Roach cross sections.30 Figure 7 gives similar extrapo-
lation dist ances for reflected and unretlected U1(93.5) metal disks, where 6, = 2.0 cm is
assumed for an unreflected sphere and reflector savings are consistent with Fig. 5.
In Figs. 6 and 7 the abscissa was chosen such that at zero the value of b, determines
the thickness of an infinite slab ( (ir/B) - 2bl and at unity the value determines the
radius of an infinite cylinder I= (2.A05/'B) - 6,1. The calculated end points of Fig. 6 were
obtained by means of the ONEDANT code12 and Hansen-Roach cross sections."' In Table
., the value of the sphere extrapolation distance for 235U0,F solution at H/235U = 50
was obtained from Stratton's report LA-361214 by combining the extrapolation distance
without reflector from his Eq. 2 and the reflector savings from his Table V. Results are 6, =
5.8 cm with a water reflector and b, = 2.2 cm wit h a 0.13-cm-thick stainless steel reflector.
Other extrapolation distances in Table 5 (for more dilute 23,U solutions, 233U solutions,
and Pu solutions) were obtained from sphere, infinite cylinder and infinite slab :iu.-nsions
calculated by ONEDANT.10"2 The listed sphere extrapolation distances, then, are those
required to bring both calculated end point extrapolation distances into coincidence with
the end points of Fig. 6.
With 0.13 cm stainless steel reflection, 6 = 2.2 cm from Stratton's spheres applies uni-
versally to the transformation of solution cylinders. It has been confirmed empirically
within 2% for U(93.2)02F2, 233U02F2, and Pu(NO3)4 + 1 N HNO3 solutions over the
experiment ally available ranges of height-to-diameter ratios.
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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/m1/20/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.