Nuclear fuel assembly with hydraulically balanced mixing vanes
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G21C-003/322
출원번호
US-0887017
(1997-07-02)
발명자
/ 주소
Nguyen, Quang M.
Lee, Yu C.
DeMario, Edmund E.
Fodi, Jeffrey J.
Redinger, Darin L.
Smith, III, Levie D.
출원인 / 주소
Westinghouse Electric Company LLC
인용정보
피인용 횟수 :
16인용 특허 :
25
초록▼
A support grid for laterally maintaining the relative position of elongated fuel elements within a fuel assembly for use within a core of a nuclear reactor. The grid is formed in the shape of a lattice with the intersecting lattice members defining a plurality of cells, most of which respectively su
A support grid for laterally maintaining the relative position of elongated fuel elements within a fuel assembly for use within a core of a nuclear reactor. The grid is formed in the shape of a lattice with the intersecting lattice members defining a plurality of cells, most of which respectively support the nuclear fuel elements. The remaining cells support nuclear control rod guide tubes and instrumentation thimbles. The cells supporting the nuclear fuel elements are provided with diagonally positioned springs on two, adjacent walls. The springs support the fuel elements against dimples which protrude from the opposite cell walls. The adjacent, diagonal springs in each fuel element cell are inclined in opposite directions. The walls of the cells supporting the control rod guide tubes are embossed along their height at the locations intermediate the intersection between adjoining walls with a concave notch having a curvature which conforms to the outside surface curvature of the control rod guide tubes. The grid is provided with mixing vanes which are positioned in a symmetrical, regional pattern, with the pattern varying between adjacent regions, and configured such that the hydraulic forces across the center of the grid are balanced. The grid is reinforced with welds at the mid point of the intersection of the lattice straps.
대표청구항▼
A support grid for laterally maintaining the relative position of elongated fuel elements within a fuel assembly for use within a core of a nuclear reactor. The grid is formed in the shape of a lattice with the intersecting lattice members defining a plurality of cells, most of which respectively su
A support grid for laterally maintaining the relative position of elongated fuel elements within a fuel assembly for use within a core of a nuclear reactor. The grid is formed in the shape of a lattice with the intersecting lattice members defining a plurality of cells, most of which respectively support the nuclear fuel elements. The remaining cells support nuclear control rod guide tubes and instrumentation thimbles. The cells supporting the nuclear fuel elements are provided with diagonally positioned springs on two, adjacent walls. The springs support the fuel elements against dimples which protrude from the opposite cell walls. The adjacent, diagonal springs in each fuel element cell are inclined in opposite directions. The walls of the cells supporting the control rod guide tubes are embossed along their height at the locations intermediate the intersection between adjoining walls with a concave notch having a curvature which conforms to the outside surface curvature of the control rod guide tubes. The grid is provided with mixing vanes which are positioned in a symmetrical, regional pattern, with the pattern varying between adjacent regions, and configured such that the hydraulic forces across the center of the grid are balanced. The grid is reinforced with welds at the mid point of the intersection of the lattice straps. l loop of claim 1, wherein the detector is a frequency detector. 9. The control loop of claim 1, wherein the detector and gm amplifier are implemented using CMOS technology. 10. The control loop of claim 1, wherein the detector and gm amplifier are implemented using differential circuits. 11. The control loop of claim 1, wherein the gm amplifier includes: a differential amplifier configured to receive the filtered signal; and a current load circuit coupled to the differential amplifier and configured to provide the current output signal. 12. The control loop of claim 11, wherein the gm amplifier further includes: a common mode feedback circuit operative to receive the current output signal and to provide a signal that adjusts an average current of the current load circuit. 13. The control loop of claim 1, wherein the detector output signal has a peak-to-peak signal swing of less than one volt. 14. The control loop of claim 1, wherein the detector, gm amplifier, and at least a portion of the loop filter and oscillator are implemented within one CMOS integrated circuit. 15. A transceiver circuit comprising the control loop of claim 1. 