ORNL-1771 - Oak Ridge National Laboratory

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that will permit remote, momentary flooding of the impeller eye and the labyrinth behind the impeller. A turbine-type impeller is used instead of the conventional centrifugal i mpel ler. It has been experimentally determined, with water, that the turbine type of impeller will prime itself if the inlet and outlet are placed at the bottom of the pump and the fluid is maintained at a level about half way between the bottom of the impeller and the impeller center. The horizontal sump pump principle is used, with the sump having a minimum volume that acts merely as an expansion chamber and a reservoir to replace and catch the fluid leaking past the labyrinth seal. Excessive impeller end clearances are necessary for this type of pump because of the severe temperature gradients present. However, estimated available pump heads (25 ft at 4500 rpm and 1.5 gpm) are greater than the estimated requirements. Hydraulic efficiency of the pump will be low but performance will be reliable. Further work has been done on centrifugally sealed and frozen-fluoride-sealed pumps, and it has been established that the centrifugally sealed pump requirestoo greata volume of fluid for sealing for it to be considered for in-pile use and that the leakage rate of the frozen-fluoride-sealed pump is excessive. However, the centrifugally sealed pump, which will be useful for other applications, has been modified to include a system that makes the pump self-priming and deaerating. By con- trolling the seal level and using a proper venting PERIOD ENDING SEPTEMBER 10, 1954 sequence, the pump can be easily stopped and restarted. A pilot model of the pump, similar to the pump previously described,2 has been designed that incorporates these features (Fig. 3.1) and an integral sump tank connected by a passage to the seal cavity. In Operation, the system would be filled to the full level. The seal cavity and sump tank would then be pressurized through the gas inlet tube to the predetermined pressure necessary to obtain a positive pump inlet pressure during operation, and the pump would be started. The centrifugal force would cause the liquid in the seal cavity to form a rotating annulus. The annulus of fluid would develop a small pressure and thus pump fluid into the discharge tube, through the loop, and back to the pump. The small bleed hole from the pump discharge to the sump tank would permit deaeration by bypassing aerated fluid from the pump into the sump. The bypassed fluid would be replaced by clear fluid from the seal. When the pump was primed and deaerated, a continuous flow of fluid would pass from the bleed hole to the sump to remove any accumulation of gas. Throughout this operation, fluid entering the loop from the seal to either fill the loop or replace the bleed flow would be replaced by fluid from the sump, and sufficient fluid would thus be in the seal for sealing. There- fore there is a lower limit on the run level in the 35
ANP QUARTERLY PROGRESS REPORT 36 PRFSS JRlZlNG GAS _INE LIQUID LEVEL ~ i I VOLUME REDUCING ANTlFLOWaACK SEAL IMPFL LFR VANE' , -ROTARY SEAL UNION Fig, 3.2. Vertical-Shaft Centrifugal Sump Bump (Model LFB), SPARK PLUG PROBE ~ ~ UNCLASSIFIED <strong>ORNL</strong>-LR-DWG 3095 -3 c -\" II] N
Page 2 and 3: Contract No. W-7405-eng-26 AIRCRAFT
Page 4 and 5: 1. G. M. Adamson 2. R. G. Affel 3.
Page 6 and 7: 197-198. Powerplant Laboratory (WAD
Page 8: FOREWORD This quarterly progress re
Page 11 and 12: PART II . MATERIALS RESEARCH 5 . CH
Page 13 and 14: Remote Metallography ..............
Page 15 and 16: ANP QUARTERLY PROGRE.S.5 REPORT ver
Page 17 and 18: AMP QUARTERLY PROGRESS REPORT A dev
Page 20: part I REACTOR THEORY, COMPONENT DE
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Page 27 and 28: ANP QUARTERLY PROGRESS REPORT 67 g
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Page 33 and 34: ANP QUARTERLY PROGRESS REPORT TABLE
Page 35 and 36: ANP QUARTERLY PROGRESS REPORT - 22
Page 37 and 38: in the ZPU system, While this arran
Page 40 and 41: I ORNL-LR-DWG 3092 CALCULATIONS EXT
Page 42 and 43: Power level TABLE 2.6. COMPARISON O
Page 44 and 45: PERIOD ENDING SEPTEMBER JO, 1954 Fi
Page 46 and 47: I R j I Fig. 2.7. Surfaces of Beryl
Page 50 and 51: sump in that it must be sufficientl
Page 52 and 53: J Fig, 3.4. Inconel Forced-Circulat
Page 54 and 55: - PERIOD ENDING SEPTEMBER 10, 1954
Page 56 and 57: from 18 to 31 so that tests of long
Page 58 and 59: A A Fig. 4.1. First Reflector-Moder
Page 60 and 61: - 40 32 c 3 24 A F! P ._r >- k > ir
Page 62 and 63: with and without 0.OZin.-thick cadm
Page 64: Part II MATERIALS RESEARCH
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ANP QUARTERLY PROGRESS REKIRT TABLE
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ANP QUARTERLY PROGRESS REPORT TABLE
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ANP QUARTERLY PROGRESS REPORi Fig.
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ANP QUARTERLY PROGRESS REPORT Ceram
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A N P Q UA R I-EKIY PRO G R ESS R E
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ANP QUARTERLY PROGRESS REPOR7 Effec
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ANP QUARTERLY PROGRESS REPORT Fig.
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ANP QUARTERLY PROGRfSS REPORT Flamm
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AMP QUARTERLY PROGRESS REPORT of tw
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ANP QUARTERLY PROGRESS REPORT The e
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ANP QUARTERLY PROGRESS REPOR7 trans
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AM? QUARTERLY PROGRESS REPORT at pr
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AMP QUARTERLY PROGRESS REPORT studi
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ANP QUARTERLY PROGRESS REPORT The m
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ANP QUARTfRLY PROGHESS REPORT As be
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ANP QUARTERLY PROGRESS REPORr Devel
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ANP QUARTERLY PROGRESS REPORT UNCL
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ANP QUARTERLY PROGRESS REPORi UNCLA
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ANP QUARTERLY PROGRESS REPORT lncon
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ANP QUARTERLY PROGRESS R€PORT 450
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132 ANP
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ANP QUr4RTERLY PROGRESS REPORT Addi
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ANP QUARTERLY PROGRESS REPORT mater
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ANP QUARTERLY PROGRESS REPORT 138 (
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ANP QUARTERLY PROGRESS REPORT The c
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ANP QUARTERLY PROGRESS REPORT oxide
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ANP QUARTERLY PROGRESS REPORT - n 6
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ANP QUARTERLY PROGRESS REPORT 10. A
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ANP QUARTERLY PROGRESS REPORT Oxide
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ANP QUARTERLY PROGRESS REPORT and U
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zirconium or aluminum complex, or l
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11. SHIELDING ANALYSIS J. E. Faulkn
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form in terms of the Spence functio
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these integral 5 become Let and the
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PERIOD ENDING SEPTEMBER IO, 7954 Al
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0 20 40 60 80 IO0 120 140 160 I, Di
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... Two configurations, a single du
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The thermal-neutron flux (Fig. 13.2
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E-7 1 O6 I 5 - - L I ___- 2 f o5 2
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TIME (rnin) PERIOD ENDING SEPTEMBER
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. - ., . ....._____... - PERiOD END
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io3 5 .--w 2 _J U 0 0 >- " 2 2 40 t
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PERIOD ENDING SEPTEMBER 10, 1954 Fi
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part IV APPENDIX
Page 197:
REPORT NO. ~~-54-a-10 C F-54-6-4 CF
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