摘要:

AbstractThe streaming potential technique has been used to obtain the zeta potentials of ThO2in HCl, HI, HNO3, and H2SO4of various concentrations. The data are correlated with observed settling rates and tendency toward ThO2colloid formation. Streaming current measurements were made on type 304 stainless steel samples. Evidence is presented to demonstrate the significance of the zeta potentials of the ThO2and the stainless steel in the formation of thin films and thick cakes of ThO2on the stainless steel.

ISSN:0029-5639    

DOI:10.13182/NSE59-A25572

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

摘要:

AbstractA method for evaluating a bank of slab-type control rods in enriched hydrogenous reactors considering both thermal and epithermal capture has been developed within the framework of three neutron energy groups. An absorption area technique that combines diffusion theory in the fuel moderator region and a transport condition at the control rod boundary is utilized. The effect of the absorption area is to decrease the source strength for the thermal and epithermal energy groups. The epithermal transmission probability for a non-1/υabsorber is found by an experimental reactivity comparison to a 1/υabsorber. Assuming that the absorption area is uniformly distributed throughout the core, a hand calculation can be made which determines the number, size, and composition of rods necessary to achieve a specific cold shutdown margin.

ISSN:0029-5639    

DOI:10.13182/NSE59-A25573

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

摘要:

AbstractComputed disintegration rates and numbers of atoms (abundances) of each fission product radionuclide at various times after simultaneous slow neutron fission of 10,000 atoms of U235are presented. These results are based on fission yields from two different theories of independent fission yields. The computations treat both known and unknown fission product radionuclides. Half-lives and yields of the latter were estimated. The disintegration rate, number of active and inactive atoms, total number of atoms, and the percentage contribution to total activity and to the total number of atoms are presented for each element and for each chemical group of elements. The disintegration rate of the total fission product mixture according to each independent yield theory is also presented.

ISSN:0029-5639    

DOI:10.13182/NSE59-A25574

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

摘要:

AbstractFrom the time dependent heat conduction and temperature distribution, an expression is derived for the time constant in a cylindrical fuel pin and cladding with axial coolant flow. The power production and the inlet temperature are functions of time. In the radial direction perfect mixing of the coolant is assumed. The average coolant temperature in a region is the average between inlet and outlet temperature assuming a linear rise in the axial direction. The set of partial differential equations can be solved by means of Laplace transform. The reciprocal of the roots of the characteristic equation for the temperature in the transform domain represents the time constants. The smallest root represents the dominant transient time constant. This dominant time constant is compared with a qualitative expression for the thermal relaxation time of a reactor after a power change given by Bethe. The numerical example used is a fuel pin in EBR-I Mark III in flowing NaK coolant at a core power generation of 1 Mw at various coolant flow conditions.

ISSN:0029-5639    

DOI:10.13182/NSE59-A25575

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

摘要:

AbstractA continuously varying distribution of fissile material being difficult to realize in a minimum critical mass reactor, restricted distributions varying by steps are investigated in the particular case of“spherical”symmetry. It is shown that the crossing points of the restricted distribution with the unrestricted one are asymptotically distributed like the zeros of the orthogonal polynomials associated with the unrestricted distribution, as weight function. The differences between the minimum masses in the restricted and unrestricted cases are decreasing faster than 4−p, wherepstands for the number of steps of different heights. Other asymptotic properties are examined.

ISSN:0029-5639    

DOI:10.13182/NSE59-A25576

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

摘要:

AbstractThe elastic moduli of polycrystalline uranium are calculated from the single crystal data, and are compared with the measured values. The discrepancies between data measured at different laboratories are also discussed.

ISSN:0029-5639    

DOI:10.13182/NSE59-A25577

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

ISSN:0029-5639    

DOI:10.13182/NSE59-A25578

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

ISSN:0029-5639    

DOI:10.13182/NSE59-A25579

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

ISSN:0029-5639    

DOI:10.13182/NSE59-A25580

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor

ISSN:0029-5639    

DOI:10.13182/NSE59-A25581

出版商:Taylor&Francis    

年代:1959

数据来源: Taylor