The Experts below are selected from a list of 24147 Experts worldwide ranked by ideXlab platform

Bo Hanliang - One of the best experts on this subject based on the ideXlab platform.

  • Deceleration Performance and Parameter Influence Analysis of the Control Rod Hydraulic Deceleration Device for Control Rod Hydraulic Drive System
    Journal of Nuclear Engineering and Radiation Science, 2019
    Co-Authors: Qin Ben-ke, Li Leishi, Bo Hanliang
    Abstract:

    Control Rod hydraulic drive system (CRHDS), which is invented by INET, Tsinghua University, is a new type of internal Control Rod drive technology. Control Rod hydraulic deceleration device (CRHDD), which consists of the plug, the hydraulic deceleration cylinder, etc., is one of the main components of the CRHDS. The CRHDD performs the Rod dropping deceleration function through the interworking of the plug and the deceleration cylinder, which is filled with water, and reduces the Rod dropping peak acceleration and the impact force acting upon the Control Rod to prevent the Control Rod cruciform blade from being deformed or damaged. The working mechanism of the CRHDD is presented and analyzed. The theoretical model of the Control Rod dropping process, which is based upon force analysis of the Control Rod during scram process, three-dimensional flow field analysis, and flow resistance calculation of the hydraulic deceleration cylinder, the kinematics and dynamics analysis of the Control Rod, is built whose results are compared and validated by the CRHDS scram test results. Then the model is used to analyze the influence of the key parameters, including the fuel case gap, the plug design clearance, the working temperature, etc. on the CRHDD working performance. The research results can give guidance for the design and optimization of the CRHDD.

  • Numerical and Experimental Analysis of the Control Rod Hydraulic Deceleration Device for the Control Rod Hydraulic Drive System
    Volume 2: Plant Systems Structures Components and Materials, 2017
    Co-Authors: Qin Ben-ke, Li Leishi, Bo Hanliang
    Abstract:

    Control Rod hydraulic drive system (CRHDS), which is invented by INET, Tsinghua University, is a new type of internal Control Rod drive technology. Control Rod hydraulic deceleration device (CRHDD), which consists of the plug, the hydraulic deceleration cylinder, the hydraulic buffer, etc., is one of the main components of the CRHDS. The plug is connected with the top of the Control Rod driving shaft and moves along with the Control Rod inside the hydraulic deceleration cylinder. The CRHDD performs the Rod dropping deceleration function through the interworking of the plug and the deceleration cylinder which is filled with water, and reduces the Rod dropping peak acceleration and the impact force acting upon the Control Rod to prevent the Control Rod cruciform blade from being deformed or damaged. The working mechanism of the CRHDD is presented and analyzed. The Rod dropping performance of the CRHDS was tested experimentally under room temperature. The theoretical model of the Control Rod dropping process, which is composed of the three dimensional flow field analysis and flow resistance calculation of the hydraulic deceleration cylinder, the kinematics and dynamics model of the Control Rod, is built whose results are compared and validated by the CRHDS scram test results under room temperature. Then the model takes into account of the influence of the fuel assembly box on the Control Rod scram process under high temperature working conditions, and is used to analyze the influence of the key parameters, including the helical spring stiffness inside the deceleration cylinder and the working temperature on the CRHDD working performance. The research results can give guidance for the design and optimization of the CRHDD.

  • studies on the performance of the hydraulic Control Rod drive for the nhr 200
    Nuclear Engineering and Design, 2000
    Co-Authors: Bo Hanliang, Zheng Wenxiang, Dong Duo
    Abstract:

    Theoretical analysis and experimental study on the steady state property of the hydraulic Control Rod drive mechanism for the 200 MW nuclear heating reactor have been carried out in depth. The minimum and maximum holding flow in steady state and their changes along with temperature were identified, and the relationship between the steady state property and the design data of the Control Rod drive mechanism was analyzed too. A fine agreement between the analysis results and measured data has been achieved.

Yuichi Ishizaka - One of the best experts on this subject based on the ideXlab platform.

  • development of in vessel type Control Rod drive mechanism for marine reactor
    Journal of Nuclear Science and Technology, 2001
    Co-Authors: Toshihisa Ishida, Shou Imayoshi, Tsutomu Yoritsune, Hiroshi Nunokawa, Masaaki Ochiai, Yuichi Ishizaka
    Abstract:

    A highly reliable Control Rod drive mechanism (CRDM) installed inside the reactor vessel has developed for use of an advanced marine reactor. This CRDM contributes to compactness and simplicity of the reactor system, and it can eliminate the possibility of a Rod ejection accident. The CRDM works in the high temperature and high pressure water—310°C and 12 MPa, the same atmosphere as the primary loop. Driving force is pRoduced by a synchronous motor with the rotor of a permanent magnet, which has been developed. An innovative latch mechanism using separable ball nuts can latch the driving shaft connecting the Control Rod and de-latch it for scram. The Rod position detector using a magnetostrictive wire type sensor on the principle of Wiedeman effect has been developed, accuracy of which is verified to have a detecting error within 1.2 mm. Ball bearings for thrust and radial supports in rotation have been developed to be capable of working under the high temperature water for a long period. Under condition ...

Qin Ben-ke - One of the best experts on this subject based on the ideXlab platform.