16. A communication system comprising the control loop of claim 1. 17. The control loop of claim 1, wherein the lowpass filter is implemented using differential circuits. 18. The control loop of claim 17, wherein the detector output signal includes a pair of up signals and a pair of down signals, the pair of up signals further including a up positive signal and a up negative signal that are opposite of each other, and the pair of down signals further including a down positive signal and a down negative signal that are opposite of each other; wherein the lowpass filter is configured to receive the pairs of up and down signals and provide the filtered signal having a positive component and a negative component; and wherein the up positive signal is coupled to the down negative signal to provide the positive component and the up negative signal is coupled to the down positive signal to provide the negative component. 19. A phase locked loop comprising: a phase detector configured to receive an input signal and a reference signal and to provide a detector output signal indicative of timing differences between the input signal and the reference signal; a lowpass filter coupled to the phase detector and configured to receive the detector output signal and to provide a filtered signal; a gm amplifier coupled to the lowpass filter and configured to receive the filtered signal and to provide a current output signal, wherein use of the filtered signal facilitates design requirements of the gm amplifier thereby improving operations thereof; a loop filter coupled to the gm amplifier and configured to receive the current output signal and to provide a control signal; and an oscillator coupled to the loop filter and configured to receive the control signal and to provide a clock signal having a frequency that is adjusted by the control signal, and wherein the reference signal is derived from the clock signal, and wherein the input signal is a serial data stream. 20. The phase locked loop of claim 19, wherein the phase detector and gm amplifier are implemented using CMOS technology. 21. A method for generating a clock signal locked to an input signal, the method comprising: receiving the input signal and a reference signal derived from the clock signal; generating a detector output signal indicative of timing differences between the input signal and the reference signal; filtering the detector output signal with a lowpass filter to remove high frequency components; converting the filtered detector output signal to a current signal with a transconductance (gm) amplifier, wherein use of the filtered detector output signal facilitates design requirements of the gm amplifier thereby improving operations thereof; filtering the current signal with a loop filter to generate a control si
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (25)
Canat Jean-Nol (Lyons FRX) Mortgat Rgis (Couzon au Mont d\Or FRX), Additional grid for a nuclear reactor fuel assembly, and assembly comprising an application thereof.
Wilson John F. (Murrysville Boro PA) Cerni Samuel (Churchill Boro PA) Gjertsen Robert K. (Monroeville PA), Control rod end plug with a stabilizing configuration.
DeMario Edmund E. (Columbia SC) Lawson Charles N. (Columbia SC), Fuel assembly including deflector vanes for deflecting a component of a fluid stream flowing past such fuel assembly.
Suchy Peter (Erlangen DEX) Bruch Gnter (Nohfelden DEX) Steinke Alexander (Ebermannstadt DEX) Bkers Franz-Josef (Frth DEX), Fuel assembly with a grid structure between the rods.
Aldrich Michael E. (Forest VA) Farnsworth David A. (Lynchburg VA) Morgan Charles D. (Lexington VA) Tucker Jeffrey S. (Lynchburg VA), Spacer grid for a nuclear fuel assembly.
Rodack Thomas (Granby CT) Karoutas Zeses E. (Simsbury CT) Broders Richard P. (Grandy CT), Spacer grid with integral “side supported”flow directing vanes.
Perrotti Patrick A. (Newington CT) Joffre Paul F. (Colchester CT) Karoutas Zeses E. (Simsbury CT) Corsetti Lawrence V. (Granby CT) Bryan William J. (Granby CT) Hatfield Stephen C. (Granby CT), Split vaned nuclear fuel assembly grid.
Obermeyer Franklin D. (Pensacola FL) Middlebrooks Willis B. (Pensacola FL) DeMario Edmund E. (Columbia SC), Vibration dampener for dampening vibration of a tubular member.
Kropaczek, David Joseph; Andersen, Jens; Shaug, James; Asgari, Mehdi, Computer-implemented method and system for designing a nuclear reactor core which satisfies licensing criteria.
Rozhkov, Vladimir Vladimirovich; Lavrenyuk, Petr Ivanovich; Kislitsky, Aleksandr Antonovich; Troyanov, Vladimir Mikhailovich; Enin, Anatoly Alekseevich; Shustov, Mstislav Aleksandrovich; Ustimenko, Aleksandr Pavlovich; Nekhoda, Mikhail Mikhailovich; Samoilov, Oleg Borisovich, Distance lattice for fuel rod assembly in nuclear reactor.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.