Sample records for zpsub 5wsub 30osub

  1. Stabilization/Solidification of radioactive molten salt waste by using xSiO{sub 2}-yAl{sub 2}O{sub 3}-zP{sub 2}O{sub 5} material

    Energy Technology Data Exchange (ETDEWEB)

    Hwan-Seo Park; In-Tae Kim; Yong-Zun Cho; Seong-Won Park; Eung-Ho Kim [Korea Atomic Energy Research Institute: 150 Deokjin-dong, Yuseong, Daejeon, 305-353 (Korea, Republic of)


    Molten salt waste generated from the electro metallurgical process to recover uranium and transuranic elements is considered as one of problematic wastes to be difficult to immobilize into a durable for final disposal. As an alternative, this study suggested a new method performed at molten state, where dechlorination was achieved with a new inorganic material containing SiO{sub 2}, Al{sub 2}O{sub 3} and P{sub 2}O{sub 5} (SAP). The SAP as a reactive material to molten salt was prepared by a conventional sol-gel process. The prepared SAPs were reacted with each metal chloride, LiCl, CsCl, SrCl{sub 2} and CeCl{sub 3} at 650 deg. C for 6 hours and also were reacted with simulated salt waste consisting of 90 wt% LiCl, 6.8 wt% CsCl and 3.2 wt% SrCl{sub 2} at different waste loading. All the reactions were carried out in oxidative atmosphere and metal chlorides were effectively converted into stable products under a reasonable reaction ratio.

  2. Theoretical Studies of Electron Injection and E-Layer Build-Up in Astron; Etudes Theoriques sur l'Injection d'Electrons et la Formation de la Couche E dans l'Astron; Teoreticheskie izucheniya ehlektronnoj inzhektsii i narashchivaniya sloya-E v ustanovke ''Astron''; Estudios Teoricos de Electrones y Formacion de la Capa E en la Instalacion Astron

    Energy Technology Data Exchange (ETDEWEB)

    Killeen, J.; Neil, V. K.; Heckrotte, W. [Lawrence Radiation Laboratory, Livermore, CA (United States)


    High intensity beams of relativistic electrons injected into the Astron device can be trapped in part by the action of coherent electromagnetic self-forces. Through the appropriate design of external passive circuitry, axial electrostatic blow-up of the azimuthally injected beam can be prevented or inhibited. The self-forces result in a spread of particles in z-P{sub z} phase space, and part of the beam is trapped at the expense of the loss of the rest. In addition to this effect, for sufficiently high beam currents, the coupling of the relativistic beam to the passive circuitry can lead to significant loss of axial momentum through energy dissipation. A one-dimensional model of the actual Astron geometry has been investigated theoretically. Green's functions for the self-electric and self-magnetic fields have been calculated analytically and incorporated into the Vlasov equation governing the axial motion of the electrons. Results of the calculation allow some qualitative comparison with experimental results from the Astron experiment. As envisioned, the trapped electrons will form a cylindrical layer of sufficient intensity so that the self-magnetic field is comparable to the applied field. The mathematical model for the build-up of the electron layer and the self-field is the time-dependent Vlasov equation coupled with Maxwell's equations. The system is axially symmetric and complete neutralization is assumed. The field components Br and B{sub z} can be derived from a stream function {psi}( r, z, t). The canonical angular momentum is a constant of the motion, hence we can consider an electron distribution function f{sub e}( r, z, P{sub r}, P{sub z}). The partial differential equations for f{sub e} and {psi} are solved numerically by using finite difference methods. The phase space consists of over 160 000 points, that is 81 in z, 12 in r, 19 in P{sub z} and 9 in P{sub r}. At each step an integration of f{sub e} over momentum space yields the current density j