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1 1. CORlROS ION RESEARCH PERIOD ENDING DECEMBER 20, W. R. Grises, Materials Chemistry Division Most of the effort on corrosion was expended in dynamic tests of the ZrF4- bearing fluoride me1 ts. These s tudies have been primarily concerned with the effect of various additives to the melt on the corrosion behavior of Inconel. It was found that additions of ZrH, and NaK to the fuel mixture inhibit the corrosive attack. Other tests of fluoride corrosion have been performed to determine the effect of crevices, temperature, and pretreatment of the fluoride and the resistance of various oxide coatings and ceramic bodies. Several Tnconel loops circulating the fuel mixture NaF-ZrF4 -UF, (46-50-4 mole %)exhibited more severe corrosion than was previously encountered in such tests; this is believed to be due to the lower purity of the fluoride mixtures recently prepared in large- batch apparatus. Temperature-dependence tests and experiments on the effects of various additions on the corrosion behavior of the hydroxides were carried out. How- ever, the maintenance of a hydrogen atmosphere is the only proved means of controlling hydroxide corrosion. The work on liquid metal corrosion was concentrated on the operation of thermal convection loops of two types to study the mass transfer properties of lead. One of the most critical variables in lead corrosion was found to be the cleanliness of the lead and the container. However, even the purest lead prepared to date cannot be satisfactorily contained in Inconel at temperatures above 500°C. The in- vestigation of the stability of Be0 in NaK was continued, but additional ex- perimentation is required to make an e va 1 ua t ion, W. D. Manly, Metallurgy Division W. W, Savage, ANP Division FLUORIDE CORROSION IN STATIC AND SEESAW TESTS D. C, Vreefand L. R. Trotter E. E. Hoffman J. E. Pope Metallurgy Division F. Kertesz C. R. Craft H, J. Buttram R. E. Meadows Materials Chemistry Division 1952 Oxide Additives. Static tests were run in Inconel tubes €or PO0 hr at 816°C with the fluoride mixture NaF-KF-LiF-UF4 (10.9-43.5- 44.5- 1.1 mole X) plus approximately 10%additions of ferric oxide, nickel oxide, and chromic oxide. These tests were run to determine whether the presence of these oxides, which may also be present on Inconel, would increase the corrosion by fluorides. In these tests, the nickel oxide and ferric oxide had little or no effect on the extent of corrosion. The addition of chromic oxide apparently increased corrosion. The results are summarized in Table 11.1. Similar tests are being run with oxidized Tnconel specimens to determine whether increased corrosion can be expected on oxidized Tnconel. Comparison of Liquid- and Vapor- Phase Corrosion. Sections of the testing tube used in some of the tests run with the fluoride mixture NaF-KF- LiF-UF, (10.9-43.5-44.5-1.1 mole %) for 100 hr at 816°C were removed, both from above and from below the bath level, for metallographic examination. The corrosive attack noted on all sections examined would seem to indi- cate that attack can be expected on metals exposed to the vapor phase of the fluoride mixture. The sections of type 304 stainless steel exposed to the vapor phase appeared to be attacked 127
ANP PROJECT QUARTERLY PROGRESS REPORT more severely than those exposed to the liquid phase. Inconel, type 309 stainless steel, and type 316 stainless steel appeared to be attacked by the vapor phase to approximately the same extent as by the liquid phase of the molten fluoride salt. Figures 11.1 and 11.2 compare type 304 stainless steel as exposed to the liquid phase and to the vapor phase of the fluoride. Details of these tests are presented in Table 11.2. Crevice Corrosion. Some concern had been expressed about the possibility of crevice corrosion in materials used to contain the molten fluorides. In order to check this possibility, tests were set up with specially prepared crevices. Ordinary static corrosion tubes were employed, and the lower section of the tube above the bottom ___ Erratic attack, subsurface voids to 1.5 mils Er re t i c attack ~ inter gr anu 1 ar with some subsurface voids to 1 mil Subsuriace voids to 3 mils Intergranular penetration of 1 mil weld was partly crimped so that a crevice about 1 in. long and approximately 1/16 in. wide was obtained. After being exposed for 100 hr at 816°C to the fluoride mixture NaF-KF- LiF-UF, (10.9-43.5-44.5-1.1 mole %I, the tubes were cut longitudinally through the partly crimped section and examined for evidence of accelerated corrosion. The crimped ends of several ordinary static corrosion test tubes were also examined for accelerated corrosion. Corrosion in these crevices appeared to be somewhat erratic, with some sections being unattacked. How- ever, even in the sections that were attacked, the depth of penetration did not exceed that normally expected for these materials after exposure to fluorides. Details of these tests are presented in Table 11.3. TABLE 11.1. RESULTS OF STATIC CORROSION TESTS OP INCONEL IN NaF-KF-LiF-UF, WITH VARIOUS ADDITIVES FOR 1100 hr AT 8lfiOC ____ ... .ADDITIVE 10% ferric oxide 10% nickel oxide 10% chromic oxide ........ __._I__ METALLOGRAPHIC NOTES -_....___ . Attack to 2 mils on specimen and tube Attack to 1 m il on specimen and tube Attack to 5 mils on specimen and 2 to 10 mils on tube TABLE 11.2. RESULTS OF EXAMINATIONS OF VARIOUS MATERIALS EXPOSED TO LIQUID AND VAPOR PHASES OF NaF-KF-LiF-UF, FOR 100 hr at 816OC hIATERIA1. In cone I Type 304 stainless steel Type 309 stainless steel Type 316 s tainl ess s tee1 ..- .. .... .... ________._ ....._______ ...______ ..-. ..-. . METALLOGRAPHIC NOTES ...______ ....... LIQUID- PHASE EWOSURE 7""'vaPm- PHASE EXPOSURE Erratic attack, subsurface voids to 1 mil Intergranular attack to 5 mils Subsurface voids to 3 mils _.I- Some slight evidence of attack, Jess than 0.5 mil penetration
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98- 108. 109. 110- 117. 118. 119-12
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Reports previously issued in this s
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e e e PAGE Moore Nullmatic pressure
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.. CrF. .Na. CrFd .Li. CrF6 .......
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PAGE Melting point of 60% Pd-40% Ni
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ANP PROJECT QUARTERLY PROGRESS REPO
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AYP PROJECT QUARTERLY PROGRESS REPO
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in the hot condition corresponds to
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c-' w FILL TANKS LINE VOLUME APPROX
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the disintegration rates and energi
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2. EXPERIMENTAL REACTOR ENGINEERING
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design of the first combination sea
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the construction of the shaft and r
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on packed seals for pumps and valve
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filling, fluoride leakage occurred
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for 1975 hr at 1500nF.~5) The first
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MASS VELOCITY ( Ib/hr .ft2) - PEXIO
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28C - 240 m W w IT e3 w D z 0 I- CJ
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These conditions were maintained fo
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3. GENERAL DESIGN STUDIES A. P. Fra
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- 8 e 90 85 80 75 rn- 7;) u) w z W
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0 03 06 - PERIOD ENDING DECEMBER 10
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In the theory of power oscillations
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J O dt C’ Again, because of the p
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and The assumed boundary conditions
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where N, = number of atoms per cubi
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4 5 6 7 a 9 10 11 12 13 14 15 16 17
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MSTANCE FROM REACTOR AXIS (in) Pmrm
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z 11 t- o a LT LL 1 .O 0.8 5 0.6 -
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300 250 >- I- 2 & 150 ct W LL 50 0
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T BLE 5. RADIAL PmITxm- (in. 1 REAC
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64 ANP PROJECT QUAMTEREY PROGRESS R
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AN€' PROJECT QUARTERLY PROGRESS R
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68 ANP PROJECT QUARTERLY PROGRESS R
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- *0° 1 BO 440 120 , '0° i 80 , I
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Page 110 and 111: Design of the tower configuration a
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Page 114: person received about four times th
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ANP PRQJECT QUAMTERLY PWOd;l"aESS R
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on air radiations and simulated fla
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184 Fie. 13.6. Pyrex Thermal Convec
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ANP PROJECT QU.4RTEtlLY I'ROGRESS R
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SUMMARY AND INTRODUCTION The list o
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CF-52-11-85 ORNL- 1 43 3 OWL- 137 2
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H. Seal and Pump Development PERIOD
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12. 13. 14. 15. 16. 1.7. 18. 19. Pr
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i 3. U0,-NaOH Slurry Loop 4. Operat
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7. Fuel Spherical Particle Producti
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