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31. 发明专利

JPH02268329A DATA PROCESSOR 失效
公开(公告)号：JPH02268329A
公开(公告)日：1990-11-02
申请号：JP9111389
申请日：1989-04-11
申请人： TOSHIBA CORP
发明人： NAGANO MAMORU
IPC分类号： G06F9/38
摘要： PURPOSE:To surely interrupt the decode stage of a following instruction to perform the efficient pipeline processing at a high speed by discriminating whether data as the processing object exists across plural words. CONSTITUTION:Control information consisting of control information Ca of the address calculation stage, control information Cb of the operand fetch stage, and control information of the second address calculation stage are stored in a control storage 12 correspondingly to instruction codes of various machine language instructions. When processing object data of an instruction N exists across two words, a determining circuit 18 determines a need of second operand access in the address calculation stage following the instruction decode stage of the instruction N based on lower bits of the operand address obtained on th way of calculation of an address calculating circuit 17 and data length and address conditions in information Ca in a control register 13. At this time, selection of information Cc in a register 15 is indicated to a selecting circuit 16, and the instruction decode stage of an instruction N+1 is interrupted for the period of a corresponding cycle.

32. 发明专利

JPH05100066A NUCLEAR FUEL ASSEMBLY 失效
公开(公告)号：JPH05100066A
公开(公告)日：1993-04-23
申请号：JP40708290
申请日：1990-12-26
申请人： TOSHIBA CORP , TOSHIBA ENGINEERING CO
发明人： NAGANO MAMORU , NOGIWA HISAO
IPC分类号： G21C3/326 , G21C3/328
摘要： PURPOSE:To increase the infinite multiplication factor by flattening the output distribution in the axial direction, preventing the deterioration of the scram reactivity characteristic, and increasing the local output peaking of long fuel rods located at the outer periphery section in a nuclear fuel assembly having both long fuel rods and short fuel rods as fuel rods. CONSTITUTION:A fissile material has no enrichment distribution in the axial direction except for both end portions of 6-12 inches at the upper and lower ends for the fuel rods arranged on the outermost periphery among fuel rods 31-34, and the fissile material has enrichment distribution only for the fuel rods arranged on the second layer and inner. The concentration of the combustible poison on the radial cross section of the axial area where the nuclear fuel material quantity is relatively smaller is made relatively lower than the concentration of the combustible poison on the radial cross section of another axial area.

33. 发明专利

JPH0458191A NUCLEAR FUEL ASSEMBLY 失效
公开(公告)号：JPH0458191A
公开(公告)日：1992-02-25
申请号：JP16854290
申请日：1990-06-28
申请人： TOSHIBA CORP , TOSHIBA ENGINEERING CO
发明人： NAGANO MAMORU , NOGIWA HISAO
IPC分类号： G21C3/328 , G21C3/326 , G21C3/62
摘要： PURPOSE:To prevent the deterioration in scram reactivity characteristic and to enhance the safety of a nuclear reactor by incorporating burnable poisons in the quantity relatively larger in the axial direction where the nuclear fuel material quantity is relatively large than in the other axial regions. CONSTITUTION:The burnable poisons are incorporated in the region where the nuclear fuel material quantity is large in the quantity larger than the quantity at the point where the nuclear fuel material quantity is small even if the region where the nuclear fuel material quantity is large and the region where the nuclear fuel material quantity is small are generated in the axial direction by incorporating short-sized fuel rods P therein or even if the region where a coolant passage area is small and the region where this area is large are generated in correspondence thereto. Therefore the difference in the output density in the axial direction by the difference in the nuclear fuel material quantity and the coolant passage area is, therefore, offset and the flat output density distribution in the axial direction is obtd. The deterioration in the reactivity characteristic of the control rods inserted from below to the axial direction of the fuel rods is prevented in this way in any cycle of the operation cycles.

34. 发明专利

JPH03251794A INITIALLY CHARGED CORE OF NUCLEAR REACTOR 失效
公开(公告)号：JPH03251794A
公开(公告)日：1991-11-11
申请号：JP4824690
申请日：1990-02-28
申请人： TOSHIBA CORP
发明人： NAGANO MAMORU , HIDA KAZUTAKA
IPC分类号： G21C5/00
摘要： PURPOSE:To intend to increase fully a burn-up-at-bringing-out of initially charged fuels by using two kinds of fuel assemblies consisting of natural uranium fuels or enriched uranium fuels, and by specifying an arrangement of the natural uranium fuels. CONSTITUTION:Two kinds of fuel assemblies, a fuel assembly (type I) charged with a natural uranium and another fuel assembly (type II) charged with an enriched uranium, are arranged as shown by the figure. A part of the type I assemblies are arranged at positions surrounding control rods which are inserted into a reactor core for reactivity regulation or regulation of power distribution during on-power operation. In this an initially charged core, since only type I assemblies are brought out after the first cycle is finished, an amount of residual uranium 235 in the brought-out assemblies can be reduced substantially compared to a conventional one, and a rate of refuelling can be also reduced. Consequently, an in-core staying time of the initially charged fuels and a fuel burn-up can be increased and a fuel economy can be intended to be improved.

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