Spacer grid with side welding support and flow mixing vane for nuclear reactor fuel assembly
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G21C-003/34
출원번호
US-0281472
(2002-10-25)
우선권정보
KR-0066801 (2001-10-29)
발명자
/ 주소
Oh, Dongseok
Chun, Taehyun
In, Wangkee
Song, Keenam
Kim, Hyungkyu
Kang, Heungseok
Yoon, Kyungho
Jung, Younho
출원인 / 주소
Korea Atomic Energy Research Institute, Korea Hydro & Nuclear Power Co., Ltd.
대리인 / 주소
Bachman & LaPointe, P.C.
인용정보
피인용 횟수 :
8인용 특허 :
15
초록▼
A spacer grid for nuclear fuel assemblies is disclosed. This spacer grid has a plurality of side weld supports, that is, main supports, upper sub-supports and lower sub-supports, on its interlaced inner straps, with two flow mixing vanes integrally extending upward from each of the main supports. Th
A spacer grid for nuclear fuel assemblies is disclosed. This spacer grid has a plurality of side weld supports, that is, main supports, upper sub-supports and lower sub-supports, on its interlaced inner straps, with two flow mixing vanes integrally extending upward from each of the main supports. This spacer grid is fabricated by seam-welding the interlaced first and second inner straps to each other along the upper axial junction lines of the crossing main and upper sub-supports at the top of the intersections, and along the lower axial junction lines of the crossing lower sub-supports at the bottom of the intersections, thus forming side weld lines at the intersections. This spacer grid reduces the damage of fuel rod during a fuel rod insertion process by decreasing interference between flow mixing vanes and fuel rods, accomplishes a desired soundness by seam welding, improves the coolant mixing efficiency of the flow mixing vanes by excluding welding windows, and reduces hydraulic resistance caused by weld beads.
대표청구항▼
A spacer grid for nuclear fuel assemblies is disclosed. This spacer grid has a plurality of side weld supports, that is, main supports, upper sub-supports and lower sub-supports, on its interlaced inner straps, with two flow mixing vanes integrally extending upward from each of the main supports. Th
A spacer grid for nuclear fuel assemblies is disclosed. This spacer grid has a plurality of side weld supports, that is, main supports, upper sub-supports and lower sub-supports, on its interlaced inner straps, with two flow mixing vanes integrally extending upward from each of the main supports. This spacer grid is fabricated by seam-welding the interlaced first and second inner straps to each other along the upper axial junction lines of the crossing main and upper sub-supports at the top of the intersections, and along the lower axial junction lines of the crossing lower sub-supports at the bottom of the intersections, thus forming side weld lines at the intersections. This spacer grid reduces the damage of fuel rod during a fuel rod insertion process by decreasing interference between flow mixing vanes and fuel rods, accomplishes a desired soundness by seam welding, improves the coolant mixing efficiency of the flow mixing vanes by excluding welding windows, and reduces hydraulic resistance caused by weld beads. rent output signals is fed to the differential signal filter; wherein the differential Gm cell circuit is coupled to the differential detector and the differential signal filter in a fully differential manner; and wherein the differential Gm cell circuit is implemented using C3MOS logic. 4. The differential phase-locked loop of claim 3 wherein the pair of input signals, the pair of reference signals, the pair of detector output signals, the pair of current output signals, the pair of control signals and the pair of oscillator signals are implemented in a differential manner. 5. The differential phase-locked loop of claim 2 further comprising: a differential divider circuit disposed between the differential voltage controlled oscillator and the differential detector; wherein the differential divider circuit is coupled to the differential voltage controlled oscillator and the differential detector in a fully differential manner; and wherein the differential divider circuit is implemented using C3MOS logic. 6. The differential phase-locked loop of claim 1 wherein the differential detector is a differential phase-frequency detector. 7. The differential phase-locked loop of claim 1 wherein the differential signal filter is a differential lowpass filter. 8. The differential phase-locked loop of claim 1 wherein the differential detector includes: first and second resetable flip-flops configured to receive a first differential signal and a second differential signal respectively; an AND logic function configured to receive differential outputs from the first and second resetable flip-flops; and one or more buffers configured to receive output from said AND logic function and to provide a reset signal to reset the first and second resetable flip-flops. 9. An integrated circuit comprising the differential phase-locked loop of claim 1. 10. A communication system comprising the differential phase-locked loop of claim 1. 11. A phase-locked loop comprising: a detector configured to receive a pair of differential input signals and a pair of differential reference signals and to provide a pair of differential detector output signals indicative of a difference between the pair of differential input signals and the pair of differential reference signals; a Gm cell circuit coupled to the detector and configured to receive the pair of differential detector output signals and to provide a pair of differential current output signals; a signal filter coupled to the Gm cell circuit and configured to receive the pair of differential current output signals and to provide a pair of differential control signals; and a voltage controlled oscillator coupled to the signal filter and configured to receive the pair of differential control signals and to provide a pair of differential oscillator signals which is adjustable based on the pair of differential control signals, the pair of differential oscillator signals is fed back to the detector as the pair of differential input signals; wherein the detector, the Gm cell circuit, the signal filter, and the voltage controlled oscillator are each implemented using CMOS logic. 12. The phase-locked loop of claim 11 further comprising: a divider circuit disposed between the voltage controlled oscillator and the detector; wherein the divider circuit is configured to receive the pair of differential oscillator signals and to provide a pair of differential divided signals to be fed to the detector as the pair of differential input signals; and wherein the divider circuit is implemented using C3MOS logic. 13. The phase-locked loop of claim 11 wherein the detector is a phase-frequency detector. 14. The phase-locked loop of claim 11 wherein the signal filter is a lowpass filter. 15. The phase-locked loop of claim 11 wherein the detector includes: first and second resetable flip-flops configured to receive a first differential signal and a second differen
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이 특허에 인용된 특허 (15)
DeMario Edmund E. (Penn Hills PA) Boyle Raymond F. (Monroeville PA) Kuchirka Peter J. (Penn Hills PA), Coolant flow mixer grid for a nuclear reactor fuel assembly.
Dong-Seok Oh KR; Tae-Hyun Chun KR; Wang-Kee In KR; Kee-Nam Song KR; Hyung-Kyu Kim KR; Heung-Seok Kang KR; Kyung-Ho Yoon KR; Youn-Ho Jung KR, Duct-type spacer grid with swirl flow vanes for nuclear fuel assemblies.
Chun Tae-Hyun,KRX ; Oh Dong-Seok,KRX ; In Wang-Kee,KRX ; Song Kee-Nam,KRX ; Kang Heung-Seok,KRX ; Yoon Kyung-Ho,KRX ; Kim Dae-Ho,KRX ; Bang Je-Geon,KRX ; Jung Youn-Ho,KRX, Fuel assembly spacer grid with swirl deflectors and hydraulic pressure springs.
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.
Bashkirtsev, Sergey M.; Kuznetsov, Valentin F.; Kevrolev, Valery V.; Morozov, Alexey G., Light-water reactor fuel assembly (alternatives), a light-water reactor, and a fuel element of fuel assembly.
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