The compound RbU/sub 6/F/sub 25/ has a hexagonal crystal structure with the parameters a/sub o/ = 8.195 plus or minus 0.002 A and c/sub o/ = 16.437 plus or minus 0.002 A. This compound is believed to be isomorphous to KU/sub 6/F/sub 25/ and KTh/sub 6/F/sub 25/. (auth) uranium hexafluoride -chlorine trifluoride -hydrogen fluoride from a knowledge of the behavior of the three binary systems. The conditions under which chlorine trifluoride and hydrogen fluoride could be removed from uranium hexafluoride by fractional distillation are discussed. (auth)

An estimate is presented which is intended to establish an expected order of magnitude of resulting thermal neutron-induced activity and relative production of stable and radioactive isotopes in soil. The estimate is based on a one MT weapon (100%) fusion detonated at the surface of Nevada Test Site soil. (W.D.M.)

Fission products, which may leak from the fuel and activated corrosion products from stainless steel surfaces, influence the design of several systems which support the main coolant system. Since the radioactivity in the main coolant resulting from these impurities must be limited to reasonable levels during operation, a purification system becomes important. Air conditioning of the vapor container as a result of possible main coolant leakage may be necessary during and after operation to remove airborne activity. After shutdown, treatment and disposal of active effluents becomes the function of a waste disposal system. Activities are tabulated, by individual isotopes, for 10,000 hours of full power operation. (auth)

In a process for the preparation of dense, metalgrade UF/sub 4/, the sulfuric acid solution of uranium prepared either from ore of concentrate is treated with a kerosene solution of an amine, the uranium extracted, then stripped from the solvent into hydrochloric acid. Hydrofluoric acid and cupric sulfate are added to the pregnant strip solution and UF/sub 4/ precipitated by bubbling SO/sub 2/ through the hot solution. (J.R.D.) 12340 Equilibrium diagrams for the b- ary systems UF/sub 4/ZrF/sub 4/ and NaF-- ZrF/sub 4/ and the ternary system NaF-ZrF/sub 4/--UF/sub 4/ described in this paper are based on data obtained by thermal analysis differential thermal analysis, equilibration of small samples followed by queuching, visual observations of phase changes and (((((((((Abstract unscannable))))))))))))

The hazards associnted with the use of magnesium capsules in a CO/sub 2/- cooled reactor system have been analyzed, and consideration has been given to incidents which could lead to excessive temperature excursions and factors which could significantly reduce the ignition temperature of magnesium alloys. Methods of reducing the hazards associated with the Calder Hall type of reactor are discussed, and an experimental approach with which to define more aaccurately conditions that would lead to ignition is suggested. (auth)

Information concerning diffusion is presented, including a study of the relative rates of diffusion of Fe/sup 55/ and Fe/sup 59/ in Ag, diffusion of Ru in Ag, self-diffusion in AgCd and AgIn. chemical and tracer diffusion in Ag-alpha AgCd diffusion couples, the influence of pressure on diffusion in AgZn alloys, the energy of motion of vacancies in Au at high pressure, and ionic conductivity of alkali halides as a function of pressure and temperature. A list of publications containing diffusion information is also included. (J.R.D.)

This report describes the operation of the fuels preparation department for the month of April 1958. Manufacturing, employee relations, process development, plant improvements, and financial operations are described.