Copy ITEM	LOS ALAMOS	PAGE REFER- ENCE	N. C. STATE	PAGE REFER- ENCE	COMMENTS
Active Material	14 % isotopic concentration Uranyl nitrate aqueous so- lution 870 grams, 13.5 liters	2	80-90% isotopic concentration Uranyl sulfate agueous so- lution 915 grams, 14.36 liters	22-24	UO2SO4 used in low power boiler; later choice of UO2(NO3)2 based on ease of ether extraction pro- cess. Higher U-235 concentration chosen to minimize fuel material.
Shape of Core and Material of Construction	Spherical, 1 foot diameter Stainless steel	2	Cylindrical, 27.2 cm O.D., 27.0 cm high Stainless steel	24	Cylindrical shape more con- venient construction.
Power level & Cooling method	5.5 kw (later 10 thru 25) 6 turns of 1/4" I.D. stain- less steel 157" total length, helix Flow rate 50cc/sec.	2 17;Fig4	10 kw 3 Helical coils of 1/4" I.D. stainless steel 30 ft. total length Flow rate 3 gallons/min.	20 20;Fig6	Equivalent cooling system.
Entrances	"Glory hole" (horizontal)	16 18 31	Re-entrant tube (vertical) Level indicator; contact recorded electrically Thermocouples Sampling line	36 42 30 41
Tamper Reflector	Be O shell; graphite (24" x 24" x 27"); (60" x 48" x 60")	20 Fig2,6,7	Graphite 16" thick on all sides, 4" x 4" bars.		BeO not use in N. C. State reactor because of expense.
Drip pans	.020" stainless steel pan be- tween BeO and graphite 3/16" lead pan below graphite	20 Fig.7	Aluminum and stainless steel concentric envelope 38.3 cm I.D. close fitting, but shell filled with graphite. - - - - - Secondary flat catch basin, below graphite - - - - - Tertiary lead, shild	24 Fig.7 27 28	Equivalent
Excess Reactivity	0.0150/units?	35-36	0.0165	23

*L.A. 394  **Program Administration and Installation Design of the Nuclear Reactor

ITEM	LOS ALAMOS	PAGE REFER- ENCE	N. C. STATE	PAGE REFER- ENCE	COMMENTS
Shielding	8" pier of Bi between tamper and thermal column 1/32" Cd, 4" Pb, 5 ft. concrete	21 Fig.10b	4"/2" lead-additional graphite out- side 6 ft concrete. Cd and 4" lead on thermal column	38 17
Thermal Column	5' cubical pile of graphite Cd curtain 4' from front	20	Several feet of graphite, with 4 exposure ports	39 Fig.8
Control and Safety Rods	Two regulating shims, on con- trol rod, one safety rod Cadmium absorber Total equivalent 160g U235 Magnetic coupling\??	21	Two boron-filled tubes, one control, one safety Cd sheet .02" x 2" wide shim for regulation Total grams 170 Magnetic coupling	28
Instruments	Galvanometers activated by two kinds ionization chambers (BF3, U-235) Three detectors that drop con- trol and safety rods	27-30 Fig20	Fission chambers (6 in number) Three chambers will trip safety devices Additional scintillation detectors	30
Radioactive Products	50cc/sec at air flow into space above solution by 1/4" tube; solution catcher, platinum gauze to prevent back explosion. 200 ft. tube passage to silica gel drier, 200 + 1800 ft. tube to a distant point. Stack release.	18	Dilution of gases, hydrogen and oxygen recombined, residual gas held in storage tank for decay, dilute final gas with large volumes of air and release from tall stack.	43	Only new features are the combination of gases and the holding for decay products.
Function	Activations of material by neutron irradiation in center of sphere or thermal column Fission spectrum source of neutrons Transmission and scattering ex- periments	42	Preparation of radioactive samples Irradiation of animals Neutron experiments Instruction in Nuclear Engineering
Decontami- nation of boiler solution	Drain and store solution in tank of underground vault Ether extraction of uranium	12	Pump out to lead enclosed traps, or remove entire reactor inside lead plus aluminum shield, and ship to Oak Ridge. No processing of solution at Raleigh.