ORNL-1816 - the Molten Salt Energy Technologies Web Site
ORNL-1816 - the Molten Salt Energy Technologies Web Site ORNL-1816 - the Molten Salt Energy Technologies Web Site
ANP QUARTERLY PROGRESS REPORT - 103 5 2 1 O2 5 $ 2 - X 3 10 z E 5 z w .! - 2 z I + I 5 2 10-1 5 2 2-01-057-65-28 10-21 I I I \ \ I I I I I I I I I i0 60 70 80 90 100 110 120 I30 140 150 160 170 2, DISTANCE FROM SOURCE Icm) Fig. 13.2. Thermal-Neutron Flux in Oil With and Without Bismuth Slab to Suppress Photoneutron Production. measurements were made in the oil behind the 29.1-cm thickness of the lithium (Fig. 13.3). From these measurements the value of 1.01 k 0.04 barns was calculated for the removal cross section of lithium by the procedure presented below. All previous removal-cross-section measurements were made in water. In order to verify that a correction to a water medium would not be neces- y for these measurement^,^ thermal-neutron asurements were also made in oil behind a material which had a uR predetermined in water. The definition of a removal cross section has been given as a parameter characterizing the attenuation of fission neutrons by materials either mixed with hydrogen or followed by a hydrogenous layer; see H. Goldstein and R. Aronson, “Effective Removal Cross Sections-Theory,” abstracted in Symposium on Fission Physics and Classified Nuclear Physics for Reactors 13-15, 1954, ORNL CF-54-10-11, 2- ._ L -.. ‘x.. Fig. 13.3. Thermal-Neutron Flux Beyond Lithi- um in Oil. The material chosen was bismuth, and the measure- ments in oil behind a 22.9-cm-thick slab *are plotted in Fig. 13.4. From these measurements a value of aR = 3.48 barns was calculated, which can be compared with a value of 3.49 9 0.35 barns previously determined for bismuth from measure- ments in water.4 Gamma-ray dose measurements made throughout the experiment are plotted in Fig. 13.5. The removal cross section of lithium was calcu- lated by a method suggested by Bli~ard:~ 4C. L. Storrs, G. T. Chapmon, and E. P. Blizarcf: “Effective Remova I Cross Sections -Experiments, ORNL CF-54-10-11, op. cit., p 101 (Oct. 8, 1954). 5E. P. Blizard, Procedure for Obtaining Effective Removal Cross Sections from Lid Tank Data, ORNL CF-54-6-164 (June 22, 1954). ** . * *
where q2 z /j a2 t L 4h(z + t) - a2z DOi,(z) = dose in oil at z cm from the source, DM(z + t) = dose in of shield and z cm of oil, ho(z) = relaxation length of oil at z cm, hM(z + t) = relaxation length behind the shield and in oil at (z + t) cm, PERIOD ENDING DECEMBER 70, 7954 h = average of ho(z) and AM(” -i- t) , a = source radius = 35.56 cm, Zt = (Zt), + (Zt)ss, the sum of macroscopic removal cross sections of sample and container, where the subscript “ss” refers to the stainless steel walls of the lithium tank. Stainless steel was assumed to be the same as iron (aR = 1.98 barns/atom). The numerical values for these terms are given in Table 13.1. GE-ANP HELICAL AIR DUCT EXPERIMENTATION J. M. Miller The GE-ANP helical air duct experimentation at the LTSF has continued with thermal-neutron flux measurements beyond a 35-duct array. As described previously,6 the ducts are 3-in.-llD steel 6J. M. Miller, ANP Quar. Prog. Rep. Sept. 10, 1954, ORNL-1771, p 166. lo4 5 5 2 .0Km 2-01 -057-65-3f 140 160 Oil Beyond
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where<br />
q2<br />
z /j<br />
a2 t<br />
L<br />
4h(z + t) - a2z<br />
DOi,(z) = dose in oil at z cm from <strong>the</strong><br />
source,<br />
DM(z + t) = dose in<br />
of shield and z cm of oil,<br />
ho(z) = relaxation length of oil at z cm,<br />
hM(z + t) = relaxation length behind <strong>the</strong> shield<br />
and in oil at (z + t) cm,<br />
PERIOD ENDING DECEMBER 70, 7954<br />
h = average of ho(z) and AM(” -i- t) ,<br />
a = source radius = 35.56 cm,<br />
Zt = (Zt), + (Zt)ss, <strong>the</strong> sum of macroscopic<br />
removal cross sections of<br />
sample and container, where <strong>the</strong><br />
subscript “ss” refers to <strong>the</strong> stainless<br />
steel walls of <strong>the</strong> lithium<br />
tank.<br />
Stainless steel was assumed to be <strong>the</strong> same as<br />
iron (aR = 1.98 barns/atom). The numerical values<br />
for <strong>the</strong>se terms are given in Table 13.1.<br />
GE-ANP HELICAL AIR DUCT<br />
EXPERIMENTATION<br />
J. M. Miller<br />
The GE-ANP helical air duct experimentation<br />
at <strong>the</strong> LTSF has continued with <strong>the</strong>rmal-neutron<br />
flux measurements beyond a 35-duct array. As<br />
described previously,6 <strong>the</strong> ducts are 3-in.-llD steel<br />
6J. M. Miller, ANP Quar. Prog. Rep. Sept. 10, 1954,<br />
<strong>ORNL</strong>-1771, p 166.<br />
lo4<br />
5<br />
5<br />
2<br />
.0Km<br />
2-01 -057-65-3f<br />
140 160<br />
Oil Beyond
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