Application of the Dynamic Rod Worth Measurement Method on WWER

2018 ◽  
Author(s):  
Wenbo Zhao ◽  
Zhumin Jiang ◽  
Liangzi Wang ◽  
Chenlin Wang ◽  
Yingrui Yu ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Measurement Method ◽  
Static Method ◽  
Euler Formula ◽  
Spatial Factors ◽  
3D Space ◽  
Backward Euler ◽  
Shape Equation ◽  
Predicted Values ◽  
Boron Dilution

The dynamic rod worth measurement method, which is used widely for PWR with square geometry lattices, is applied on WWER type reactor with hexagonal geometry lattices. RTNP code is developed to calculate the static spatial factors (SSF) and the dynamic spatial factors (DSF) through simulating the 3D space-time neutron dynamics and the response of excore detector during the measurement process. The improved quasi-static method is used for temporal discretization. The time-dependent shape equation is then transferred to a fixed source problem through backward Euler formula. And Multi-group Monte Carlo method is used to solve this fixed source problem. Four tests on Tianwan nuclear power plant (NPP) units 1&2 have been done since 2015. The measured results agree well with the predicted values. It takes about half hour per bank and 5 hours to measure all banks worth. The conventional boron dilution was used for rod worth measurement of Tianwan NPP units 1&2. It took at least 2 hours per bank and produced lots of boron wastes. The boron dilution has been replaced with this method for Tianwan NPP units 1&2.

scholarly journals An efficient adaptive grid method for a system of singularly perturbed convection-diffusion problems with Robin boundary conditions

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Li-Bin Liu ◽  
Ying Liang ◽  
Xiaobing Bao ◽  
Honglin Fang
Keyword(s):  
Boundary Conditions ◽  
Grid Method ◽  
Posteriori Error ◽  
Adaptive Grid ◽  
Singularly Perturbed ◽  
Robin Boundary Conditions ◽  
Euler Formula ◽  
Convection Diffusion ◽  
Backward Euler ◽  
Robin Boundary

AbstractA system of singularly perturbed convection-diffusion equations with Robin boundary conditions is considered on the interval $[0,1]$ [ 0 , 1 ] . It is shown that any solution of such a problem can be expressed to a system of first-order singularly perturbed initial value problem, which is discretized by the backward Euler formula on an arbitrary nonuniform mesh. An a posteriori error estimation in maximum norm is derived to design an adaptive grid generation algorithm. Besides, in order to establish the initial values of the original problems, we construct a nonlinear optimization problem, which is solved by the Nelder–Mead simplex method. Numerical results are given to demonstrate the performance of the presented method.

Development of Remote Measuring System for RVI Modularization

2008 ◽  
Author(s):  
Tae-Soon Kim ◽  
Jae-Gon Lee ◽  
Je-Jun Lee ◽  
Myeong-Man Park
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Conventional Method ◽  
Electromagnetic Interference ◽  
Nuclear Power ◽  
Measurement Method ◽  
Zero Point ◽  
Reactor Vessel ◽  
Measuring System ◽  
Remote Measurement

The construction duration of a nuclear power plant has been considered as a important factor to occupy the competitive edge. For the optimization process of APR1400 which is nuclear reactor newly developed in Korea, it has been suggested that the modularization of reactor vessel internals (RVI) was one of useful means to reduce the construction duration. In general, RVI consists of three components such as core support barrel (CSB), lower support structure/core shroud (LSS/CS) and upper guide structure (UGS). It is complicated and tedious to assemble the RVI by the conventional method which requires about 8∼10 months. In order to modularize the RVI, the gap between the CSB snubber lug and the reactor vessel (RV) stabilization lug must be measured by a remote measurement method. By using a remote measurement method, the welding of CSB and LSS/CS can be performed in advance of the reactor installation process to reduce the construction duration of a nuclear power plant. Compared with the conventional method, the duration of about 2 months required in the welding of CSB and LSS/CS is finally reduced. In this study, first of all we developed the remote measuring system that included the digital probes to measure the 72 points of gap at once. The system device consists of digital probe section, pneumatic supply and control section, electric power section, remote control computer and program. The selected digital probe of linear variable differential transformer (LVDT) type and the calibration device for the zero-point adjustment jig and the other devices have sufficient reliability and accuracy. And the digital probe connection jig has sufficient consistency. The network and system for remote measurement were very stable and no disturbance at electromagnetic interference environment. And we carried out the proof test of our remote measuring system to evaluate the application on the real plant conditions using the RV and RVI mock-up. The results of remote measurement were compared with existing manual measuring method and the reliability of the system was verified. Finally, we confirmed that our remote measuring system had the efficient reliability could be applied to measure the gap of RVI.

Predictive Measurement Method for Time Grating Displacement Sensor

2008 ◽  
Vol 381-382 ◽  
pp. 403-406 ◽  
Author(s):  
Xiao Kang Liu ◽  
Ye Tai Fei ◽  
D. Peng ◽  
X. Wang
Keyword(s):  
Prediction Error ◽  
Measurement Method ◽  
Servo Control ◽  
Displacement Sensor ◽  
Rotary Table ◽  
Positioning Accuracy ◽  
Measuring Period ◽  
Position Feedback ◽  
Predicted Values ◽  
Measuring Space

Time grating displacement sensor is briefly introduced for measuring space with time. The measured values of time grating will not update during the measuring period. To use the sensor as position feedback component for CNC rotary table positioning servo control, this paper firstly introduces prediction conception to measurement field, and predictive measurement method is firstly proposed. Predicted values are derived form past measured values and the prediction error is corrected in real time using the new measured values. The positioning accuracy of the CNC rotary table is improved greatly. Experiment results conform the validity of the proposed method.

