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1. 发明专利

JPH09304572A FUEL CHARGING METHOD 失效
公开(公告)号：JPH09304572A
公开(公告)日：1997-11-28
申请号：JP12434996
申请日：1996-05-20
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAKAMURA MITSUYA , HAIKAWA KATSUMASA , YAMANAKA AKIHIRO , KANDA AKIKO , MOCHIDA TAKAAKI , YAMASHITA JUNICHI , TANABE SHIGETADA , KIRIHARA SHINICHI
IPC分类号： G21C5/00 , G21C5/12 , G21C5/18 , G21C7/00 , G21C19/19 , G21C19/20
摘要： PROBLEM TO BE SOLVED: To increase of the taken-out burn-up degree of initially charged fuel and reduce the exchange number of exchange fuel by taking out fuel assemblies of higher average enrichment than the fuel assemblies at the time of initial charge after burning them for three cycles, and furthermore, charging them in a reactor core again after passing one cycle or more. SOLUTION: A nuclear reactor is operated without any exchange of fuel up to the second cycle, and low enrichment fuel 5 is exchanged after the second or third cycle completion. Higher average enrichment fuel 6 than exchange fuel is taken out after three cycle completion, and charged again after fifth cycle completion. Low enrichment fuel constitution of a reactor core charges the low enrichment fuel 5 in the outmost layer of the reactor core and a control cell 10, and the high enrichment fuel 6 is charged in an area except for it. The control cell 0 is constituted of four fuel assemblies surrounding control rods inserted in the reactor core during operation of the reactor. Thus, the fuel assemblies of high reactivity are set in the center part of the reactor core, those of low reactivity are disposed in the circumferential part to prevent leakage of neutrons from the reactor core, and the reactivity of the reactor is heightened to reduce the number of exchange fuel bodies.

2. 发明专利

JPH09292481A FUEL CHARGE METHOD AND REACTOR CORE 失效
公开(公告)号：JPH09292481A
公开(公告)日：1997-11-11
申请号：JP10683196
申请日：1996-04-26
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MOCHIDA TAKAAKI , SETO TAKEHIRO , TANABE SHIGETADA , KIRIHARA SHINICHI , YAMANAKA AKIHIRO , KANDA AKIKO , HAIKAWA KATSUMASA , YAMASHITA JUNICHI
IPC分类号： G21C5/00 , G21C3/30 , G21C3/324 , G21C3/62 , G21C5/12
摘要： PROBLEM TO BE SOLVED: To increase taken-out burn-up, even when an average enrichment of initial charge has been enhanced. SOLUTION: Low enrichment fuel is charged to an outermost layer and peripheral Gd fuel is charged to initial reactor core of a third layer. After completion of one operation cycle, the peripheral Gd fuel of the third layer is moved to the outermost layer, and the low enrichment fuel of the outermost layer is moved to the third layer - the fifth layer. After a second operation cycle completion, the peripheral Gd fuel of the outermost layer is moved to the third layer, and the low enrichment fuel which was moved to the third layer - the fifth layer is transferred to the outermost layer, and fuel exchange is performed.

3. 发明专利

JPH09304576A FUEL ASSEMBLY LOADING CONFIRMATION DEVICE 失效
公开(公告)号：JPH09304576A
公开(公告)日：1997-11-28
申请号：JP12305596
申请日：1996-05-17
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TANABE SHIGETADA , SHIRAGAMI HISASHI , OKUDA SHINICHI
IPC分类号： G21C3/30 , G21C17/06
摘要： PROBLEM TO BE SOLVED: To provide a device for confirming the normal state arrangement of fuel loading position, direction and the appearance of fuel by analyzing a plurality of fuel assembly images using an operation processor for efficiently and surely performing the loading of fuel assemblies for nuclear power generation in a nuclear power station and a fuel storage facility. SOLUTION: A photographing device 1, a floodlight 2 and a floodlight angle controller 3 are placed in a moving device 4. The moving device 4 is controlled by a controller 5. The photographing elevation of the photographing device is controlled at the elevation capable of photographing the number of recognizable fuel assemblies according to the resolution of the photographing device 1. At the same time, the moving coordinates in photographing are moved to control so as not to duplicate the photographed fuel. The controller 5 fixed to the moving device 4 is connected with transmission cables 6 and 9 to a fuel loading confirmation analyzer 8, and transmits and receives the photographed signal of the fuel assemblies, the operation signal of the moving device and the projection angle controlling signal of the floodlight.

4. 发明专利

JPH03246490A METHOD AND DEVICE FOR NUCLEAR REACTOR OUTPUT CONTROL 失效
公开(公告)号：JPH03246490A
公开(公告)日：1991-11-01
申请号：JP4246990
申请日：1990-02-26
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YOSHIMOTO YUICHIRO , SHIMOJU TAKANORI , FUKAHORI TAKANORI , NAKAMURA MITSUYA , SUZUKI SHUJI , TANABE SHIGETADA
IPC分类号： G21C7/08 , G21C17/10 , G21D3/04
摘要： PURPOSE:To increase the margin of stability of a reactor core by inserting a 1st selection control rod into the reactor core partially and also inserting a 2nd selection control rod which is different from the 1st selection control rod into the reactor core completely. CONSTITUTION:The selection control rod insertion signal outputted by a selec tion control rod insertion signal generating means 12 and X-Y coordinate values of respective selection control rods which are outputted by a selection control rod setting means 15 are inputted to a selection control rod control means 18. The means 18 outputs a driving signal for inserting the control rod 3B completely to a control rod driving device 4 coupled with the selection control rod 3B and a driving signal for inserting the control rod 3A partially to a driving device 4 coupled with the selection control rod 3A. Consequently, the control rod 3B is inserted completely after the control rod 3A is inserted par tially. Namely, the control rod 3A is inserted partially into the reactor core 2, i.e. between fuel assemblies within a range of 12.5 - 50% of the overall axial length of the neutron absorber the control rod about area of the control rod from the insertion side end of the area.

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