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L ‘z : 260 240 220 200 180 Ioc 80 60 40 20 c Pu - Ni tan pU-TU taml OY hydride- _oY4f.i_tam~ OY - TU tome LO(?)-Tu to H-Tu tompe TU-TU tamp ( , APPROVED FOR PUBLIC RELEASE ‘w:”” :: ““” 5 1.0 1.5 2.0 : RADIAL POSITION ( In) REACTIVITY CONTRIBUTIONS BY MATERIALS ADDED TO HYDRIDE ASSEMBLIES FIS&QNO&L< MA;&&”;, ;;$ ● O** ● *e* ● : ● 9 ● 0 ●:a :00 ● 00 :0s ● 0 ’56- APPROVED FOR PUBLIC RELEASE \ K !. -
● a ● a. ● ** 9:0 :00 ● e ● *9 9*** ●0:: :0 which was noted for the abaorber”e~s&e& tiO.b&*s&%ained. The W curves, typioal of absorbers, appear to be out of place in the tamper fam12y. Scattering and absorption contributions by Tu, i.e., with fission effects subtracted, are indicated by the dotted curve for the Ni tamper and the dashed curve for Tu tamper. Fission effects of 28 were estimated by applying 28 to 25 fission catcher activity ratios (Fig. III&) to 25 reactivity changes resultlng from fission(from Fig. IV-6). Although reactivity changes per gin-atomare greater for Tu than Ni at the position outside the hydride (3.3SN radius), per unit volume, Ni is 1.4 times as effective as Tu for the Tu tamper and 1.1 times as effective for the Ni tamper. This consideration led to the critical mass measurements on Ni lined Tu tampers, which were described in Part I. Reactivity change-radius curves for materials which show a large positive contribution near the core center are given in Fig. IV-6. A Tu curve is repeated to emphasize the scale. Degradation of neutron energy by single- step elastic scattering can account for the large central effect of H. From the Oy and Pu data, the ratio of effective fission cross sections, ~~25) / ~~9), may be obtained. The Oy curve is corrected for 28 contribution and both 25 and 49 are corrected for scattering on the assumption that it is the same as for Tu (for the latter correction, Tu data in turn are corrected for fission). If~-1-oc = 1.52 for 25 and 2.02 for ~9(7) (appreciable x reduces these values), the fission cross section ratios of Fig. IV-7 are obtained. APPROVED FOR PUBLIC RELEASE In cases where the principal contributors are Neutron Multiplication in Subcritical Spheres, A. Hanson and H. L. Anderson, LA-1033 (12/19/47). ● ☛☛ ● ● ☛☛ 9** ● 0 ●*- ● ● ● * ● :0 :e ● *.* :: ● * ●* ●:0 :00 9** :00 9* A● m d?.-:. :“. ● ● ● .*9 *OO ● ● ::0 ● * ● 8* ● ● 9 APPROVED FOR PUBLIC RELEASE
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APPROVED FOR PUBLIC RELEASE APPROVE
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May 22, 1950 /~. -Group_ w:2——
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ORALLOY HYDRIDE CRITICAL ASSEMBLIES
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Page 15 and 16: %hilm ● 0 ●9: ●:0 ● O9 ..*
Page 17 and 18: 0.4 0.3: ‘?) 0.3C — x Ill 1- 2
Page 19 and 20: Critical Size of . . ● 90 ● *-
Page 21 and 22: 0.45 0.40 0.35 0.30 0.25 0.20 0.15
Page 23 and 24: . Shape Factor As a guide to critic
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Page 33 and 34: APPROVED FOR PUBLIC RELEASE u -31-
Page 35 and 36: ● 90 ::* ● :j~ 9* ● O ● :
Page 37 and 38: 8 IL o E1a m w L (n z 0 10-’( 1(5
Page 39 and 40: ld2- 6 10’3 10’4 Ids CORE I APP
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Page 43 and 44: -;:: ::; ● Om*Om OO** . . ● e
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Page 47 and 48: 9. ● a. . . . ● . . .*9 .m De H
Page 49 and 50: 39 @ u 42 45 46 47 M 49 50 51 52 53
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Page 53 and 54: ● ✚ 98 909 assemblies. (2) (3)
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Page 61 and 62: neutrons with energies changes mono
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