Hainan Nuclear Power Co.

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Hainan Nuclear Power Co.

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Lin Q.-H.,Hainan Nuclear Power Ltd Company | Xu T.-F.,Hainan Nuclear Power Ltd Company
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2017

Metal ions of the water containing boric acid are usually detected by atomic absorption spectroscopy and inductively coupled plasma optical emission spectrometer in nuclear power plants. Under the existence of the boric acid in water, the metal ion recovery rate and accuracy are significantly affected by boric acid with the method of atomic absorption spectroscopy. The limit of detection of inductively coupled plasma optical emission spectrometer is not enough to meet the need of trace metal ions in nuclear power plants. In this study, using the selective permeability of ion exchange membranes of suppressor to remove boric acid online, the metal ions were accurately determined by ion chromatography. The recovery rates of standard addition, relative standard deviations and method detection limits of Li+, Na+, K+, Mg2+ and Ca2+ are 97.0%-102.3%, 0.54%-1.25% (n=7) and 2.58-40.38 ng/L respectively, which demonstrates that this method can be applied in the analysis of Li+, Na+, K+, Mg2+ and Ca2+ concentrations in nuclear power plants. This method has the advantage of easy operation, reliability, fast speed and low detection limits. © 2017, Editorial Board of Atomic Energy Science and Technology. All right reserved.


Wang Z.,Nuclear Power Institute of China | Yu J.,Nuclear Power Institute of China | Wang J.,Hainan Nuclear Power Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2014

The safe-end weld of steam generator is narrow seam weld with dissimilar metal, the filling material is nickel alloy 152/182 (material 690). The interior structure is of great anisotropic, and fake signal may occur during the defect detection by ultrasonic wave and the error for defect location may be increased. Stratified inspection by ultrasonic transducers with different angle and focus is a practical method which is verified by the real inspection while the linear indication in the inside surface besides the interior flaws are detected.


Han L.-Y.,Hainan Nuclear Power Co. | Yuan P.,China Nuclear Power Engineering Co.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2013

It introduces a kind of quartz crucible thickness tester, with 241Am as the low energy gamma ray source, the material of the scintillator in the detector is a NaI (TI). The Precision machinery device drives the detector in the quartz crucible surface move around. The measuring instrument has the characteristics of high precision, simple operation, light and portable, the results are given for 5 seconds.


Gao Z.,Tianjin University | Liu X.,Tianjin University | Wen L.,Hainan Nuclear Power Co. | Kang W.,Tianjin University
International Journal of Electrochemical Science | Year: 2016

Effect of calcareous sediments on hydrogen evolution potential which formed under different cathodic protection potentials was investigated in this paper. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and hydrogen permeation experiment were carried out to analyze the electrochemical properties of 16Mn steels covered with different calcareous sediments. The microstructures of different calcareous sediments were obtained by using three-dimensional microscope and scanning electron microscopy (SEM). It is concluded that, hydrogen evolution potentials of 16Mn steels covered with different calcium deposits shift negatively to different degrees. As pre-polarization potential turns negative, hydrogen evolution potential of 16Mn steels pre-treated turns negative constantly at first and then turns positive. The hydrogen evolution potential corresponding to pre-polarization potential at -1.05V is the lowest. Corresponding to the change of hydrogen evolution potential, applying pre-polarization ranging from -0.90V to -1.05V, the calcareous sediments obtained become thicker and thicker. Embossments of calcareous sediments increase gradually. Until applying the potential at -1.10v, the calcareous sediments are damaged. Mechanisms of the phenomenon that hydrogen evolution potential shifts negatively are as follows: one factor is the IR drop caused by calcareous sediments. Another factor is the calcareous sediments can hinder the diffusion of H2 to solution and indirectly inhibit the hydrogen evolution reaction. © 2016 The Authors.


Xin P.,Hainan Nuclear Power Co. | Li Y.,Hainan Nuclear Power Co. | Yang L.,Hainan Nuclear Power Co.
China International Conference on Electricity Distribution, CICED | Year: 2014

Steam Generator (short for SG) water-level controlling system is the most important controlling system in the second loop of PWR Nuclear Power Plant (short for NPP). If this system falls in abnormal operation, the steam generator water-level deviate from the set value. When the water level exceeds the specified limits, it will result in reactor shutdown, and affect the economy of the NPP and rank of WANO. The SG water level controlling system of Qinshan No.1 NPP puts into use in 1994. Due to the limitation of technical level at that time, microcontroller runs at a slow speed and the memory capacity is small. Transient process and bulk data processing will cause the system collapse. In service, proportional integral regulator output saturation occasionally, which cause level out of controlling. Worse still, manufacturer is no longer producing such kind of hardware and technical supports are unavailable at the same time. In order to supply a reliable backup water-level measurement system for operator, when the main Steam Generator water-level control system fails, we design and produce an alternate level measurement system based on Siemens PLC, S7-315. © 2014 IEEE.


