ZPPR-20 Phase D : A Cylindrical Assembly of Polyethylene Moderated U Metal Reflected by Beryllium Oxide and Polyethylene. Page: 58 of 259
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NEA/NSC/DOC(95)03/II
Volume II
HEU-MET-MIXED-012
Now, with a relatively simple case in hand, consider the core edge position 151-52 and its symmetric
counterparts 151-46, 148-49 and 154-49 in Figure 7. These positions have the core region on the
inboard side of the drawer loading and the reactor vessel region on the outboard side. This is a
situation where reflection or rotation of the plate loading in 151-52 is needed to get the plate
loadings for the other positions. Table 1 indicates that the symbols for the four drawer masters are
F, G, m and n, respectively. Table 3 indicates that the drawer masters are 0203, 0204, 0713 and
0714, respectively. Looking at drawer master 0203 in Table 4, it can be seen that plates for core
materials are in the lower X side of the drawer and reactor vessel plate materials are in the upper X
side, consistent with Figure 7. Comparing drawer master 0204 in Table 4, its loading is seen to be
reflected about the X midplane of the drawer (but with a uranium column modification to
accommodate thermocouples in master 0204). These two drawer masters have the normal plate
orientation; the smallest plate dimension is in the X direction, the Y dimension is typically 2 inches
and the longest dimension is in the Z direction. The next two drawer masters have a rotated drawer
loading. There the plates are rotated 900 about the Z axis so that the X dimension is typically 2
inches and the Y direction has the smallest dimension. Drawer master 0713 can be seen in Table 4
to have rotated plates and to have the core plates below (lower starting Y values) and the vessel
plates above, consistent with Figure 7. Drawer master 0714 can be seen in Table 4 to be essentially
the reflection of Drawer Master 0713 about the Y midplane, as it should be.
Any readers who have persisted this far are indeed dedicated. These readers should understand the
loading well enough to be able to write a computer program to process the information in the tables.
But there is no need, since programs already exist to do this. These readers should also understand
that to process the information by hand would be an overwhelming endeavor.
1.3 Description of Material Data
The composition data were taken from working documents that are referred to informally as "hot
constants memos". The original documentation on most of the inventory used in ZPPR has been
lost, but the hot constants memos are available. These memos give average composition by batch or
lot, but not uncertainties. The issue of estimating composition uncertainties is addressed in
Section 2. The ZPPR (Zero Power Physics Reactor) hot constants memo was used as a first source
for all materials because it includes the most complete and accurate description of trace elements.
Five types of stainless-steel-clad enriched uranium fuel plates were used in Assembly 20D
Loading 129. Uranium and cladding masses and uranium dimensions for these plates are given in
Tables 5 and 6. As seen from Tables 5 and 6, there are small differences in relative uranium and
stainless steel isotopics between the differing plate sizes. As noted in Section 1.2.2, the cladding
material thickness on the X and Y faces of the uranium plates is 0.005 inches (0.127 mm), the
finished plate Y dimension is 2.010 inches, but the finished plate X dimension is 0.015 greater than
the uranium width (finished plate is 0.074 or 0.1365 inches). Each Z face has a 0.055-inch-thick
(1.40 mm) porous end plug, making the finished plate length 0.110 inches longer than the nominal
uranium length.
a T. S. Huntsman, ZPPR Materials Compositions, July 1983.
Revision: 0
Date: September 30, 2006 Page 56 of 253
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Lell, R.; Grimm, K.; McKnight, R.; Shaefer, R.; Division, Nuclear Engineering & INL. ZPPR-20 Phase D : A Cylindrical Assembly of Polyethylene Moderated U Metal Reflected by Beryllium Oxide and Polyethylene., report, September 30, 2006; United States. (https://digital.library.unt.edu/ark:/67531/metadc899618/m1/58/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.