Abstract: The complete finite element model of reactor inernals of a certain type test reactor including grid plate assembly and core component is established. Modal combination method of CQC is adopted for the spectrum analysis of the reactor internals. Effect of added mass in still water on the transverse v...
Abstract: Alloy 82/182 were used extensively in PWR primary coolant system as the DMW weld structure for the pipe nozzle and pipelines. The dissimilar metal welds（DMW） easily appears cracking due to the stress corrosion and fatigue after long operation. Based on the service data from foreign nuclear powers, t...
Abstract: Based on Euler-Bernoulli beam model, this paper establishes the differential equation of arc-curved beam in the free vibration state, and the decoupling solution is theoretically derived, and verified with FEM method. The results show that the modal frequency results of the theoretic method differ f...
Abstract: The Control rod drive mechanism（CRDM） is a key device in the nuclear reactor, and the pressure shell of CRDM is installed on the canopy of the reactor pressure vessel by the Ω seal weld. The primary water stress corrosion is the major factor for the cracking of Ω seal weld, resulting in the leakage ...
Abstract: The tube bundle of heat exchange apparatus may generate flow induced vibration（FIV）under the fluid force. Excessive FIV can cause damage to the heat exchanger components, especially the U-bend section of the nuclear steam generator in two-phase flow. Because of the complexity of two-phase flow and c...
Abstract: The flow-induced vibration（FIV） of the core barrel is very common, and the characteristics of the FIV is important to the security of the nuclear reactor. By monitoring the vibration characteristics of the core barrel, the natural frequencies of the core barrel would decrease, as the nuclear reactor...
Abstract: The two way coupling numerical model for a typical pipe conveying fluid is established based on two way coupling method with CFD and FEM, and the dynamic characteristics of flow-induced vibration are obtained. The effects of flow velocity, stiffness and location of pipe supports on its flow-induced ...
Abstract: The flow-induced vibration characteristic of a new nuclear reactor was analyzed in this paper by performing dynamic test and numerical calculation. A 1/2 scaled-down model of a new designed nuclear reactor was manufactured for performing the dynamic test with the hydrodynamics simulation system at t...
Abstract: Due to the complexity of flow induced vibration in reactors, previous studies mainly focused on the experimental research. Based on the analysis of the random responses of core structures excited by fluctuating pressures, the fluctuating pressures is obtained experimently by scale model. The theoret...
Abstract: The flow induced vibration is studied in this paper by the combined methods of experiment and simulation. Based on the similarity criterion for the flow induced vibration, a 1:5 test model is designed. According to the RG1.20, the experiment study and analysis and calculation are conducted by finite...
Abstract: Referring to the CAP1400 reactor, the test model was constructed with a linear reduced scale of 1/6. FIV test of CAP1400 reactor internals have been done under all kinds of conditions, and complete data is obtained. According to FIV test results, it can be concluded that the design of CAP1400 reacto...
Abstract: Test method is used to research fuel’s natural characteristics and flow induced vibration responses. It obtained the natural frequencies, and responses rule that is flow induced vibration responses increased with flow increases. Then it achieved waterfall for amplitude, frequency and time（flow） on t...
Abstract: This paper reviews the experimental research of flow-induced vibration（FIV） of several reactor structures completed in recent years, such as FIV test of reactor internals of Qinshan Phase Ⅱ, 1:5 model FIV test of reactor internals of ACP1000, and comprehensive vibration assessment plan for HPR1000 r...
Abstract: In this paper, testing principle, testing method, testing measurement system, and testing result have been introduced. According to the result, it can be concluded that the result of the test is reasonable and believable.
Abstract: Numerical analysis combined with test which adopting impacting method is used to achieve the dynamic characteristics of fuel assembly under different boundaries. Firstly, finite-element analysis method is used to predict the natural frequency of fuel assembly, and the results supply a reference for ...
Abstract: Seismic qualification test must be conducted for the valves which are used in the nuclear power stations. When the valves are qualified for the seismic qualification in the first time, the test method is available. Among the existence criterions of the seismic qualification for valves, the seismic q...
Abstract: Employing Oracle database program, following the basic table design based on the third paradigm, a database on nuclear equipment qualification analysis and test data was constructed. The establishment of the database using the index, partition, SQL optimization methods is able to efficiently integra...
Abstract: The vibration issue due to pipe orifice cavitation of NPP containment spray system（EAS） is analyzed combining the field vibration test and numerical simulation analysis method. The study finds that pipe orifice plate choking leads to the emergence of cavitation downstream of the orifice plate, which...
Abstract: The seismic test of CAP1400 control rod drive line was conducted on the multiple point excitation test device. The horizontal direction and vertical direction of the CRDL were excited with multi-frequency earthquake time history at the same time. The strain values and acceleration of test piece unde...
