[en] The training module of radiation reconnaissance is designed by adopting the simulated method that 'to input parameter of nuclear explosion and to produce radiation field by computer and to realize lively by GPS'. This module is small size and low power and the training effect is vivid. It is easy to convenient with others radiation meters and the quality and benefit of the training is improved. (authors)

[en] This paper introduced the measurement of natural boron isotope abundance ratio detecting of BO₂^- by mass spectrometry. The uncertainty of measurement result was cut down by the work of selecting emit reagent, deducting the contribution of oxygenium and adjusting the mass fractionation effect. (authors)

[en] This paper introduces the strict quality control in the measurement of reactor fuel burnup in NPIC, in terms of personnel training, improvement and optimization of test scheme, selection and accurate measurement of reagents, and monitor and control of environment radiation. It mainly addresses the following aspects: full implementation of management program, use of advanced test and experiment methods, reduce of personnel radiation dose and uncertainty in measured results, increasing the speed and efficiency for sample separation, and thus ensuring the quality in burnup measurement. (authors)

[en] This paper introduces the direct determination of boron isotope ratios in the boron carbide powder by thermal ionization mass spectrometry. The technique for sample loading, the procedure for heating and the eliminating of effects induced by oxygen are studied. The study indicates that the preparing process for the sample will be shorted, and the time for determination and the exposure dose of the laboratory assistant will be reduced for the reason of directly determination of boron carbide. (authors)

[en] We established a analytical method for determining isotope ratios of molybdenum by negative thermal ionization mass spectrometry (NTIMS). A double rhenium filament technique was employed for sample evaporation and ionization. A solution containing Sr(NO_3)_2 was loaded onto the evaporation filament to depress the work function of rhenium, thus enhancing the yield of negative ions. The technique is optimized for the determination of Mo down to 1 μg, which still secure stable and lasting signals of MoO_3"-. The precision of 0.02%-0.17% (RSD) is accomplished with samples of 1 μg Mo about measurement time of 10-15 min. (authors)

[en] A method of the determination of B in B₄C by thermal ionization mass spectrometry which is achieved by studying and ameliorating sample loading, heating program and the contribution of Oxygenium has been introduced. This method has projected the flow of sample's advance chemical disposal, short cut the time taken by determination, and it meets the requirements of engineer application. (authors)

[en] The basic principle of the magnetic axis measurement on the magnetic field of the solenoid magnet for BES, the measuring method as well as the results are discussed

[en] The depressurization process of supercritical water has a significant influence on the safety of SCWR. The paper carried out the experimental study of the top and bottom vented blowdown processes of supercritical freon (R134a). The investigation focuses on pressure and temperature transients. The effect of initial fluid conditions, orifice diameter on depressurization behavior was experimentally analyzed. During the isentropic change, it is observed that the pressure at which two phases appear depends mainly on the initial fluid condition and depressurization mass flow rate. There is almost no axial temperature gradient during the isentropic process (authors)

[en] The heat transfer at supercritical pressure is mainly characterized by the thermo-physical properties which vary strongly near the vicinity of pseudo-critical point. The strong variation of density leads to great buoyancy effect at low flow rate, which imposes great influence on supercritical fluid flow and heat transfer. The convection heat transfer deterioration of supercritical water in 10 mm vertical tube was studied, and an improved low Reynolds turbulent model was proposed in numerical study to analyze the heat transfer deterioration phenomenon. The calculation results of supercritical fluid heat transfer show that traditional turbulence models overestimate wall temperature, but the present model can predict wall temperature correctly. The numerical results also show the buoyancy effect on turbulent shear stress and flow velocity distribution, which leads to heat transfer deterioration and recovery. (authors)

[en] Seven kinds of Zr-Cu-Cr alloy samples were prepared by using crystalline zirconium as the base material, through normalized processing and annealing at 600℃/5 h. The corrosion tests were carried out in static autoclave with different water chemistry conditions, and the microstructures of alloys were studied by using EBSD, SEM and TEM to investigate the effects of Cu and Cr interaction on the microstructure and corrosion resistance of zirconium alloys. The results show that the addition of Cu element refines the recrystallized grains. When the Cr content is 1.0%, it has grains with a size of 40 μm or more. There are two kinds of second phases in Zr-Cu-Cr alloys. Zr₂Cu phase (bct) with a size of 100 nm or more and ZrCr₂ phase (hcp) with a size of 60 nm or less. As the content of Cu increases, the number of Zr₂Cu increases. As the content of Cr increases, the size of ZrCr₂ phase does not change obviously, but the number and distribution band density increase. When exposed to the superheated steam at 400℃/10. 3 MPa, the corrosion resistance of Zr-0.3Cu-0.2Cr and Zr-0.3Cu-0.5Cr alloys is worse, the other alloys still don't have corrosion transition after corroding 100 days, and the corrosion resistance is better. Zr-1.0Cr alloy has the best corrosion resistance. When exposed to the 360℃/18.6 MPa/0.01 mol/L LiOH aqueous solution for 42 days, all of alloys have poor corrosion resistance, and the addition of Cu element reduces their corrosion resistance. (authors)