Abstract
the lateral pressure of the mixtures is given in graphical form. HRT pump development is discussed. Analytical results of HRT heat exchanger cleaning are given. The flowsheet of the mockup in its present state is shown. Data are given from chemical analyses of HRT mockup fuel during gas- and steam- pressurization runs. Pressure rises following stoppage of heat removal in the HRT are shown for various discharge rates. With no fluid discharge the pressure would reach 2800 psia in 35 sec. and continue 10 rise until some safety device was actuated. The pressure-time relation during an HRT dump was calculated for various combinations of heat generation, heat removal, and venting conditions, and complete results are given. Two prototype pressurizer-level controllers, incorporating hydraulic and magnetic damping systems, are shown. A prolotype model of the dump-valve operator is shown and was cycled 20,000 times without failure. Plans for the HRT fuel processing building are shown and discussed. The predicted solids production in the HRT is tabulated. More detailed descriptions are given of the fuel processing systems, such as the high-pressure system, the underflow pot cooling system, the low-pressure system, the off-gas disposal system, the U recovery system, and the fuel addition system. Diagrams of the various systems are given, and data are included on the two-liquidphase region of UO/sub 2/S)/sub 4/, solids concentration in circulating reactor fuel as a function of hydroclone operating time, temperatures of the underflow-pot system during a heating cycle, and the rate of decomposition of D/sub 2/ in the evaporator decay tank. Reactor Design and Analysis. A study of fuel costs was made for power-only reactor systems fueled by UO/sub 2/SO/sub 4/- Li/sub 2/SO/sub 4/-D/sub 2/O solut ions. The effects of U concentration and diameter on fuel cost are shown. The optimum U concentration was about 200 g/liter, and the optimum diameter is approximately l4 ft. Results for several reactors near optimum conditions are listed. Critical concentrations and breeding ratios were calculated for a series of D/sub 2/-moderated Th breeder reactors, and results are given in graphical form. Reactivity changes associated with slurry settling in the TBR are given. Engineering Development. Model III of the highpressure recombiner loop is shown. Other recombiner developments are discussed. The attack of circulating aqueous ThO/sub 2/ slurries on stainless steel systems was studied, and results are tabulated. The use of Westinghouse slurry pump 200A is discussed. Designs are shown for a conical dump tank with a vertical gas lift. Corrosion and Materials. Corrosion in pumploops and toroids is discussed. Thorium oxide slurry corrosion of pump loops is also discussed. Comparative corrosion rates of various materials by circulatingthorium oxide slurry at 300 deg C are tabulated. In-pile loops for radiation corrosion tests are described. Investigations of the effect of radiation on the corrosion of Zircaloy-2 and type 347 stainless steelware continued, and complete results are tabulated. Data on the corrosion of stainless steel at 260 deg C in UO/sub 2/SO/sub 4/ solution are also given. Metallographic examination of several specimens have been made to provide information on basic mechanisms in the Zr-H system. The structure of
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