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公开(公告)号：US5089210A
公开(公告)日：1992-02-18
申请号：US492514
申请日：1990-03-12
CPC分类号： G21C3/326 , G21Y2002/201 , G21Y2002/302 , G21Y2002/304 , G21Y2004/30 , Y02E30/31 , Y02E30/38
摘要： The present invention relates to nuclear reactors and more specifically to a fuel bundle arrangement for a boiling water nuclear reactor in which so-called mixed oxide fuels including plutonium and uranium are utilized in a nuclear fuel bundle together with a burnable absorber such as gadolinium to optimize the reaction of a nuclear fuel bundle.
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公开(公告)号：USRE33818E
公开(公告)日：1992-02-11
申请号：US534812
申请日：1990-06-06
CPC分类号： G21C3/324 , G21C3/322 , G21Y2002/201 , G21Y2004/30 , G21Y2004/305 , Y02E30/40
摘要： An improved channel is disclosed which has a reduced average thickness in its upper portion. The lesser average thickness corresponds to a lower pressure difference acting on the channel sides, over the upper portion of the channel. The reduction in average thickness is accomplished by cutting flow trippers into the inner surface of the channel walls and/or cutting grooves into the outer surface of the channel. The axial variation of channel average thickness increases water volume adjacent to the upper part of the channel to provide increased neutron moderation, to minimize the steam void reactivity coefficient, and to provide a greater cold shutdown margin. The material removed to produce the flow trippers increases the cross-sectional area inside the channel and reduces pressure drop in the upper portion of the channel. The flow trippers divert water flowing on the channel walls to the fuel rods adjacent to the channel walls, permitting higher reactor power operation. The flow trippers also permit operation at lower flow rates.
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