Xin P.,Hainan Nuclear Power Co. | Yang L.,Hainan Nuclear Power Co. | Li Y.,Hainan Nuclear Power Co.
China International Conference on Electricity Distribution, CICED | Year: 2014

Electromagnetic acoustic transducer (short for EMAT) technique is a relatively new method in domestic non-destructive testing (short for NDT). Compared to Piezoelectric technique, EMAT does not need couplant and surface pre-treatment; in addition, it can produce many kinds of ultrasonic. No need for couplant enables real-time measurement of stress of high temperature equipment and pipe thickness due to corrosion caused by erosion. Several of waveforms make it more methods for measurement, such as Guided Wave can detect internal defects in long straight pipe by line scanning. Surface wave can detect the defects on the entire circumferential surface at any point on the circumference. To analyse electromagnetic ultrasonic excitation principle of non-magnetic materials and magnetic materials, use Maxwell functions to derive the expression of Lorentz force, magnetostrictive fore and magnetizing force in infinite plate. And describes the working principle of an electromagnetic ultrasonic device © 2014 IEEE.


Rao Z.-Q.,Hainan Nuclear Power Co Ltd
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2015

There are differenton-line measurements for boron concentration in domestic PWR NPPs, such as neutron absorption, titration and density etc. The principles of measurement of boron concentration as well as the application and maintenance of relevant on-line boron analyzer in domestic PWR NPPs are described. The comparison for both advantage and disadvantage of the different on-line boron analyzers are also made in this paper. It can offer a reference for the on-line boron analyzers in model selection, operation, repair and maintenance as well as improvement of utilization. ©, 2015, Atomic Energy Press. All right reserved.


Lin Q.,Hainan Nuclear Power Ltd Company
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2016

The boron-lithium coordination solution was used to control the primary circuit water chemistry conditions of pressurized water reactor nuclear power plants. Under the existence of the boric acid in the primary circuit water, the lithium concentration recovery significantly decreased. In this study, we developed an ion chromatography suppressor-atomic absorption spectroscopy (ICS-AAS) online analysis system. Under the optimized conditions, the recovery of standard addition and relative standard deviations were 100% and 0.37 (n=6). The system effectively eliminates the interference of boric acid, which demonstrates that the present system can be applied in the lithium concentration analysis in the primary circuit water of nuclear power plants. The system has the advantage of simple structure, convenient operation, low cost, no pollution by the boric acid in flame atomic absorption spectroscopy, and "zero" reagent consumption. © 2016, Editorial Board of Journal of Nuclear Power Engineering. All right reserved.


Li K.,Hainan Nuclear Power Company
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2015

The different reasons of LPMS alarm in nuclear power plant have been analyzed. Based on this analysis, the analysis steps for Hainan nuclear power plant in case a LPMS alarm was proposed. The management measure for LPMS alarm analysis process of a domestic nuclear power plant has been suggested. It has reference value for nuclear power plant to analysis LPMS alarm reason. It's helpful to safety and economy of nuclear power plant. © 2015, Editorial Board of Nuclear Electronics & Detection Tech. All right reserved.


In pressurized water reactor nuclear power plants, the primary circuit water chemistry control uses the boron-lithium coordination solution. Under the existence of the boric acid in the primary circuit water, the lithium recovery significantly decreases with the increase of boron concentration by the method of atomic absorption spectroscopy. In this study, ion exchange resin online separation-atomic absorption spectroscopy system which used allochroic ion exchange resin to remove boric acid of the primary circuit water was developed. The system eliminates the effect of boric acid and reaches the accurate analysis of lithium concentration. Under the optimized conditions, boric acid is completely removed. The recovery of standard addition and relative standard deviation are 101.0% and 0.47% (n=6) respectively. The results demonstrate that the present system can be applied in lithium concentration analysis in the primary circuit water of nuclear power plants. The system has the advantages of simple structure, ease of building without the requirement of complexly fabricated devices, low cost, convenient operation and no pollution by the boric acid in burner of atomic absorption spectroscopy. © 2016, Editorial Board of Atomic Energy Science and Technology. All right reserved.

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