Abstract: Flow-induced vibration of steam generator tubes or fuel rods results in fretting-wear damage due to impacting and rubbing of the tubes against their supports or fuel rods against their grids. Tubes and fuel rods are working at high temperature and pressure. The damages should be bad for the safety o...
Abstract: Small bore pipes, existing in a form of large quantities of instrument pipes, sampling pipes and vent pipes, often suffer mechanical vibration fatigue fracture. Vibration fatigue life is evaluated according to measured vibration stresses for GRE023 pipes in Unit 2 of Yangjiang NPP. Measured accelera...
Abstract: The blocking mass, frame style structure and elasticity separated devices are imported to the plate and shell supports. Schematic designs of vibration attenuation are conducted and simulation model of both modified and primary support structures are constructed, then the vibration transmission chara...
Abstract: Piping system is a complex structure with multi-supports, and it is difficult to evaluate the vibration isolation performance of the system with traditional methods. A beam-rectangular-plate model is used to analyze the vibration transmission characteristics of the piping system in this paper. Furth...
Abstract: Under the excitation of the pump, the pipes of auxiliary system for primary loop have a problem of excessive vibration, and when the vibration is transmitted to the installed base, it may result in serious troubles. To solve this problem, the study on piping vibration control of auxiliary system nee...
Abstract: As important engineering structures, the pipe system is widely used in the primary circuit of the reactor. According to the vibration and noise and safety problems in pipeline system, a new type of multi frequency vibration absorber is designed. And the effectiveness of DVA is validated through expe...
Abstract: To study the over conservative margin of shock stress reduction factor in stainless steel piping designed by elasto-plastic rules, a method is used by carrying out elastic and elasto-plastic calculations for stainless steel piping with scaled three kinds of independent loads of gravity, pressure and...
Abstract: The control on vibraiton with line spectrum of the blade pump, which is a typical rotate pump, has become the research hotspot in the field of vibration and noise control. On the demand of reducing the periodic line spectrum vibration of the blade pump, this paper studied the method for the line spe...
Abstract: Set up a geometry nonlinear finite element model consistent with experiment model to calculate shock response of piping under transient load with nonlinear transient dynamic time history method and made comparison between corresponding experiment data and numeric results. By way of this comparison, ...
Abstract: The noise source identification, qualification and recognition of transmission path are the precondition of the vibration and noise control. In order to meet the engineering requirement of quantitative vibration contribution analysis, the transmission path analysis method was applied to the vibratio...
Abstract: In the present paper, numerical simulation on separating process of cyclone separator used in the steam generator is performed under conditions of different steam velocity based on two-fluid model and Reynolds Stress Model. The effect of steam velocity on separation process of droplets is analyzed. ...
Abstract: The experimental study on critical heat flux of narrow rectangular channel under the condition of single plate heater about upward flow carried on high temperature and high pressures thermal hydraulic test facility was introduced in this paper. The effect of thermal hydraulic parameters such as mass...
Abstract: Based on the experimental work, thermal hydraulic characteristics of sodium boiling are theoretically researched. The object of calculation is an annulus. Liquid sodium is considered incompressible while sodium vapor is considered compressible. Homogeneous flow model is used in the two phase region ...
Abstract: This paper investigates the effect of steam concentration on hydrogen combustion in severe accident condition. By changing the initial concentration of steam, combustion temperature, peak pressure, flame velocity and burn-off rate are compared, and experimental results also are compared. These resul...
Abstract: Based on the design characteristics of the passive residual heat removal system（PRHRS） for small modular reactor, a scaled experimental facility of passive safety system CREST was constructed. A short-term residual heat removal experiment under the station blackout accident（SBO） was performed in the...
Abstract: Parameter sensitivity analysis of the interface force model and/or its key parameters in the momentum transfer models was carried out with the framework of two-fluid model. The effect of the interface force model and/or its key parameters on the axial and radial distribution of two-phase flow parame...
Abstract: An experimental investigation focusing on the interaction between surface catalytic reaction and thermal hydraulics is carried out. Analysis is conducted on the effects of different inlet velocities and hydrogen concentrations on the chemistry and thermal hydraulics. From the experiment results, it ...
Abstract: The large LOCA blowdown simulation experiment is usually needed for the purpose of the performance evaluation of containment sump strainer and downstream effect analysis. In this paper, large LOCA blowdown simulation experiment was conducted by double rupture discs combining with a pneumatic valve, ...
Abstract: The effect of condensation heat transfer ability of containment is one of the significant factors on passive safety system by removing residual heat from core. The experimental study of separate effect on the containment condensation heat transfer was conducted, based on the passive containment cool...
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Sponsored by: Nuclear Power Institute of China
Editorial Office: Nuclear Power Branch of China Nuclear Society
