%MurNBrate041851; ]> Memorandum from R. L. Murray and A. C. Menius, Jr. to C. K. Beck [a machine-readable transcription] Murray, Raymond L. 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, MurNBrate041851

Available from: NC State University Archives

Publicly-accessible

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 R. L. Murray and A. C. Menius, Jr. to C. K. Beck <author>Raymond L. Murray</author> <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 April 18, 1951 English non-fiction; prose LCSH 24-bit color; 400 dpi Memorandum from R. L. Murray and A. C. Menius, Jr. to C. K. Beck Typescript 1 p. April 18, 1951 MurNBrate041851

April 18, 1951 TO: C. K. Beck FROM: R. L. Murray and A. C. Menius, Jr. SUBJECT: Rate of Power Rise with Control Rod Removal

1. Removal of the control rod in 10 minutes is estimated to be a safe rate.

2. The rate at which the reactor power P increases with rod removal speed vr is found to be always smaller than that predicted from the steady-state power-rod position curve, ie

After a time delay characterized by a time

(of the order of 10 seconds at the middle of the range) where 1e is the average neutron lifetime, α is the temperature coefficient of reactivity, and To is the initial difference in temperature of solution and coolant, the power rise rate approaches the predicted rate,
.

Thus a test is provided for any pre-assigned rod speed. The maximum slope o the curve above is

Thus at a speed such that the rod is removed in 10 min (600 sec), then

at other points on the curve dP/dx is smaller, of course, and thus dP/dt is smaller.

The analysis loading to those conclusions is given in the Appendix.