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41. 发明专利

JPS5494414A METHOD OF HOTTFORMING POLYGONAL PIPE 失效
公开(公告)号：JPS5494414A
公开(公告)日：1979-07-26
申请号：JP115278
申请日：1978-01-11
申请人： HITACHI LTD
发明人： SUZUMURA TAKESHI , SAITOU SOUZOU
IPC分类号： C21D9/50 , C21D1/26 , C21D9/08
摘要： PURPOSE:To prevent the generation of defects on cold-worked polygonal pipes along with a proper control of the dimension and shape of the heat treated pipe by applying the difference in the expansion coefficient between a foil of material identical to the pipe and a core tool of greater expansion coefficient which both are arranged thereinside in heat-treating the pipe for stress removal. CONSTITUTION:Inside a pipe 1 to be heat-treated, a foil-like sheet made of material identical in quality or expansion coefficient identical to the pipe 1 is provided and in such manner that one end thereof is connected to the other end along te axis of thereof. A core tool 3 made of material of greater expansion coefficient than the pipe is inserted into the pipe 1 and the sheet 2. A pin 4 is run trough a hole 5 on the pipe 1 and screwed down into the core tool 3. The core tool 3 is put to the sheet 2 at the corner section while the corner section of the pipe 1 is expanded to a high temperature finish size and then fixed. The pipe is retained for a long period of time under such a condition. In this manner, it is finished into a polygonal pipe with a desired shape and size free from defect at a high accuracy.

42. 发明专利

JPS53141884A CHANNEL BOX 失效
公开(公告)号：JPS53141884A
公开(公告)日：1978-12-11
申请号：JP5537577
申请日：1977-05-16
申请人： HITACHI LTD
发明人： SUZUMURA TAKESHI , SUZUKI TOSHIO , SAITOU SOUZOU , HIRAKAWA HIROMASA
IPC分类号： G21C3/324 , G21C3/32
摘要： PURPOSE:To obtain a channel box of fuel assembly having a suitable anti-deformation construction against a horizontal force by providing a concave section which protrudes into the inside of channel box in opposition to control rod roller position.

43. 发明专利

JPS52102986A FUEL ASSEMBLY 失效
公开(公告)号：JPS52102986A
公开(公告)日：1977-08-29
申请号：JP1845076
申请日：1976-02-24
申请人： HITACHI LTD
发明人： SHIRASAKI KIYOTAKA , SUZUMURA TAKESHI , SAITOU SOUZOU , KAWAHARA AKIRA , HIRAKAWA HIROMASA
IPC分类号： G21C3/33 , G21C3/14 , G21C3/32
摘要： PURPOSE:A structure capable of preventing the deformation of a fuel assembly especially a channel box at min.

44. 发明专利

JPS51151496A MEASURING PIPE INSIDE THE REACTOR 失效
公开(公告)号：JPS51151496A
公开(公告)日：1976-12-25
申请号：JP7442475
申请日：1975-06-20
申请人： HITACHI LTD
发明人： SUZUMURA TAKESHI , SAITOU SOUZOU , YASUDA TETSUO , SHIRASAKI KIYOTAKA
IPC分类号： G21C17/10
摘要： PURPOSE:The device is to fix plural numbers plate springs on the outer circumference in order to prevent vibration due coolant flow and also to prevent mechanical damages on the channel box.

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