公开(公告)号：US5267291A

公开(公告)日：1993-11-30

申请号：US838999

申请日：1992-02-21

申请人： Bruce Matzner ,  James E. Wood

发明人： Bruce Matzner ,  James E. Wood

IPC分类号： G21C3/33 ,  G21C3/332 ,  G21C3/34

CPC分类号： G21C3/332 ,  G21C3/33 ,  G21C3/34 ,  G21Y2002/201 ,  G21Y2004/30 ,  Y02E30/40

摘要： In a fuel bundle for a boiling water nuclear reactor, modification of the spacers at the peripheral spacer band is made to maintain a more uniform spacing of the peripheral fuel rods from the channel walls to avoid critical power limitations. The conventional fuel bundle construction include a plurality of side-by-side sealed vertically disposed nuclear fuel rods in a square array supported at a lower tie plate, at least some of the fuel rods fastened to an upper tie plate, and held in designed spaced apart relation as a unitary mass by intermittent vertically placed spacers. A square sectioned channel surrounds the upper tie plate, the lower tie plate, and the fuel rods and spacers therebetween. The square sectioned channel functions to confined fluid flow interior of the fuel bundle between the tie plates and through the fuel rods. At the same time, the channel separates a core bypass region exterior of the channel having high moderator density from the flow path interior of the fuel bundle. The spacers are modified at their peripheral band to prevent the spacer confined group of fuel rods closing on the channel wall due to overall migration of the fuel rods as a group held together by the spacers. According to the invention, two adjacent spacer sides are formed with at least two protrusions--typically in the form of bubble like projections, these protrusions occupying the entire interval necessary to maintain the fuel rods adjacent the sides at their full optimal spacing from the interior channel walls. Similarly, the remaining two adjacent spacer sides are formed with protrusions--again in the form of bubble like projections, these protrusions occupying a sufficient interval to prevent inadvertent closing of the fuel rods to the channel sides beyond a worst case limit. This worst case limit is chosen to provide the peripheral fuel rods with adequate clearance to avoid critical power limitation and yet leave sufficient clearance between the peripheral band and the channel so that the channel may be conveniently assembled to the fuel bundle. On these two remaining sides of the peripheral spacer band, leaf springs are added. These leaf springs are preferably vertical in their longitudinal dimension, fastened to the band at one end, bulged outwardly toward the channel in the middle, and bent inwardly and bearing in sliding relation on the band at the opposite end. In operation, the leaf springs are given sufficient force to bias the fuel rod matrix at the spacer away from the channel wall. Such biasing registers the full dimension protrusions to the channel wall at the opposite sides of the spacer and uniformly spaces the peripheral fuel rods with respect to the channel. Bundle critical power is enhanced.

公开(公告)号：US5251246A

公开(公告)日：1993-10-05

申请号：US1928

申请日：1993-01-08

申请人： Bruce Matzner

发明人： Bruce Matzner

IPC分类号： G21C3/322

CPC分类号： G21C3/322 ,  Y02E30/38

摘要： A water rod is disclosed in combination with a fuel bundle for a boiling water nuclear reactor in which water is introduced to the water rod directly from the high pressure lower plenum below the reactor core. This introduced water circulates upwardly and centrally through the water rod to the top of the water rod. Thereafter, the water flows peripherally downward adjacent the exterior of the water rod. The introduction of water to the water rod directly from the high pressure water plenum below the reactor core provides sufficient pressure to maintain water flow through the water rod and to prevent flashing of the water passing through the circuitous path of the water rod to steam. Thereafter, the water is discharged at the bottom of the fuel bundle with water entering the steam generation path through the lower tie plate so that the discharged water participates in the steam generating flow path within the fuel bundle. Shunting of the water flow with the accompanying thermal hydraulic inefficiencies is avoided.

摘要翻译： 公开了一种水杆，用于沸水核反应堆的燃料束，其中水直接从反应堆堆芯下方的高压下部通风室引入水杆。 这种引入的水向上和中心地循环通过水杆到水杆的顶部。 此后，水围绕水杆的外部周向流动。 将水直接从反应堆堆芯下方的高压水室引入水中提供了足够的压力，以保持水流过水杆并防止水通过水杆的迂回路径闪蒸到蒸汽。 此后，水通过下连接板进入蒸汽发生路径的燃料束的底部排出，使得排出的水参与燃料束内的蒸汽发生流路。 避免了伴随的热液压低效率的水流分流。

公开(公告)号：US4587704A

公开(公告)日：1986-05-13

申请号：US607745

申请日：1984-05-07

申请人： Bruce Matzner ,  Victor M. Horn ,  Michael V. Curulla ,  John F. Price

发明人： Bruce Matzner ,  Victor M. Horn ,  Michael V. Curulla ,  John F. Price

IPC分类号： G21C3/344 ,  B23P11/02

CPC分类号： G21C3/344 ,  Y02E30/40 ,  Y10T29/49863 ,  Y10T29/49947

摘要： In a fuel assembly for a nuclear reactor a fuel element spacer formed of an array of laterally positioned cojoined tubular ferrules each providing a passage for one of the fuel elements, the elements being laterally supported in the ferrules between slender spring members and laterally oriented rigid stops.

摘要翻译： 在用于核反应堆的燃料组件中，燃料元件间隔件由横向定位的相配合的管状套圈阵列形成，每个套管均为一个燃料元件提供通道，元件横向地支撑在细长弹簧构件和横向定向的刚性挡块之间的套圈中 。

公开(公告)号：US4508679A

公开(公告)日：1985-04-02

申请号：US410124

申请日：1982-08-20

申请人： Bruce Matzner ,  Victor M. Horn ,  Michael V. Curulla ,  John F. Price

发明人： Bruce Matzner ,  Victor M. Horn ,  Michael V. Curulla ,  John F. Price

IPC分类号： G21C3/34 ,  G21C3/344

CPC分类号： G21C3/344 ,  Y02E30/40

摘要： In a fuel assembly for a nuclear reactor a fuel element spacer formed of an array of laterally positioned cojoined tubular ferrules each providing a passage for one of the fuel elements, the elements being laterally supported in the ferrules between slender spring members and laterally oriented rigid stops.

摘要翻译： 在用于核反应堆的燃料组件中，燃料元件间隔件由横向定位的相配合的管状套圈阵列形成，每个套管均为一个燃料元件提供通道，元件横向地支撑在细长弹簧构件和横向定向的刚性挡块之间的套圈中 。