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ANP QUARTERLY PROGRESS REPORT turbulent liquid metals under high temperature differentials has been completed, and components have been fabricated. The first series of tests will include combinations of lnconel and type 316 stainless steel as loop materials, with sodium as the circulated liquid metal. NaturaLGas Heat Sources for Forced-Circulation Loops were made in order to obtain preliminary data for design of a natural-gas heat source for forced-circulation corrosion test loops. It was found that exhaust gas temperatures of between 2800 and 330OoF could be obtained without initial air preheating, and, by using air at a rate of 65 to 650 cfm, the equivalent of 100 to 1000 kw of heat was released. Maximum system thermal efficiencies of 20 to 60% appear to be feasible. Tests with electric-resistance heated units indi- cate a maximum wall temperature of 175OOF with the tubing lengths required by pressure-drop and flow considerations. Somewhat higher tube-wall external element temperatures or proportionately longer heater sections would be required with gas heating. An economic study indicates that there is little choice between providing electrical power supplies and providing large-capacity air supplies for gas heating. Therefore, since development of a gas-heated unit specifically for this purpose would be expensive and since there is no present proof of reliability of components and operation of gas-fired loops, further study of gas firing for these test loops appears to be unwarranted. HEAT EXCHANGER DEVELOPMENT ’ Heat Exchanger Tests R. E. MacPherson Aircraft Reactor Engineering Division R. D. Peak Pratt & Whitney Aircraft A number of tests of fused salt-to-NaK heat exchangers are to be made for determining the fabr icabi I ity, operab i I ity, operating parameters, and reliability of heat exchanger tube bundles such as those proposed for the ART. The test 46 s are to include reliable pumps, reliable heat sources, and adequate heat sinks. A preliminary heat exchanger test reported previ- ously5 indicated reasonable structural integrity of the exchanger (1682 hr of operation), but little data on operating parameters were obtained. For the next experiment, a regenerative system is to be used in which the heat exchanger will be an economizer that will transfer about 4 Mw of heat, while a heat input and release of only 1 Mw will Header Leak Test R. E. MacPherson Aircraft Reactor Engineering Division R. D. Peak Pratt & Whitney Aircraft It has been postulated that small leaks which develop in metal walls separating NaK and fluo- ride fuels may be self-plugging as the result of the precipitation of high-melting-point react ion products. A program of tests is currently under i.” way to check this possibility. To date, one test has been run, which indicates that self-plugging - can occur with NaF-ZrF,-UF, fuels. The leaks are installed between three cells as shown in Fig. 3.5. The center cell is pressurized to leak into the end cells under the pressure differentials shown, 5 and 50 psi. The test rig was filled with NaF-ZrF,-UF, fuel in the center cell and NaK in the end cells. The leaks were about 0.002 in. in diameter. After 12 hr at 13OO0F, there was no apparent leakage, and x-ray pictures taken at intervals during the test showed no changes in liquid levels. Pump for Heat Exchanger Tests W. G. Cobb W. R. Huntley A. G. Grindell R. E. MacPherson Aircraft Reactor Engineering Division A series of tests is being made in order to determine whether an existing model DANA pump (ARE moderator-coolant-type sump pump) is suitable for the high-speed operation which will be required in the intermediate heat exchanger test loop. Critical shaft-speed determinations made by K-25 personnel indicated that the pump could be operated safely at the proposed speed of approximately 3700 rpm. 5A. P. Fraas, R. W. Bussard, and R. E. MacPherson, ANP Quar. Prog. Rep. June 10, 1954, ORNL-1729, p 22. * - 8 . -
. . . . .- . Fig. 3.5. Heat Exchanger Header Leak Test. PERIOD ENDING DECEMBER 70, 7954 ,. . . , Two approaches have been investigated experi- system became limited by gas flow because of mentally, and the best features of both are to be high pressure drops on the gas-supply system at 47
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