Memorandum from Newton Underwood to Dr. Clifford K. Beck

%MurNBdisposal112151; ]> Memorandum from Newton Underwood to Dr. Clifford K. Beck Machine readable transcription Underwood, Newton Creation of machine-readable version: Russell S. Koonts Creation of digital images: Russell S. Koonts Conversion to TEI.2-conformant markup: Russell S. Koonts ca. 9 kilobytes NCSU Libraries Raleigh, NC Modern English, MurNBdisposal112151

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

24 October, 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 Newton Underwood to Dr. Clifford K. Beck Newton Underwood

1 p. Manuscript copy consulted UA 105.16

Prepared for the North Carolina State University Science and Technology Electronic Text Center

The lineation of the manuscript has been maintained and all end-of-line hyphens have been preserved.

Keywords in the header are a local Science and Technology Electronic Text Center scheme to aid in establishing analytical groupings.

Library of Congress Subject Headings November 21, 1951 English LCSH manuscript 24-bit color: 400 dpi Memorandum from Newton Underwood to Dr. Clifford K. Beck Typescript 1 p. November 21, 1951 MurNBdisposal112151

MurrayNCSC-41 November 21, 1951 TO: Dr. Clifford K. Beck FROM: Newton Underwood SUBJECT: Disposal of Radioactive gases from reactor. CC: Reactor Committee

Computation shows that on the basis of 6 hours on at 10 Kw and 18 hours off (repeated operation), the amount of Xe133 produced per 24 hours is ~ 12 curies.

It is evident that the same number of gas molecules that enter a disposal system must leave the system under steady state conditions unless they are removed by some means. It is assumed that the average time required for a molecule to go through the system represents the time which should be considered as the decay time of all of the mole- cules introduced into the system.

If it is agreed that the dimunition achieved by delaying the gas 4 half lives is adequate, this implies that the disposal tank should have a capacity equal to 21 times the daily output volume. Hence, the numerical value of the daily output volume is decisive and should be kept as low as practical. The size of the tank and the cement tank in which it is to be enclosed can only be determined after a firm figure is given for this daily output volume. It is to be noted that the same percentage of .uncertainty involved in this figure is also involved in the gas disposal volume.