Entity

Time filter

Source Type

Beijing, China

Zheng Y.-M.,China Institute of Atomic Energy | Zheng Y.-M.,CNNC Everclean Co. | Wang J.-Q.,China Institute of Atomic Energy | Yao S.-H.,China Institute of Atomic Energy | And 2 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2013

The activity measurement of 88Y by 4π(PPC)X-γ digital coincidence counting method was introduced in this paper. In order to improve detection efficiency of X ray, high pressure proportional counter was used. It is found that the argon methane gas has the advantage of high detection efficiency and low operating voltage by comparing the plateau curves of methane gas and argon methane gas. The argon methane gas is chosen as the working gas. After the collection of original spectrum, different γ windows were selected for the offline digital coincidence counting calculation, and the efficiency extrapolation values and the measurement uncertainty were analyzed. Source


Bai F.,Tsinghua University | Bai F.,China University of Petroleum - Beijing | He C.,CNNC Everclean Co. | Chen G.,China University of Petroleum - Beijing | And 3 more authors.
Energy Procedia | Year: 2013

A series of dicyclohexano-18-crown-6 (DCH18C6) homologues containing different alkyl substituents were synthesized for a comparative study of the extraction ability towards strontium. The synthesis and the structure characterization of the intermediates and the products were detailed. The crown ether homologues were labeled as CX-DCH18C6 (X=3∼7), where the X represents the number of the carbon atoms in the alkyl substituents. The extraction ability of the CX-DCH18C6 samples towards strontium in solvent extraction system was investigated. The substituent effect of the samples was discussed, and the factors affecting the separation such as solvent, acidity and initial metal concentration were examined. © 2013 The Authors. Source


Yu L.-Z.,CNNC Everclean Co. | Sun L.-C.,Harbin Engineering University | Sun Z.-N.,Harbin Engineering University
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2010

A model for predicting single-phase flow resistance in channel filled with particles was developed by using Fluent6.3 software. It is showed that the predictions agree well with the experimental data for nondimensional D=0.16, 0.1 and 0.04; flow resistance increases with decrease of non-dimension diameter D; the pressure drop of single-phase in porous media channel can not be well predicted by existing models, from which the numerical results are considerably influenced by the selected methods for calculating the drag coefficient CF in these models. Source


Liu C.,CNNC Everclean Co. | Tang C.-H.,Tsinghua University | Liu B.,Tsinghua University | Sheng F.,CNNC Everclean Co. | Su H.-Y.,CNNC Everclean Co.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2011

ZrC coating is the most potential retardant layer of high-temperature gas-cooled reactor (HTGR) coated fuel particles. Simulative calculation of chemical vapor depositing (CVD) ZrC coating was studied with HSC-Chemistry 5.0 code. It is found that the proper technological parameter range of ZrC coating is the C/Zr ratio of raw gas 0.5-1.5, the H 2/Ar ratio of raw gas 0.5-1.5, and the temperature 1450-1650°C. Source


Li X.-G.,CNNC Everclean Co. | Zhang Y.-J.,CNNC Everclean Co. | Liu C.,CNNC Everclean Co.
He-Huaxue yu Fangshe Huaxue/Journal of Nuclear and Radiochemistry | Year: 2011

A conceptual design of a ventilation system for elimination of high radioactivity concentration radon gas from a decommisioning underground storeroom is described in this paper. A mathematical model is constructed for predition of the variation of radon radioactivity concentration upon time in the storeroom during ventilation. The model is further improved by introduction of a modification factor M whose value is determined by fitting to the experimental data. The final model is C t=C 0e -(MN)t + E/V+C air·(MN)/MN-λ [e -λt-e -(MN)t]. The modified model can satisfactorily predict the radon radioactivity concentration in the storeroom at any time, and precisely calculate the ventilation time needed for decrease the radon radioactivity concentration to an acceptable level to avoid harmful inner irradiation by inhalation. Source

Discover hidden collaborations