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	1. Evaluation of interfacial properties in SiC composites using an improved cohesive element method
	ZANG Hang,CAO Xingqing,HE Chaohui,HUANG Zhisheng,LI Yonghong
	Nuclear Science and Technology 17 April 2017
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	Abstract:A two-dimensional axisymmetric finite element model based on an improved cohesive element method was developed to simulate the the interfacial debonding, the sliding friction and residual thermal stresses of SiC composites during single fiber push-out test to extract the interfacial bond strength and frictional stress. The numerical load-displacement curves agree well with the experimental curves, indicating that this cohesive element can be used for calculating the interfacial properties of SiC composites. The simulation results show that the crack is most likely to occur at both ends of the experiment, where the maximum shear stress is observed, and the interfacial shear strength and the constant sliding friction stress decrease with an increase of temperature. Moreover, the load required to cause a complete failure of the interface is with the increase of shear strength and composite material with higher fiber volume fraction has stronger bearing capacity. In addition, the initial failure load becomes stronger with an increase of interphase thickness.
	TO cite this article:ZANG Hang,CAO Xingqing,HE Chaohui, et al. Evaluation of interfacial properties in SiC composites using an improved cohesive element method[OL].[17 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725456


	2. Cold leg break LOCA Analysis for Canadian-SCWR with passive safety system
	CHAO Fei,YUAN Yuan,WU Pan,SHAN Jianqiang,GOU Junli
	Nuclear Science and Technology 09 May 2016
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	Abstract:Safety analysis is an important issue in SuperCritical Water Reactor concept development. Loss of coolant accident is one of the most important accident which should be treated seriously. The cold leg break LOCA analyses are carried out in this paper to evaluate the feasibility of Canadian SCWR. Passive safety systems, such as automatic depressurization system, accumulator and gravity driven cooling system are applied to mitigate the LOCA consequence. The following conclusions are achieved:1) two cladding temperature peaks will appear in the process of cold leg break LOCA. The discharge flowrate through cold leg break is favourable to decrease the first cladding temperature peak. Automatic depressurization system can decrease the second cladding temperature peak effectively. The first peak cladding temperature in 25% break case is higher than that in 100% break case, while the second peak cladding temperature in 25% break case is lower than that in 100% break case. 2) The peak cladding temperatures of Canadian SCWR with passive safety system under cold leg break LOCA stay below the temperature criterion.
	TO cite this article:CHAO Fei,YUAN Yuan,WU Pan, et al. Cold leg break LOCA Analysis for Canadian-SCWR with passive safety system[OL].[ 9 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4687309


	3. Commissioning of the LLRF control system for DC-SRF photo-injector
	WANG Fang,FENG Liwen,LIN Lin
	Nuclear Science and Technology 17 November 2015
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	Abstract:DC-SRF photo-injector, which can be operated in continuous wave (CW) and pulse mode, was firstly proposed and developed by Peking University. It combines a 1.3 GHz 3+1/2-cell superconducting cavity working at 2 K. Due to the thin walled structure and narrow bandwidth, the superconducting cavity is very susceptible to mechanical perturbations which induces significant amplitude and phase errors and resulting in electron beam quality degradation. In the paper, the parameters of the proportional-integral (PI) controller are optimized in MATLAB and a new controller is presented and simulated in Simulink to deal with the Lorentz force detuning during the filling stage of the cavity in pulse mode. The digital low level radio frequency (LLRF) control system is improved and accomplished based on the new controller, the amplitude and phase stability of the 3+1/2-cell superconducting cavity in pulse mode achieve 0.13% and 0.1 respectively, and it runs stably during the high repetition terahertz radiation experiments based on the DC-SRF photo-injector.
	TO cite this article:WANG Fang,FENG Liwen,LIN Lin. Commissioning of the LLRF control system for DC-SRF photo-injector[OL].[17 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661619


	4. Proposal of a new fuel assembly design for supercritical water cooled reactor
	LIU Xiaojing,CHENG Xu
	Nuclear Science and Technology 05 May 2014
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	Abstract:The supercritical water cooled reactor (SCWR) is a Light Water Reactor (LWR) operating at higher pressure and temperature. Operation above the critical pressure eliminates coolant boiling phenomenon so that the coolant remains single-phase throughout the reactor. Due to its high thermal efficiency and economical competitiveness, SCWR has achieved significant interests of nuclear industries and research institutions. R&D programs have been launched worldwide to study the phenomena involved in SCWR. Design of fuel assemblies of thermal SCWR is one of the main challenging tasks due to: complicated fuel assembly configurations and strong coupling effect of thermal-hydraulics with neutron-kinetics. Although a large number of fuel assembly designs have been proposed, no agreement has been achieved. Further activities are thus needed to develop reliable numerical analysis tools and to propose and assess new fuel assembly designs. In the present paper, new design concepts of SCWR fuel assembly were proposed. The thermal-hydraulic performance and neutron-physical behavior of the new fuel assemblies were investigated using the newly developed coupled code. The results achieved so far indicate the new fuel assembly design has a more uniform dist

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