scholarly journals Development of specific standards of energy consumption by types of produced products of the spinning product

2020 ◽  
Vol 216 ◽  
pp. 01169
Author(s):  
F A. Hoshimov ◽  
I I Bakhadirov ◽  
M S Kurbanbayeva ◽  
N.A. Aytbayev
Keyword(s):  
Energy Consumption ◽  
Power Consumption ◽  
Energy Intensity ◽  
Electricity Consumption ◽  
Static Method ◽  
Specific Power ◽  
Specific Power Consumption ◽  
Factors Influencing ◽  
Static Data ◽  
Predicted Values

The article deals with the regulation of the energy consumption of a spinning enterprise. For a certain pattern of changes in power consumption and specific power consumption, we studied the hourly performance, which determines the performance of the machine. On the basis of the predicted values of the volume of production, the norms of electricity consumption were developed, which are reflected, taking into account its specificity, the energy intensity of products. When developing the norm, a calculated static method was adopted, based on the analysis of static data for a number of previous years, on the actual consumption of electricity, the volume of output of factors influencing their change.

Experimental Study on Critical Load of Compression Column with a Rectangular Cross-Section Based on Material Mechanics

2014 ◽  
Vol 908 ◽  
pp. 287-290
Author(s):  
Shi Chuang Zhuo ◽  
Qiang Zhang ◽  
Shun Cai Li
Keyword(s):  
Experimental Study ◽  
Critical Load ◽  
Cross Section ◽  
Strain Measurement ◽  
Measurement Method ◽  
Test Bench ◽  
Rectangular Cross Section ◽  
Resistance Strain ◽  
Euler Formula ◽  
Horizontal Asymptote

By means of resistance strain gauge and multifunctional test bench of materials mechanics, the relation curve between the axial compressive forces of the two-ends hinged column with a rectangular cross-section and total bridge strain was obtained by the resistance strain measurement method, accordingly, by the horizontal asymptote of this relation curve the critical load of compression column was obtained. The study indicates that the critical load obtained respectively by the resistance strain measurement method and Euler formula theory fits very well, and the research results verified the reliability of the experimental method.

Noncontact Measurement Method of Vibration Stress Using Optical Displacement Sensors for Piping Systems in Nuclear Power Plants

2015 ◽  
Vol 1 (3) ◽  
Author(s):  
Akira Maekawa ◽  
Tsuneo Takahashi ◽  
Takashi Tsuji ◽  
Michiyasu Noda
Keyword(s):  
Nuclear Power ◽  
Measurement Method ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Vibration Measurement ◽  
Piping System ◽  
Noncontact Measurement ◽  
Displacement Sensors ◽  
Optical Displacement ◽  
Vibration Stress

In nuclear power plants, vibration stress of piping is frequently measured to prevent the occurrence of fatigue failure. A simpler and more efficient measurement method is desired for rapid integrity evaluation of piping. In this study, a method to measure vibration stress in a noncontact manner using optical displacement sensors is presented and validated. The proposed method estimates vibration-induced stress of small-bore piping directly using noncontact sensors based on a light-emission diode. First, the noncontact measurement method was proposed, and the measurement instrument based on the proposed method was developed for the validation. Next, vibration measurement experiments using the instrument were conducted for a mock-up piping system and an actual piping system. The measurement results were compared with the values measured by the conventional method of known accuracy using strain gauges. From this comparison, the proposed noncontact measurement method was demonstrated to be able to provide sufficient accuracy for practical use.

scholarly journals -Stable Derivative-Free Error-Corrected Trapezoidal Rule for Burgers' Equation with Inconsistent Initial and Boundary Conditions

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Lajja Verma
Keyword(s):  
Boundary Conditions ◽  
Burgers Equation ◽  
Trapezoidal Rule ◽  
Third Order ◽  
Euler Formula ◽  
Arithmetic Average ◽  
Backward Euler ◽  
Derivative Free ◽  
Initial And Boundary Conditions

We combine suitable arithmetic average approximations, with explicit backward Euler formula, and derive a third-order -stable derivative-free error-corrected trapezoidal rule (LSDFECT). Then, we apply LSDFECT rule to the linearized Burgers' equation with inconsistent initial and boundary conditions and test its stability and exactness. We use Mathematica 7.0 for computation.

A Study on Community-Based Reconstruction from Nuclear Power Plant Disaster - A Case Study of Minamisoma Ota Area in Fukushima -

2012 ◽  
Vol 7 (sp) ◽  
pp. 432-438 ◽  
Author(s):  
Tomoyuki Furutani ◽  
◽  
Keisuke Uehara ◽  
Jun Murai ◽  
Keyword(s):  
Power Plant ◽  
Nuclear Power ◽  
Measurement Method ◽  
Radiation Measurement ◽  
Community Based ◽  
Measurement Framework ◽  
Measurement Results ◽  
Before And After ◽  
Radiation Measurements

In this research, the authors developed a car-borne radiation measurement method for the farmland and roads in the Minamisoma Ota area of Fukushima that was devasteted by the Great East Japan Earthquake that occurred in northeast Japan on March 11, 2011, and a community-led radiation measurement framework was established and implemented. As a result, radiation measurements and visualization for farmlands, paddies, and forests, which had been conventionally unachievable, was made possible. Furthermore, effective verification of the effect of decontamination also became possible by feeding back radiation measurement results before and after decontamination to residents.

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