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0bservations are reported on the behavior of several fission product elements in molten NaF- ZrF/sub 4/-UF/sub 4/ fuels, irradiated in capsule experiments, forcedconvection in-pile loop experiments, and in the Aircraft Reactor Experiment (ARE). The rare gases have been observed to escape readily from the fuels in dynamic tests, although in static tests the rate of escape is very low. Rutbenium and niobium deposit on the Iaconel walls of the fuel container. probably as metals. Other fission products studied (Sr, Zr, La, Ce) appear to remain in the fuel. The results obtain are entirely consistent with theoretical productions. It is suggested that the observed noble metal deposit map serve to reduce corrosion of methls by molten floride fuels. The unsatisfactory nature of Cs/sup 137/ as a fission monitor in such fuels is reported. and the use of Zr/sup 95/ substitute is discussed. (auth) l6536 In order to evaluate the irradiation stability of the APPR-1 type Fe-B cored, stainless steel clad control rod configuration, a test program consisting of the irradiation of both minature absorber plates and an APPR-1 type full size control rod was initiated. The purpose of these irradiations was to determine toe dimensional stability and structural integrity of this type of absorber material throughout a relatively wide range of B burnups. Results obtained from the post- irradiational examination are summarized. (W.L.H.)).
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The chemistry of molten fluorides is traced from their development as fuels in the Molten Salt Reactor Experiment with important factors in their selection being discussed. Key chemical characteristics such as solubility, redox behavior, and chemical activity are explained as they relate to the behavior of molten fluoride fuel systems. Fission product behavior is described along with processing experience. Development requirements for fitting the current state of the chemistry to modern nuclear fuel system are described. It is concluded that while much is known about molten fluoride behavior, processing and recycle of the fuel components is a necessary factor if future systems are to be established.
Molten mixtures of fluorides with UF4 as a component have been used as combined fuel and primary heat transfer agent in experimental high-temperature reactors and have been proposed for use in breeders or converters of 233U from thorium. Such use places stringent and diverse demands upon the fluid fuel. A brief review of chemical behavior of molten fluorides is given to show some of their strengths and weaknesses for such service.