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Nuclear Reactor Digitization Project

R. L. Murray Reactor Project Notebook

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.

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This note answers your request for calculations on the heavy concrete.

The composition of Barytes mix, according to the Carbide purchasing agent
per yd

3,
72.07.315.1310 lb (37.5 gallons)5.6100.0

Since the Colemanite consists of

2O32O

The boron content at the final mix is almost exactly 1%, as computed below:

The density of the concrete is

The ORNL figures for this concrete are 1% Boron, 3.5 specific gravity. The
neutron flux data show that in a 6 foot shield, the attenuation with the 1% B

The minimum cost figures quoted by CCC&D are

The fractions of each in the mix are Barytes 3970/5510 = 0.72, Colemanite 400/5510 = 0.072.
Assuming a figure of $16 a ton for Portland Cement

the cost is

[(0.72)(24) + 0.072(75) + (0.15)(18)] 5510/2000 = $70/yd

3

A good estimate for the volume of concrete in the shield3, so that the
cost would be ($70)(107)= $7500. Of this, the critical item so far as shipping

(from

7.2% of the mix, and 20% of the cost, so it would probably be worth the

ment

of the Boron cement. Special forms might be needed also, which would run up

the construction cost. The cost estimates for a 4 ft inside lining corresponding

to 1440 ft

3 = 53 yd3 are computed for consideration, anyway. This is half the
reactor volume. Substituting Barytes for Colemanite would reduce the yd

3 cost to

Letter of

Based on

Freight agent,

Barytes:Ba 41.9%O 31S 9.9Fe 8.7Co 4.5Si 1.7other 3.3100

Quoted by

Assume top slab = hole insideV= 17x17x10 = 2890 ft 3=107 yd3