%MurNBalliners052151; ]> Memorandum from A. C. Menius, Jr. to C. K. Beck [a machine-readable transcription] Menius, A. C., Jr. Creation of machine-readable version: Russell S. Koonts Creation of digital images: Russell S. Koonts Conversion to TEI.2-conformant markup: NCSU Science and Technology Electronic Text Center. ca. 9 kilobytes NCSU Libraries. Raleigh, NC. Modern English, MurNBalliners052151

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URL: http://www.lib.ncsu.edu/archives/etext/engineering/reactor/murray/

 2000

Nuclear Reactor Digitization Project

Raymond L. Murray Reactor Project Notebook

 Illustrations have been included from the print version. Scanned by Russell Koonts with Photoshop 5.0 software. Memorandum from A. C. Menius, Jr. to C. K. Beck <author>A. C. Menius, Jr.</author> <respStmt> <resp/> <name/> </respStmt> </titleStmt> <editionStmt> <p></p> </editionStmt> <extent>1 p.</extent> <publicationStmt> <publisher></publisher> <pubPlace></pubPlace> <date></date> <idno>Manuscript copy consulted: NCSU Libraries call number UA105.16</idno> </publicationStmt> <seriesStmt> <p/> </seriesStmt> <notesStmt> <note></note> </notesStmt> </biblFull> </sourceDesc> </fileDesc> <encodingDesc> <projectDesc> <p>Prepared for the NCSU Libraries Science and Technology Electronic Text Project.</p> </projectDesc> <editorialDecl> <p>Spell-check and verification made against printed text using Notetab spell checker.</p> <p>The lineation of the manuscript has been maintained and all end-of-line hyphens have been preserved.</p> <p>The images exist as archived TIFF images, one or more JPEG versions for general use, and thumbnails.</p> <p id="ETC">Keywords in the header are a local Electronic Text Center scheme to aid in establishing analytical groupings.</p> </editorialDecl> <refsDecl> <p>ID elements are given for each page element and are composed of the text's unique cryptogram and the given page number, as in NEprop033050a for the title page of Clifford Beck's Proposal.</p> </refsDecl> <classDecl> <taxonomy id="LCSH"> <bibl> <title>Library of Congress Subject Headings May 21, 1951 English non-fiction; prose LCSH 24-bit color; 400 dpi Memorandum from A. C. Menius, Jr. to C. K. Beck Typescript 1 p. May 21, 1951 MurNBalliners052151

NCSC-19 Murray May 21, 1951 To: C. K. Beck From: A. C. Menius, Jr. Subject: Effect of Proposed Al Liners in Vicinity of Reactor

In the present design 4" I.D. Al liners 1/8" thick are to traverse the reflector and reach the reactor vessel. There will be in all ten of these. In the reflector near the surface of the reactor there will be considerable contamination of the graphite due to this Al which will result in an increase in the amount of U235 needed for criticality as well as a distention of the flux in that region.

If we consider a six inch section around the reactor 6" high and assume a homogeneous mixture, the following data is obtained (See Calculations):
For graphite Σ = 0.00036 For graphite and Al Σ = 0.00095

This means that the diffusion length L is

=950 L ≃ 31 cm.

Calculations: Volume of Al = 10(π10.16)(.32)(15) = 1530cm3 Mass = 1530(2.4) = 3670 gms Volume of region= π(r12 - r22) 15 cm= = π(302 - 152) 15= π15(900-225) = π15(675) = 47.2(675) = 31800 cm3

0.115 = (0.222) 0.115x1023 = 0.0258x1023 Ncc = 2.6x1021
Σ = 2.6x1021 • 0.23x10-24 Σal = 0.59x10-3 = 0.00059 For graphite, assume no change in density, Σc = 0.00036