Accession Number : AD0636437

Title :   PARAMETRIC ANALYSIS OF THE NUCLEAR CHARACTERISTICS OF A BOILING WATER VORTEX REACTOR.

Descriptive Note : Master's thesis (technical memo).

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Lipps,Alton J. , Jr

Report Date : 21 JUN 1966

Pagination or Media Count : 51

Abstract : The effects of physical property changes on the nuclear characteristics of a boiling water vortex reactor have been investigated. The vortex reactor consisted of a central cylinder of steam surrounded by concentric cylindrical annuli of an inner reflector, a core, and an outer reflector. The reactor was fueled with uraniumzirconium hydride, cooled by boiling light water, and reflected by light water. The fuel was considered to be either in fixed rods or plates or in fluidized pellets. The parameter changes were evaluated using three computer codes: the TWENTY GRAND code was used to solve the two-dimensional neutron diffusion equation; the STACS code was used to generate thermal group cross sections; and the FORM code was used to generate fast group cross sections. Two desirable characteristics of the vortex reactor are: the reactor would not depend on gravity for steam separation; and the reactor would be self regulating due to the negative void coefficient. A vortex reactor using fixed fuel elements did not exhibit any large positive reactivity changes due to changes in the geometry and composition, with the exception of a large insertion of positive reactivity, about 6 percent, which occurred when cold water filled the reactor. Since this reactivity can be controlled, a reactor using fixed fuel elements is feasible. The positive reactivity changes possible with a vortex reactor using pellet fuel was much greater than that of the fixed fuel type. (Author)

Descriptors :   (*BOILING WATER REACTORS, *REACTOR LATTICE PARAMETERS), PHYSICAL PROPERTIES, REACTOR THEORY, COMPUTER PROGRAMMING, NUCLEAR POWER PLANTS

Subject Categories : Nuclear Power Plants and Fission Reactor Eng
      Nuclear Fission Reactors(non-power)

Distribution Statement : APPROVED FOR PUBLIC RELEASE