[en] Based on the conformal mapping, Green function method was applied in hexagonal geometry. Conformal mapping was used to map a hexagonal node to a rectangular node before transverse integration. Then, the transverse integration equations were resolved using Green function method with the second boundary condition. A three dimensional multi-energy-groups static program NACK was programmed based on those theories. The code was verified by VVER-1000-type core without the reflector, VVER 440-type three-dimensional two-energy-groups core and two-dimensional core with discontinuity factors. The eigenvalue error is less than 50 pcm, and the maximum relative error of the node average power is less than 2%. The accuracy of NACK is as good as that of other advanced node method codes. (authors)

[en] Based upon traditional PSA methodology used in full power condition and the features of NPPs (nuclear power plants) at shutdown operation, a specific approach to conduct shutdown PSA practically and feasibly is proposed. This Approach includes mainly discretization of POSs (plant operation states), phased evaluation and master plant logical fault tree. This feature approach is applied in shutdown PSA for GNPP, and some results and suggestions, which reflect the realistic situation of GNPP, are obtained. These recommendations and conclusions are of practical value to shutdown operation at GNPP and they are also of great significance for design, operation and management for other domestic NPPs

[en] Using microscopic sdgIBM-F-bar_max approach and procedure of canonical ensemble average, the finite temperature specific heat capacity of ²⁰Ne is calculated. As there are peaks in the specific heat capacity, it is established that phase transition of thermal excitation mode is taken place. The order parameter of this phase transition is supposed to be boson energy

[en] Measurements of neutron cross-section for ¹⁷⁶Hf(n,2n)¹⁷⁵Hf and ¹⁸⁵Re(n,2n)¹⁸⁴Re^m,g reactions are reported. In the experiment, the D(d,n)³He and T(d,n)⁴He reactions are used as the neutron sources, neutron energy ranged from 10∼12 MeV, about 14 MeV and 18 MeV. The neutron fluence is monitored by the ⁹³Nb(n,2n)⁹²Nb^m reaction. Details of this experiment are described and the results are compared with ENDF/B-6, JEF-2, JENDL-3, ADL-3 and the data from literature

[en] Tritium release behavior of breeder γ-LiAlO₂ is studied with out-of-pile experiments. According to measuring curves, diffusivity is calculated from 748 K to 873 K, D₀ = (1.39 +- 0.10) x 10^-9 m²·s^-1, Q = (145 +- 3) kJ·mol^-1

[en] Up to 3.8 times enhancement of magnetic critical current density has been observed for boron-doped melt-textured growth superconductors YB_xBa₂Cu₃O_y ( x = 0.015, 0.035) irradiated with thermal neutron fluences of 5 x 10¹⁷ cm^-2. According to the nuclear reaction ¹⁰B(n,α)⁷Li, ⁷Li*(Q=+2.79 MeV), the energetic reaction-produced charged particles α and ⁷Li or ⁷Li* can create uniformly distributed radiation damage as magnetic flux pinning centers. The short life and small dose of the radioactive by-products of the thermal neutron irradiation make this technique quite feasible for practical applications

[en] The method of determination of U in ²³⁵U slag by X-ray-fluorescence (XRF) analysis is developed. U in acidolysis solution and dregs of ²³⁵U slag are determined by thin sample technique and standard added method. The total U in slag is given. The results of XRF are agree well with those obtained from FIA and high performance liquid chromatography (HPLC). The results are compared with two non-destructive assay (NDA) methods, the calibration data are provided to DNA

[en] A new method to prepare ZrO₂ coating with high refractive index from inorganic precursor (ZrOCl₂·8H₂O) is reported. ZrO₂ sol with particle size from several to tens nanometer is prepared by hydro-thermal process. The water in the sol is then replaced with methoxyethanol by distillation. The ZrO₂ coatings are prepared with spin coating method. The surface micro morphology of the film are detected by atom force microscope and α-step apparatus. The infrared transmittance spectra of the films are also obtained. The film thickness and refractive index are measured by ellipsometers, and their relationship with the temperature of thermal treatment is investigated. The influences of the incorporating organic binder PVP (polyvinyl pyrrolidone) on the refractive index and the scratch resistance of the film are also discussed briefly

[en] A new type deposition method which is based on a vibrational motion of microparticles in electrostatic field between parallel electrodes is described. Self-supporting targets and targets on backings with mass thickness between 0.01 and 1.3 mg·cm^-2 from 21 different elements have been prepared by the method. The target uniformity measured by the α thickness gauge is better than 96%

[en] For the sources of negative ions by cesium sputtering (SNICS) in the tandem accelerator to produce negative deuterium ions, a titanium-deuteride cathode is prepared. It consists of a copper cylinder as the cathode base filled with titanium-deuteride powder in the cavity of the cathode base as a sputter target material. Titanium powder is vacuum-treated at a proper temperature to obtain high chemical activity. Then the titanium powder can react easily with deuterium and become deuteride of titanium with 1.5 of atomic ratio of deuterium to titanium. With the prepared titanium-deuteride cathode, the ion source can produce several μA to more than 10 μA of negative deuterium ions in the tandem accelerator