  • Deceleration Performance and Parameter Influence Analysis of the Control Rod Hydraulic Deceleration Device for Control Rod Hydraulic Drive System
    Journal of Nuclear Engineering and Radiation Science, 2019
    Co-Authors: Qin Ben-ke, Li Leishi, Bo Hanliang
    Abstract:

    Control Rod hydraulic drive system (CRHDS), which is invented by INET, Tsinghua University, is a new type of internal Control Rod drive technology. Control Rod hydraulic deceleration device (CRHDD), which consists of the plug, the hydraulic deceleration cylinder, etc., is one of the main components of the CRHDS. The CRHDD performs the Rod dropping deceleration function through the interworking of the plug and the deceleration cylinder, which is filled with water, and reduces the Rod dropping peak acceleration and the impact force acting upon the Control Rod to prevent the Control Rod cruciform blade from being deformed or damaged. The working mechanism of the CRHDD is presented and analyzed. The theoretical model of the Control Rod dropping process, which is based upon force analysis of the Control Rod during scram process, three-dimensional flow field analysis, and flow resistance calculation of the hydraulic deceleration cylinder, the kinematics and dynamics analysis of the Control Rod, is built whose results are compared and validated by the CRHDS scram test results. Then the model is used to analyze the influence of the key parameters, including the fuel case gap, the plug design clearance, the working temperature, etc. on the CRHDD working performance. The research results can give guidance for the design and optimization of the CRHDD.

  • Numerical and Experimental Analysis of the Control Rod Hydraulic Deceleration Device for the Control Rod Hydraulic Drive System
    Volume 2: Plant Systems Structures Components and Materials, 2017
    Co-Authors: Qin Ben-ke, Li Leishi, Bo Hanliang
    Abstract:

    Control Rod hydraulic drive system (CRHDS), which is invented by INET, Tsinghua University, is a new type of internal Control Rod drive technology. Control Rod hydraulic deceleration device (CRHDD), which consists of the plug, the hydraulic deceleration cylinder, the hydraulic buffer, etc., is one of the main components of the CRHDS. The plug is connected with the top of the Control Rod driving shaft and moves along with the Control Rod inside the hydraulic deceleration cylinder. The CRHDD performs the Rod dropping deceleration function through the interworking of the plug and the deceleration cylinder which is filled with water, and reduces the Rod dropping peak acceleration and the impact force acting upon the Control Rod to prevent the Control Rod cruciform blade from being deformed or damaged. The working mechanism of the CRHDD is presented and analyzed. The Rod dropping performance of the CRHDS was tested experimentally under room temperature. The theoretical model of the Control Rod dropping process, which is composed of the three dimensional flow field analysis and flow resistance calculation of the hydraulic deceleration cylinder, the kinematics and dynamics model of the Control Rod, is built whose results are compared and validated by the CRHDS scram test results under room temperature. Then the model takes into account of the influence of the fuel assembly box on the Control Rod scram process under high temperature working conditions, and is used to analyze the influence of the key parameters, including the helical spring stiffness inside the deceleration cylinder and the working temperature on the CRHDD working performance. The research results can give guidance for the design and optimization of the CRHDD.

Masashi Tsuji - One of the best experts on this subject based on the ideXlab platform.

  • Feasibility study for evaluation of Control Rod worth in pressurized water reactors using neutron count rate during a Control Rod drop testing
    Journal of Nuclear Science and Technology, 2006
    Co-Authors: Yoichiro Shimazu, Kennichiro Okazaki, Masashi Tsuji
    Abstract:

    Applicability of the modified Neutron Source Multiplication (NSM) method with extraction of the fundamental mode to subcriticality measurement has been proposed. Following the feasibility verification in the previous study based on numerical analyses, its applicability has been proven in a more realistic situation; in a withdrawal sequence of Control Rod banks during the PWR startup. Subcriticalities with various Control Rod insertion configurations were estimated based on the modified NSM method. The subcriticality could be evaluated with a good accuracy even with the mockup experiment where any special treatments for accurate measurement were not taken into account and furthermore the insensitivity of measured signals by reactivity changes and their large fluctuations were seen. Based on this fact, we further investigated a feasibility to use neutron count rate data obtained during the Control Rod drop testing, which is carried out before the reactor physics tests at hot zero power condition. When it is proven that these data could be used for the estimation of each Control Rod worth, the following reactor physics tests could be performed with the advanced knowledge of each Control Rod worth and procedures for detailed Control Rod worth measurement could be simplified or eliminated from the reactor physics tests.

Toshihisa Ishida - One of the best experts on this subject based on the ideXlab platform.

  • development of in vessel type Control Rod drive mechanism for marine reactor
    Journal of Nuclear Science and Technology, 2001
    Co-Authors: Toshihisa Ishida, Shou Imayoshi, Tsutomu Yoritsune, Hiroshi Nunokawa, Masaaki Ochiai, Yuichi Ishizaka
    Abstract:

    A highly reliable Control Rod drive mechanism (CRDM) installed inside the reactor vessel has developed for use of an advanced marine reactor. This CRDM contributes to compactness and simplicity of the reactor system, and it can eliminate the possibility of a Rod ejection accident. The CRDM works in the high temperature and high pressure water—310°C and 12 MPa, the same atmosphere as the primary loop. Driving force is pRoduced by a synchronous motor with the rotor of a permanent magnet, which has been developed. An innovative latch mechanism using separable ball nuts can latch the driving shaft connecting the Control Rod and de-latch it for scram. The Rod position detector using a magnetostrictive wire type sensor on the principle of Wiedeman effect has been developed, accuracy of which is verified to have a detecting error within 1.2 mm. Ball bearings for thrust and radial supports in rotation have been developed to be capable of working under the high temperature water for a long period. Under condition ...